taxonID	type	description	language	source
387AC21DFFB01876FF13FA60449BC186.taxon	description	Until now (Henderson, 2009) one species of Plectocomiopsis was known from Vietnam: Plectocomiopsis geminiflora (Griffith) Beccari in Hooker (1893: 479). During recent field work in central Vietnam, a second species was discovered and is described below.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB01874FF13F96142E2C46C.taxon	description	A Plectocomiopsis geminiflora pinnis glabris et floribus glabris differt.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB01874FF13F96142E2C46C.taxon	materials_examined	Type: — VIETNAM. Quang Nam Province: Nam Giang District, Ta Bhing commune, Song Thanh Nature Reserve, road 14 D to Laos, 15 ˚ 39 ’ N, 107 ˚ 36 ’ E, 412 m, 12 March 2009, A. Henderson, B. V. Thanh, N. T. Vu & C. Tuo 3573 (holotype: HN!, isotypes: AAU! K! NY!).	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB01874FF13F96142E2C46C.taxon	description	Stems clustered, forming large clumps, 20 – 30 m tall, 1.5 – 1.7 cm in diameter with sheaths, triangular in cross – section. Leaf sheaths green or gray-green, with few, scattered, yellowish spines to 5 mm long; knees absent; ocreas to 1 cm long, green, membranous, with few, short spines, becoming brown and splitting irregularly; petioles absent or to 2 cm long; rachis 56 – 87 cm long, with recurved spines abaxially; pinnae 11 – 13 per side of rachis, more or less regularly and distantly arranged; middle pinnae 25 – 27 cm long, 1.5 – 3 cm wide at widest point, lanceolate, with long, filiform apices, with prominent cross – veins, without bristles; cirri 60 – 80 cm long. Inflorescences 9 – 11 at apex of stem, subtended by reduced leaves, branched to 2 orders, pendulous; staminate inflorescences with 19 – 29 rachillae, these 9 – 23 cm long, 1.5 mm in diameter; staminate flowers borne in short, congested rows on opposite sides of rachillae to 1 cm long; staminate flowers globose in bud, 1.2 mm long (immature); sepals glabrous, 1 mm long; petals 3, free, valvate, glabrous, 1 mm long; pistillate inflorescences with 11 rachillae, these 7 – 12 cm long, 2.5 mm in diameter; pistillate flowers paired on very short rachillae subtended by a cupular bracteole; pistillate flowers not seen; fruits depressed – globose, 1.6 – 1.8 cm in diameter, brownish – green; endosperm homogeneous.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB01874FF13F96142E2C46C.taxon	distribution	Distribution and habitat: — Endemic to central Vietnam in Quang Nam and Thua Thien-Hue Provinces, in disturbed places by roads or in disturbed areas in forest.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB01874FF13F96142E2C46C.taxon	vernacular_names	Local names and uses: — may phun, may rut. The cane is of poor quality and is collected only for domestic uses.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB01874FF13F96142E2C46C.taxon	materials_examined	Additional specimens examined (paratypes): — VIETNAM. Thua Thien-Hue: Bach Ma National Park, 16 ° 14 ’ N, 107 ° 52 ’ E, ca. 100 m, 14 April 2007, Henderson et al. 3277 (HN, NY). Quang Nam: Nam Giang district, 17 October 2005, N. K. Ban PA 167 (HN); Nam Giang District, Ta Bhing commune, Song Thanh Nature Reserve, road 14 D to Laos, 15 ˚ 39 ’ N, 107 ˚ 36 ’ E, 412 m, 12 March 2009, Henderson et al. 3571 (AAU, HN, K, NY); 3572 (AAU, HN, K, NY); 14 Mar 2009, 3577 (AAU, HN, K, NY); 3581 (HN, K, NY); Ho Chi Minh Highway between Thanh My and Prao, 15 ˚ 48 ’ N, 107 ˚ 45 ’ E, 294 m, 19 March 2009, Henderson et al. 3594 (HN, NY).	