Calamus centralis A.J.Hend., N.K.Ban & N.Q.Dung, Palms (1999+) 52(4). 2008

Primary tabs

no image available

Distribution

Map uses TDWG level 3 distributions (http://www.nhm.ac.uk/hosted_sites/tdwg/geogrphy.html)
Vietnam
Central Vietnam in Nghe An and Ninh Binh, in lowland forest on limestone soils. (Henderson, A.J., Ban, N.K. & Dung, N.Q., New species of Calamus (Palmae) from Vietnam in Palms (1999+) 52(4). 2008)A

Discussion

  • The specimens cited here will key to Calamus palustris Griff. in Evans et al. (2002). Calamus centralis and C. palustris occur together in central Vietnam, and are most easily distinguished by the more slender stems of C. centralis (stems 0.8-1 cm diameter versus stems to 5 cm diameter), its fewer (3-7 versus 12-25) pinnae, shorter (to 1 cm long versus to 3.5 cm long) staminate rachillae, and shorter (1-2 cm long versus to 6 cm long) pistillate rachillae. By its climbing habit, eflagellate sheaths, cirrate leaves, eflagellate inflorescences, tubular partial inflorescence bracts, Calamus centralis appears to be a member of Beccari's (1908) Group XV. (Henderson, A.J., Ban, N.K. & Dung, N.Q., New species of Calamus (Palmae) from Vietnam in Palms (1999+) 52(4). 2008)A

Common Name

  • May, may mat. (Henderson, A.J., Ban, N.K. & Dung, N.Q., New species of Calamus (Palmae) from Vietnam in Palms (1999+) 52(4). 2008)A

Description

  • Stems clustered, climbing, to 20 m long, 0.8-1 cm diameter with sheaths. Leaf sheaths closed and tubular, green, without tomentum or with mottled brown tomentum, with few, scattered, yellowish-green or brown, flattened spines to 2 cm long, sometimes shorter spines interspersed; ocreas obscure, membranous; knees prominent; flagella absent; petioles absent or 2-3 cm long; rachis 38-82 cm long, with solitary or paired, recurved spines abaxially; cirri 40-76 cm long; pinnae 3-7 per side of rachis, 10-27 cm long, 1-4.5 cm wide at the middle, linear-lanceolate, distantly and irregularly arranged, the basal pair swept back across the sheath, minutely bristly along the margins with longer bristles at the apices, the veins not bristly. Staminate inflorescences to 36 cm long, erect or arching, not flagellate, branched to 2 orders, with 5-10 partial inflorescences; prophylls 1-5 cm long; partial inflorescence bracts tubular, not splitting laterally, with a prominent lobe at the apex; rachillae 1-10, to 1 cm long; rachillae bracts 1 mm high, apiculate, ciliate; floral bracteoles cupular, 2-lobed; staminate flowers 5 mm long; calyx tubular, 3 mm long, split for about half its length into 3 lobes; corolla 5 mm long, split almost to the base into 3 valvate petals; stamens 6; filaments inflexed at the apices; pistillode minute; pistillate inflorescences 28-30 cm long, erect, not flagellate, branched to 2 orders, with 4-5 partial inflorescences; prophylls 4 cm long; partial inflorescence bracts tubular, not splitting laterally; rachillae 4-6, 1-2 cm long; rachillae bracts 2 mm high, apiculate, ciliate; floral bracteoles cupular, 2-lobed; pistillate flowers 4.5 mm long; calyx 4.5 mm long, briefly 3-lobed at the apices; corolla 4 mm long, split for about half its length into 3 valvate petals; staminodes 6, the filaments cupular; fruits not known. (Henderson, A.J., Ban, N.K. & Dung, N.Q., New species of Calamus (Palmae) from Vietnam in Palms (1999+) 52(4). 2008)A

Materials Examined

  • Vietnam. Nghe An: Pu Huong Nature Reserve, 19°19'N, 105°03'E, ca. 200 m, 8 May 2007, A. Henderson, Bui Van Thanh, Tran Duc Dung, Chu Van Dai, & Vu Ba Hung 3352 (Holotypus: HN! Isotypi: K! NY!).

    Vietnam. Ninh Binh: Nho Quan District, Cuc Phuong National Park, trail near Bong, 20°35'N, 105°60'E, ca. 300 m, 5 May 2007, Henderson et al. 3334 (HN, NY). NGHE AN: Pu Huong Nature Reserve, 19°18'N, 105°07'E, ca. 250 m, 7 May 2007, Henderson et al. 3347 (HN, NY); Pu Huong Nature Reserve, 19°19'N, 105°03'E, ca. 200 m, 8 May 2007, Henderson et al. 3352 (HN, NY); Pu Huong Nature Reserve, Cuom Village, 19°24'N, 104°58'E, ca. 300 m, 10 May 2007, Henderson et al. 3358 (HN, NY); Pu Mat National Park, road from Con Cuong to Thac Kem, 18°57'N, 104°48'E, ca. 100 m, 12 May 2007, Henderson et al. 3368 (HN, NY); Pu Mat National Park, road from Con Cuong to Thac Kem, 18°57'N, 104°49'E, ca. 100 m, 14 May 2007, Henderson et al. 3373 (HN, NY). Calamus crispus Henderson, N. K. Ban & N. Q. Dung, sp. nov., a Calamo tetradactylo ocreis brevibus, petiolis nullis, pinnis nitidis viridibus ad margines conspicue setosis, apicibus crispatis differt. Typus. Vietnam. Thua Thien-Hue: Bach Ma National Park, ca. 8 km from the summit, 16°13'N, 107°51'E, ca. 530 m, 13 Apr 2007, A. Henderson, Nguyen Quoc Dung, Phan Doan Vong, Phan Quyet, & Le Van Bo 3273 (Holotypus: HN! Isotypi: K! NY!). (Henderson, A.J., Ban, N.K. & Dung, N.Q., New species of Calamus (Palmae) from Vietnam in Palms (1999+) 52(4). 2008)A

Bibliography

    A. Henderson, A.J., Ban, N.K. & Dung, N.Q., New species of Calamus (Palmae) from Vietnam in Palms (1999+) 52(4). 2008