Volume 4 > Part 3 > Year 2018 > Page 331 > Leguminosae-Papilionoideae > Pterocarpus

2. Pterocarpus macrocarpus Kurzwfo-0000194875

J. Asiat. Soc. Bengal, Pt. 2, Nat. Hist. 43(2): 187. 1874; Baker in Hook.f., Fl. Brit. India 2: 239. 1876; Kurz, Forest Fl. Burma 1: 349. 1877; Watt, Dict. Econ. Prod. India 6(1): 357. 1892; Prain, J. Asiat. Soc. Bengal, Pt. 2, Nat. Hist. 66(2): 455. 1897; Brandis, Indian Trees: 239. 1906; Gagnep. in Lecomte, Fl. Indo-Chine 2: 465, f. 44. 1916; Craib, Fl. Siam. 1: 486. 1928; Hô, Illustr. Fl. Vietnam 1(2): 1119, f. 3177. 1991; Niyomdham et al., Fl. Cambodge, Laos & Vietnam 29: 58. 1997.— Lingoum macrocarpum (Kurz) Kuntze, Revis. Gen. Pl. 1: 192. 1891.

Accepted Name : This is currently accepted.

Synonyms & Citations :

Description : Deciduous tree to 30 m tall or more; young shoots, young leaves and inflorescences densely pubescent. Stipules linear, 5−10 mm long, very early caducous. Leaves 10−30 cm long; petioles 2−5 cm long; rachis 3.5−20 cm long, pubescent. Leaflets 3−13, ovate, oblong to lanceolate, 4.5−12 by 2.5−7 cm, terminal one larger than the others, apex acute to acuminate, mucronate, base rounded to cuneate, coriaceous, upper surface puberulous to pubescent, lower surface more densely; midrib raised above, lateral veins 9−13 pairs; petiolules 3−5 mm long. Inflorescences in leaf axils, sometimes terminal, usually raceme, rarely branched, 5−15 cm long; bracts and bracteoles lanceolate to linear lanceolate, 3−5 mm long, very early caducous; pedicels 5−10 mm long, pubescent. Calyx 5−6 mm long, pubescent. Corolla yellow to orangish yellow; standard broadly ovate to orbicular, 7−9 mm in diam., apex emarginate, base cuneate, claw 5−6 mm long; wings oblong, 7−9 by 4−5 mm, claw ca 3.5 mm long; keel oblong, 6−7 by ca 3 mm, claw ca 3.5 mm long. Stamens monadelphous or diadelphous, usually 5+5. Ovary densely hairy; ovules 2−4. Pods orbicular, 5−10 cm in diam., pubescent, 1−4-seeded. Seeds oblong-reniform, 7.5−9 by 3.5−4 mm, reddish brown to dark brown.

Thailand : NORTHERN: Mae Hong Son, Chaing Mai (Mae Bo Ku – type of Pterocarpus gracilis var. brevipes: Winit 166 -BK BM), Nan, Lamphun, Lampang, Phrae, Uttaradit, Tak, Sukhothai, Phitsanulok, Kamphaeng Phet; NORTH-EASTERN: Phetchabun, Loei, Sakon Nakhon, Maha Sarakham; EASTERN: Chaiyaphum, Nakhon Ratchasima, Si Sa Ket, Ubon Ratchathani; SOUTH-WESTERN: Uthai Thani, Kanchanaburi (Wang Khanai – type of P. cambodianus var. calcicolus: Kerr 12865 -BK [2 sheets] BM K TCD), Phetchaburi, Prachuap Khiri Khan; CENTRAL: Suphan Buri (Doem Bang Nang Buat – type of P. gracilis var. nitidus: Kerr 7000 -BK TCD), Saraburi; SOUTH-EASTERN: Chachoengsao, Chon Buri, Chanthaburi.

Distribution : Myanmar (type), Laos, Cambodia, Vietnam.

Ecology : In mixed deciduous and dipterocarp forests, 100–1,000 m alt.

Vernacular : Pradu (ประดู่), pradu pa (ประดู่ป่า)(Central); pradu sen (ประดู่เสน)(Saraburi); cha nong (ฉะนอง)(Chiang Mai); du (ดู่), du pa (ดู่ป่า)(Northern); chi-tok (จิต๊อก)(Shan-Mae Hong Son); ta-loe (ตะเลอ), toe-loe (เตอะเลอ)(Karen-Mae Hong Son).