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB01874FF13F96142E2C46C.taxon	discussion	Discussion: — Plectocomiopsis songthanhensis (named for the Song Thanh Nature Reserve) differs from P. geminiflora in its pinnae without bristles (versus pinnae with conspicuous bristles along adaxial mid – veins and margins); short, entire, non-tattering ocreas (versus elongate, tattering ocreas); petioles without marginal spines (versus petioles with marginal spines); staminate calyces split to the base into 3, free sepals (versus staminate calyces cupular, briefly and irregularly 3 – lobed); and glabrous staminate and pistillate perianths (versus staminate and pistillate perianths usually covered with scale – like trichomes).	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB01874FF13F96142E2C46C.taxon	distribution	The distributions of the two species do not overlap. Plectocomiopsis songthanhensis is known only from central Vietnam in Quang Nam and Thua Thien – Hue Provinces. In Vietnam, P. geminiflora is known only from southern part of the country, in Dong Nai and Lam Dong Provinces, although it is widely distributed elsewhere (Cambodia, Laos, Myanmar, Thailand, Borneo, Peninsular Malaysia, and Sumatra). Three specimens of Plectocomiopsis at K (Khamphone 393, 409, Sounthone 22) from Laos occur relatively near to the population of P. songthanhensis. Although all three specimens are sterile, they share bristly pinnae, tattering ocreas, and spiny petioles, and are identified as P. geminiflora (Evans et al. 2002).	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB21874FF16FC034570C3E9.taxon	description	Calamus fissilis Henderson et al. (2008: 192) and C. nuichuaensis Henderson et al. (2008: 196) were based on incomplete specimens. Recently we have collected more complete specimens of both species. These have the inflorescence rachis bracts splitting to the base and becoming deciduous, and fruits with ruminate endosperm. These two character states are not found in Calamus, but are common in Daemonorops, and therefore we transfer both these species to Daemonorops. Based on the deciduous, splitting rachis bracts, the two species appear to belong to section Piptoshatha Beccari (1911: 27).	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB21874FF16FA8146F3C167.taxon	materials_examined	Type: — VIETNAM. Thua Thien-Hue: Bach Ma National Park, 16 ° 14 ’ N, 107 ° 52 ’ E, 100 m, 12 April 2007, A. Henderson, N. Q. Dung, P. X. Phuong, & L. V. Bo 3266 (holotype: HN!, isotypes: K! NY!). Additional material studied: — VIETNAM: Da Nang City, Hoa Vang District, Ba Na-Nui Chua Nature Reserve, steep forested slopes, 16 ° 00 ’ N, 108 ° 01 ’ E, ca. 800 m, 4 Jun 2009, Henderson & N. K. Ban 3596 (HN, NY).	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB21875FF16F93C4723C663.taxon	materials_examined	Type: — VIETNAM. Ninh Thuan: Ninh Hai District, Nui Chua National Park, near summit of mountain, forest on rocky slopes, 11 ° 48 ’ N, 109 ° 10 ’ E, ca. 800 m, 27 July 2007, A. Henderson, N. K. Ban, & A R. Cui 3468 (holotype: HN!, isotypes: K! NY!). Additional material studied: — VIETNAM. Ninh Thuan Province: Ninh Hai District, Nui Chua National Park, 11.80 N, 109.16 E, ca. 800 m, 26 Oct 2009, Henderson et al. 3646 (HN, NY). The transfer of these two species brings the number of Daemonorops in Vietnam to five: D. jenkinsiana (Griffith) Martius (1853: 327), D. poilanei Dransfield (2001: 663), D. mollispina Dransfield (2001: 662), D. fissilis and D. nuichuaensis. All but D. jenkinsiana are endemic to Vietnam and belong to section Piptospatha. Recent field work revealed another two species new to science, making a total of seven Daemonorops for Vietnam.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB31872FF16FE3846FDC5AD.taxon	description	A speciebus aliis Daemonorops habitu non scandenti et foliis non cirratis differt.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB31872FF16FE3846FDC5AD.taxon	materials_examined	Type: — VIETNAM. Khanh Hoa Province: Khanh Vinh District, Khanh Trung Commune, Suoi Ca Village, 400 m, 21 May 2007, N. Q. Dung 2003 (holotype: FIPI!, isotype: NY!).	