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FOC | Family List | FOC Vol. 10 | Fabaceae

90. Butea Roxburgh ex Willdenow, Sp. Pl. 3: 857, 917. 1802.

紫矿属 zi kuang shu

Authors: Dezhao Chen, Prof. Dianxiang Zhang & Mats Thulin

Megalotropis Griffith; Meizotropis Voigt; Plaso Adanson.

Trees, climbing to erect shrubs, or perennial herbs. Leaves pinnately 3-foliolate; stipules small to medium-sized, caducous. Flowers large, orange-red or red, densely clustered in axillary or terminal racemes or panicles; bracts and bracteoles small, caducous. Calyx campanulate; teeth short, obtusely triangular, upper 2 connate into a broad entire or emarginate lip. Corolla medium-sized to large, exserted; petals subequal in size; standard ovate or lanceolate, apex acute, recurved, not appendaged; wings falcate, adherent to keel; keel longest, incurved, apex acute, back connate into a ridge. Stamens diadelphous; anthers uniform. Ovary sessile or shortly stipitate, 2-ovuled; style elongated, incurved, glabrous; stigma small, terminal. Legumes oblong, compressed, apex rounded, with 1 seed at top, empty and not dehiscent in lower part, often with stipe at base. Seed obovate; hilum small, estrophiolate.

Four or five species: Bangladesh, Bhutan, Cambodia, China, India, Indonesia, Laos, Myanmar, Nepal, Sri Lanka, Thailand, Vietnam; three species (one endemic) in China.

Meizotropis, with two species, was recognized by Sanjappa (Bull. Bot. Surv. India 29: 199-225. 1989), as well as by Schrire (in Lewis et al., Legumes World, 408. 2005). A broader view of Butea is taken here, but the matter is in need of further study.

1 Shrubs or perennial herbs, erect or scandent; leaflets 15-45 × 12-35 cm.   3 B. buteiformis
+ Trees or climbing shrubs; leaflets 6-17 × 4-15 cm   (2)
2 (1) Leaflets glabrous adaxially, reticulate veins distinct; seed broadly reniform or reniform-orbicular, ca. 2.7 cm, reddish brown; trees.   1 B. monosperma
+ Leaflets densely velutinous with whitish yellow hairs on both surfaces, much denser abaxially, reticulate veins indistinct, areoles obscure; seed reniform, 2-2.2 cm, blackish brown; climbing shrubs.   2 B. braamiana

Lower Taxa


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