Volume 2 > Part 4 > Year 1981 > Page 444 > Simaroubaceae > Eurycoma

1. Eurycoma longifolia Jackwfo-0000683346

Mal. Mise. 2: 45. 1822; Craib in Fl. Siam. En. 1: 242. 1926; Noot. in Fl. Males., Ser. 1, Spermat. 6: 205. t. 6, 7a–e. 1962.

Accepted Name : This is currently accepted.

Description : Leaves up to ca 1 m long; leaflets lanceolate to obovate-lanceolate, rarely ovate-oblong, sometimes slightly acuminate with a bluntish or acute apex, ca 5–20 by 1.5–6 cm. Branches of inflorescence, pedicels, sepals, and calyx puberulous and with capitate-glandular hairs. Flowers reddish; bracts triangular, very small, up toe. 1 mm, caducous; pedicels rather thick, up to ca 7 mm. Calyx small, lobes ca 1 mm long. Petals puberulous on both surfaces, lanceolate to ovate- or obovate-oblong, ca 4–5–5.5 by 2–3 mm. Stamens usually longer than the calyx, ca 1.5–2.5 mm long, anthers ca 0.25 mm long; staminodes from 0.5 mm in female flowers to ca 2 mm in male flowers. Styles rather long, with a peltate 5(–6)-lobed stigma, elevated ca 1 mm above the ovaries. Fruits 10–17(–20) by 5–12 mm.

Thailand : NORTHERN: Chiang Mai (Doi Suthep, Mae Hat), Lampang (Mae Tua), Uttaradit (Huai Maeng Nua), Phitsanulok (Thung Salaeng Luang); NORTH-EASTERN: Khon Kaen (Nam Phong); EASTERN: Nakhon Ratchasima (Khao Yai NP), Ubon Ratchathani (Wariri Chamrap); CE

Distribution : Lower Burma, Laos, Cambodia, Indochina, Malesia (Sumatra, Malay Peninsula – type, Borneo].

Ecology : In primary and secondary, evergreen and mixed decidious forests as an understorey tree, typically growing on sandy soil, 0–700 m alt., but most frequent at low altitudes.

Vernacular : Tung so (ตุงสอ), phiak (เพียก)(Central); hae pan chan (แฮปั้นชั้น), kradat (กระดาษ)(Northern); plalai phuak (ปลาไหนเผือก); phuak (เผือก), lai phuak (ไหลเผือก)(Peninsular).

Uses: Roots, particularly the bark of the roots used as a febrifuge.