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB31872FF16FE3846FDC5AD.taxon	description	Stems solitary, non-climbing, free-standing, green, to 0.5 m long, 3 cm in diameter without sheaths. Leaves 7; sheaths brownish-green, open, with scattered, yellowish spines to 11 cm long; ocreas to 4 cm long, not spiny; knees absent; petioles to 60 cm long, spiny as the sheaths; rachis to 310 cm long, with scattered, solitary spines abaxially to 3.5 cm long; cirri absent; pinnae to 34 per side of rachis, to 51.5 cm long, 4 cm wide at the middle, linear – lanceolate, regularly arranged, spreading in the same plane, without bristles. Staminate inflorescences to 1.2 m long, erect, not flagellate, branched to 2 orders, with to 20 partial inflorescences; prophylls not seen; partial inflorescence bracts tubular, splitting laterally and early deciduous, without spines or the distal ones with few spines; rachillae 1 – 13 per partial inflorescence, 0.5 – 2 cm long; rachillae bracts 6 mm high; floral bracteoles cupular; staminate flowers 7 mm long; calyx cupular, 3 mm long, briefly 3 – lobed; corolla 6 mm long, split to the base into 3 valvate petals; stamens 6; filaments 2.5 mm long, inflexed at their apices for 0.5 mm; pistillodes well – developed, 1.5 mm long; pistillate inflorescences shorter than the staminate, branched to 1 order, with 3 partial inflorescences; prophylls not seen; partial inflorescence bracts tubular, splitting laterally and becoming deciduous, without spines on outer surfaces; rachilla 1 per partial inflorescence, 4 – 10 cm long; pistillate flowers 11 mm long; calyx 6 mm long, cupular, briefly 3 - lobed at the apex; corolla 10 mm long, tubular below for 3 mm, free above into 3, valvate petals; staminodes 6, well – developed; fruits ellipsoid, brown, 3.5 cm long, 2.5 cm in diameter.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB31872FF16FE3846FDC5AD.taxon	distribution	Distribution and habitat: — Endemic to southern Vietnam in Khanh Hoa Province in primary evergreen forest at 400 m elevation.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB31872FF16FE3846FDC5AD.taxon	vernacular_names	Local names and uses: — may dat. No uses recorded.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB31872FF16FE3846FDC5AD.taxon	discussion	Discussion: — Daemonorops brevicaulis (named for its short stems) belongs to section Piptospatha of Daemonorops, which in Vietnam includes all species except D. jenkinsiana. It differs from these in a combination of its non – climbing habit, lack of cirri, unbranched partial pistillate inflorescences, and larger fruits.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB41872FF16FD424439C07C.taxon	description	A speciebus aliis Daemonorops ocreis prominentibus et pinnis sin setosis differt.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB41872FF16FD424439C07C.taxon	materials_examined	Type: — VIETNAM. Khanh Hoa Province: Khanh Vinh District, Khanh Trung Commune, Suoi Ca Village, 400 m, 21 May 2007, N. Q. Dung 2006 (holotype: FIPI!, isotype: NY!).	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB41872FF16FD424439C07C.taxon	description	Stems clustered, climbing, to 12 m long, 3.2 cm diam. with sheaths. Leaf sheaths closed, brown with early deciduous whitish tomentum, densely covered with yellowish – brown spines to 6.5 cm long, interspersed with many smaller spines; ocreas to 10 cm long, brown, with fewer spines, these distally only; knees present, obscured by spines; petioles to 60 cm long, spiny on all sides; rachis to 190 cm long, with scattered, recurved spines abaxially; cirri present, to 70 cm long; pinnae ca. 34 per side of rachis, the middle ones to 44 cm long, 2.5 cm wide at the middle, linear, regularly arranged, spreading in the same plane, bristly along the margins. Staminate inflorescences to 55 cm long, erect, branched to 2 orders, with 7 partial inflorescences; prophylls