Oncocalamus wrightianus

Family: Arecaceae    棕櫚樹

通用名稱: 沒有已知的

枝條抗寒性區: 11     英國和美國的地帶地圖

Oncocalamus wrightianus 學問

Clustered (?) slender palm climbing to 10 m. Stems without sheaths 6-10 mm in diameter, with 8-15 mm; internodes ± 15 cm long. Leaf sheaths striate, moderately to sparsely armed with caducous black spines, particularly concentrated and persistent on ocrea, often sloughing off to leave raised, triangular, blister-like scars, sheath sometimes becoming bare at base; white caducous indumentum present on mature sheaths, profuse on young sheaths; ocrea horizontally truncate, without conspicuous lobe, extending to ± 3 cm. Leaves sessile, or with a very short (less than 2 cm) petiole; rachis up to 60 cm long, unarmed; cirrus 35-45 cm long, unarmed; acanthophylls, 1.0-1.8 cm long. Leaflets composed of 2-4 folds, broadly lanceolate, ovate or sigmoid, 7-15 on each side of the rachis, 10-15 cm long, 2.5-5.0 cm broad at the widest point, with 2 or more prominent veins, leaflets margins sparsely armed with rather fine spines. Flower and fruit unknown.

This species is recorded as occurring in swamp forest only. Oncocalamus wrightianus is distinct from all the other species in this genus by its slender nature and relatively broad, sigmoid leaflets. This species was recently reduced to synonymy by Tuley (1995), who suggested that this species represented a juvenile form of Oncocalamus mannii. However, this is not the case as the juvenile leaves of the members of this genus are strongly bifid. More extensive field collections, particularly those of fertile material, are needed to enable a more detailed description of this taxon to be made. Vulnerable (VU) due to its restricted range and habitat loss.


最初是從, Benin, Nigeria

Oncocalamus wrightianus is known only from southern Benin and Nigeria, extending eastwards to the Niger Delta.

地點: Benin, Nigeria (6.733929°N, 4.392471°E)

地圖可能並不代表完整的自然分佈。 (衛星標記,顯示觀察數據)。

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