Oreopanax ramosissimus A. C. Sm.

Oreopanax ramosissimus A. C. Smith, Brittonia2: 256. 1936.
Tree; leaves simple, the petiole stout, up to 50 cm. long, closely ferruginous-tomentellose, glabreseent, the blade coriaceous, suborbicular in outline, up to 45 cm. in diameter, truncate or obtuse at the base, deeply 5-9-lobed, the sinuses rounded, cut to one-half or three-fourths the length of the leaf, the lobes oblong or elliptic, 4-8 cm. broad, gradually narrowed distally, acuminate at the apex, often sinuate at the margins, the upper surface glabrous, the lower surface densely and closely ferruginous-stellate-tomentose (the hairs many-branched, sessile), the primary nerves very prominent, the secondary nerves numerous, spreading, the veinlets copiously reticulate, prominent beneath; inflorescence many-branched, up to 40 cm. long and broad, the branches and peduncles closely stellate-tomentose, the bracts small, ovate, the peduncles racemosely arranged, 10-15 mm. long; hermaphrodite heads 5-6 mm. in diameter, the bractlets few, ovate-deltoid, 1-1.5 mm. long, acute, tomentellose without, the bracteoles submembranous, obovate-spatulate, 1-1.5 mm. long, tomentellose without; flowers glabrous, 4or 5-merous, the calyx carnose, obconic, about 1 mm. long; petals oblong-deltoid, about 1 mm. long; filaments up to 2 mm. long, the anthers less than 1 mm. long; summit of the ovary flat, the disk small, the styles 5, slender, free to the base, erect, about 0.5 mm. long.
Type locality: Martinique.
Distribution: Known only from the type locality.

Oreopanax ramosissimus là một loài thực vật có hoa trong Họ Cuồng cuồng. Loài này được A.C.Sm. mô tả khoa học đầu tiên năm 1936.