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

Primary tabs

no image available

Content

Distribution

Central Vietnam in Thua Thien-Hue and near Da Nang City, in Bach Ma National Park and Ba Na-Nui Chua Nature Reserve, on steep slopes in lowland rain forest at 500-800 m elevation. (Henderson, A.J., Ban, N.K. & Dung, N.Q. 2008: New species of Calamus (Palmae) from Vietnam. – Palms; Journal of the International Palm Society 52(4): 187-197)A

Discussion

  • In Evans et al. (2002) the specimens cited here will key to C. tetradactylus Hance. In Bach Ma National Park, where Calamus crispus and C. tetradactylus are sympatric, C. crispus differs most obviously from C. tetradactylus in its very short (versus well-developed) ocreas, lack of a petiole (versus well-developed petioles), basal pair of pinnae swept back across the sheath (versus not swept back), and glossy green pinnae with conspicuously bristly margins and curled apices (versus green pinnae without conspicuously bristly margins and curled apices).

    By its climbing habit, flagellate sheaths, ecirrate leaves, flagellate inflorescences, tubular inflorescences bracts, and non-pedicellate floral bracteoles, Calamus crispus appears to belong to Beccari's (1908) Group V. (Henderson, A.J., Ban, N.K. & Dung, N.Q. 2008: New species of Calamus (Palmae) from Vietnam. – Palms; Journal of the International Palm Society 52(4): 187-197)A

Common Name

  • May tat, may tom. (Henderson, A.J., Ban, N.K. & Dung, N.Q. 2008: New species of Calamus (Palmae) from Vietnam. – Palms; Journal of the International Palm Society 52(4): 187-197)A

Description

  • Stems clustered, climbing, to 10 m tall, 1.5-1.8 cm diameter with sheaths. Leaf sheaths closed and tubular, green with brown tomentum, with scattered, green, downward-pointing spines to 1 cm long, with crescent-shaped, concave bases; ocreas 1 mm long; knees present; flagella 120 cm long; petioles absent on older plants; rachis 28-35 cm long, with solitary or paired, recurved spines marginally and abaxially; cirri absent; pinnae 9-10 per side of rachis, 9.5-14 cm long, 1-3 cm wide at the middle, broadly lanceolate, clustered in remote groups of 2 or 3 pinnae and spreading in different planes, glossy green, curled over at the apices, the basal pair of pinnae swept back across the sheath, the apical pair of pinnae joined for more than half their length, with conspicuous, yellow bristles along the margins, the veins not bristly. Staminate inflorescences 90-130 cm long, arching, not flagellate, with 8 partial inflorescences; prophylls 14 cm long, spiny; partial inflorescence bracts, tubular, not splitting laterally, spiny; rachillae ca. 20, 1 cm long (unexpanded); rachillae bracts 1 mm high, acuminate; floral bracteoles cupular; staminate flowers (immature) 1 mm long; calyx 1 mm long, split for about half its length into 3 lobes; corolla 1 mm long, split for most of its length into 3 valvate petals; stamens 6; pistillate inflorescences not known. (Henderson, A.J., Ban, N.K. & Dung, N.Q. 2008: New species of Calamus (Palmae) from Vietnam. – Palms; Journal of the International Palm Society 52(4): 187-197)A

Materials Examined

  • 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!).

    Vietnam. Da Nang City, Hoa Vang District, Ba Na-Nui Chua Nature Reserve, 16°00'N, 108°01'E, ca. 800 m, 18 Apr 2007, Henderson et al. 3290 (HN, NY); Da Nang City, Hoa Vang District, Ba Na- Nui Chua Nature Reserve, road to summit 16°00'N, 108°01'E, ca. 900 m, 23 Apr 2007, Henderson et al. 3317 (HN, NY). (Henderson, A.J., Ban, N.K. & Dung, N.Q. 2008: New species of Calamus (Palmae) from Vietnam. – Palms; Journal of the International Palm Society 52(4): 187-197)A

Bibliography

    A. Henderson, A.J., Ban, N.K. & Dung, N.Q. 2008: New species of Calamus (Palmae) from Vietnam. – Palms; Journal of the International Palm Society 52(4): 187-197