to 18 cm long, covered with rows of yellowish spines; partial inflorescence bracts tubular, without spines, splitting laterally and falling; rachillae 3 – 5 per partial inflorescence, 2 – 4 cm long; staminate flowers not seen; pistillate inflorescences ca. 30 cm long, erect, branched to 3 orders, with 5 – 6 partial inflorescences; prophylls to 17 cm long, covered with rows of yellowish spines; partial inflorescence bracts tubular, splitting laterally, not spiny; rachillae 1 – 3 per partial inflorescence, 1.5 – 2.5 cm long, subtended by shallowly cupular bracts with 3 – 4 mm long apiculate margins; pistillate flowers not seen; fruits globose, yellowish, ca. 1.7 cm diam., the scales deeply channeled; endosperm ruminate.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB41872FF16FD424439C07C.taxon	distribution	Distribution and habitat: — Endemic to southern Vietnam in Khanh Hoa Province, in primary evergreen forest at 400 – 500 m elevation.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB41872FF16FD424439C07C.taxon	vernacular_names	Local names and uses: — may gia. The stems are collected and reported to be of the same, medium quality as Daemonorops poilanei.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB41872FF16FD424439C07C.taxon	discussion	Discussion: — Daemonorops ocreata (named for its conspicuous ocreas) also belongs to section Piptospatha of Daemonorops. It differs from D. fissilis in its much larger size; from D. nuichuaensis in its climbing habit; from D. mollispina in its conspicuous ocreas, lack of woolly indumentum on the leaf sheath spines, lack of bristles on the adaxial pinnae surfaces, and lack of conspicuous bracts subtending the pistillate rachillae; and from D. poilanei in its conspicuous ocreas, lack of bristles on the adaxial pinnae surfaces, and short, straight pistillate rachillae.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB51873FF16FF0946D2C663.taxon	description	With the transfer of Calamus fissilis and C. nuichuaensis to Daemonorops (see above), there are now 30 currently recognized species of Calamus in Vietnam. Recent field work has revealed the following three new species.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB51870FF16FE3844C5C51B.taxon	description	A Calamo tetradactylo ocreis brevibus, pinnis duos sine setosis, differt.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB51870FF16FE3844C5C51B.taxon	materials_examined	Type: — VIETNAM. Khanh Hoa Province: Khanh Vinh District, Khanh Trung Commune, Suoi Ca Village, 300 – 400 m, 21 May 2007, N. Q. Dung 2005 (holotype: FIPI!, isotype: NY!).	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB51870FF16FE3844C5C51B.taxon	description	Stems clustered, climbing, to 10 m long, 3 mm diam. with sheaths. Leaf sheaths green with scattered brown tomentum, with few, recurved, black-tipped spines to 2 mm long; ocreas scarcely developed, to 3 mm long; knees present; flagella present, to 55 cm long; petioles 2.5 – 3 cm long, spiny abaxially as the sheaths; rachis 14 – 19 cm long, with scattered, solitary or paired spines abaxially; cirri absent; pinnae 2 per side of rachis, the basal ones 11.5 – 14 cm long, 1.7 – 2 cm wide at the middle, linear-lanceolate, without bristles on veins or margins, the apical ones joined proximally for ca. one third their length. Staminate inflorescences to 0.4 m long, arching, flagellate, branched to 2 orders, with 3 – 4 partial inflorescences; prophylls 7 – 9 cm long; partial inflorescence bracts tubular, briefly splitting at the apices, with scattered, recurved spines; rachillae 3 – 11 per partial inflorescence, 0.5 – 2 cm long; staminate flowers 1.5 mm long (immature); calyx 1 mm long, deeply split; corolla 1 mm long, split almost to the base; pistillate inflorescences to 0.25 m long, arching, not flagellate, branched to 2 orders, with 2 partial inflorescences; rachillae 3 – 6, to 1 cm long; pistillate flowers and fruits not seen.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB51870FF16FE3844C5C51B.taxon	distribution	Distribution and habitat: — Endemic to southern Vietnam in Khanh Hoa Province, in primary, evergreen forest at 300 – 400 m elevation.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB51870FF16FE3844C5C51B.taxon	vernacular_names	Local names and uses: — may chi. The stems are used in basketry.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB51870FF16FE3844C5C51B.taxon	discussion	Discussion: — Calamus parvulus (named for its small size) differs from all other Calamus in Vietnam by its extremely slender stems, and leaves with only two pinnae per side of the rachis. It appears most similar to C. tetradactylus Hance (1875: 289) from which it differs in its more slender stems (3 versus 10 mm), scarcely developed ocreas (versus well – developed), fewer pinnae per side of the rachis (2 versus 8 – 13), and pinnae without bristles (versus bristly along the margins).	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB61870FF16FD104353C1A1.taxon	description	A speciebus similibus (Calamus flagellum, C. guruba, C. rhabdocladus, C. rudentum) pinnis 8 – 9 aggretatis in duo catervas distantes differt.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB61870FF16FD104353C1A1.taxon	materials_examined	Type: — VIETNAM. Khanh Hoa Province: Khanh Vinh District, Khanh Trung Commune, Suoi Ca Village, 300 – 400 m, 21 May 2007, N. Q. Dung 2004 (holotype: FIPI!, isotype: NY!).	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB61870FF16FD104353C1A1.taxon	description	Stems clustered, climbing, to 10 m long, 1.8 cm diam. with sheaths. Leaf sheaths closed, green with brown tomentum, densely covered with yellowish spines to 1.5 cm long, those at the sheath apices longer, to 4 cm long, forming rows on either side of sheath apices and petiole bases; ocreas scarcely developed; knees absent; flagella present, to 60 cm long; petioles to 30 cm long, spiny laterally and abaxially as the sheaths; rachis to 42 cm long, with scattered, solitary, recurved spines abaxially; cirri absent; pinnae 8 – 9 per side of rachis, 29 – 35 cm long, 2 – 3 cm wide at the middle, linear – lanceolate, arranged in two distant groups of 5 pinnae distally and 3 – 4 proximally, scarcely bristly along the margins, the apical pair of pinnae joined distally for one third to one half their length. Staminate inflorescences to 0.7 m long, arching, flagellate, branched to 2 orders, with 4 partial inflorescences; prophylls not seen; partial inflorescence bracts tubular, briefly splitting at the apices, without spines; rachillae 5 – 6 per partial inflorescence, 2 – 5 cm long; staminate flowers not seen; pistillate inflorescences not seen; fruits not seen.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB61870FF16FD104353C1A1.taxon	distribution	Distribution and habitat: — Endemic to southern Vietnam in Khanh Hoa Province in primary, evergreen forest at 300 – 400 m elevation.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB61870FF16FD104353C1A1.taxon	vernacular_names	Local names and uses: — may cam. The stems are used in basketry.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB61870FF16FD104353C1A1.taxon	discussion	Discussion: — Calamus seriatus (named for its rows of spines at sheath apices) appears most similar to that group of species having the leaf sheath spines conspicuously longer at the sheath apices (C. flagellum Griffith ex Martius (1853: 333), C. guruba Buchanan-Hamilton in Martius (1838: 211), C. rhabdocladus Burret (1930: 884) and C. rudentum Loureiro (1790: 209 )). It differs from all these in its 8 – 9 pinnae per side of the rachis arranged in two distant groups with the apical pair joined at their bases, versus 27 – 65 pinnae per side of the rachis arranged regularly or sometimes irregularly with the apical pair not joined at their bases.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB6187EFF16F9794491C6B5.taxon	description	A speciebus aliis Calami habitu non scandenti, ocreis prominentibus, pinnis aggregatis, et inflorescentiae flagelliformis differt.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB6187EFF16F9794491C6B5.taxon	materials_examined	Type: — VIETNAM. Quang Ninh Province: Dong Trieu District, Yen Tu Mountain, pagoda area, 21.11 ° N, 106.72 ° E, ca. 100 m, 7 June 2009, A. Henderson & N. Q. Dung 3601 (holotype: FIPI!, isotype: NY!).	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB6187EFF16F9794491C6B5.taxon	description	Stems clustered, non-climbing, free-standing, green, to 1.5 m long, 1.2 cm in diameter without sheaths; internodes 2.5 cm long. Leaves 10 – 12; sheaths open, with rings of black spines to 4.5 cm long, interspersed among many smaller spines; ocreas to 15 cm long, covered with rings of spines as the sheaths, with a tuft of brownish hairs at the apices, becoming split into two ‘ ears’; knees absent; flagella absent; petioles to 50 cm long, spiny on all sides as the sheaths; rachis 50 – 70 cm long, with scattered, solitary spines abaxially; cirri absent; pinnae ca. 43 per side of rachis, 11 – 25 cm long, 0.5 – 1 cm wide at the middle, linear, regularly arranged but with gaps, spreading in the same plane, pendulous at the apices, bristly on main veins and lateral veins adaxially and abaxially and along the margins. Staminate inflorescences to 3 m long, arching, flagellate, branched to 3 orders, with 3 partial inflorescences; prophylls not seen; partial inflorescence bracts tubular, briefly splitting at the apices, without spines; rachillae 1 cm long; rachillae bracts 2 mm high, cupular; floral bracteoles cupular; staminate flowers 3.7 – 4 mm long; calyx tubular, 2 – 2.2 mm long, briefly 3 - lobed; corolla 3 – 3.3 mm long, split almost to the base into 3 valvate petals; stamens 6; filaments inflexed at the apices; pistillodes well – developed, 2.5 mm long; pistillate inflorescences to 3 m long, arching, flagellate, branched to 2 orders, with 3 partial inflorescences; prophylls not seen; partial inflorescence bracts tubular, splitting laterally, with some recurved spines on outer surfaces; rachillae 8 – 9 cm long; rachillae bracts 2.5 cm long; floral bracteoles cupular; pistillate flowers 4.5 mm long; calyx 4 mm long, briefly 3 - lobed at the apex; corolla 3 mm long, briefly 3 - lobed at the apex; staminodes well – developed; fruits globose, brown, ca. 1 cm in diameter; endosperm homogeneous.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB6187EFF16F9794491C6B5.taxon	distribution	Distribution and habitat: — Endemic to northern Vietnam in Quang Ninh Province on Yen Tu Mountain, in disturbed forest at the base of the mountain.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB6187EFF16F9794491C6B5.taxon	vernacular_names	Local names and uses: — may den. The stems are used in furniture making.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB6187EFF16F9794491C6B5.taxon	materials_examined	Additional specimen examined (paratype): — VIETNAM. Quang Ninh Province: Dong Trieu District, Yen Tu Mountain, pagoda area, 21.11 ° N, 106.72 ° E, ca. 100 m, 7 June 2009, A. Henderson & N. Q. Dung 3602 (FIPI, NY).	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
387AC21DFFB6187EFF16F9794491C6B5.taxon	discussion	Discussion: — This unusual species differs from all other non – climbing Calamus in Vietnam and adjacent China, by its elaborate ocreas, interruptedly pinnate leaves, and elongate, flagellate inflorescences. It is named for Yen Tu Mountain, its only known locality.	en	Henderson, Andrew, Dung, Nguyen Quoc (2010): Notes on rattans (Arecaceae) from Vietnam. Phytotaxa 8: 25-33, DOI: 10.11646/phytotaxa.8.1.2
