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43. Cladrastis Rafinesque, Cincinnati Lit. Gaz. 1(8): 60. 1824.

香槐属 xiang huai shu

Authors: Bojian Bao & Michael A. Vincent

Trees, deciduous, rarely woody lianas; bud enclosed within inflated base of petiole. Leaves imparipinnate; stipules absent; stipels present or absent; leaflets alternate or subopposite, membranous, entire. Paniculate racemes terminal; bracts and bracteoles caducous. Calyx campanulate; teeth 5. Corolla white (or pink); petals subequal. Stamens 10, free; filaments distinct or slightly joined at base; anthers versatile. Ovary linear-lanceolate, shortly stalked; ovules few to many; style incurved; stigmas small. Legume com­pressed, winged or not, tardily dehiscent. Seeds 1 to many.

Eight species: SE Asia and E North America; six species (five endemic) in China.

See the synopsis of Cladrastis by Duley and Vincent (Rhodora 105: 205-239. 2003).

1 Leaflets dark green adaxially, paler abaxially, stipels and bracteoles absent; legumes wingless   (2)
+ Leaflets concolorous, stipels present; bracteoles usually caducous; legume margins winged   (3)
2 (1) Leaflets ovate-lanceolate or oblong-lanceolate, broadest near rounded base; flowers up to 1.5 cm; ovary pilose.   2 C. delavayi
+ Leaflets ovate or oblong-ovate, broadest at or above middle, base acute; flowers ca. 2 cm; ovary densely sericeous.   6 C. wilsonii
3 (1) Leaflets less than 4 cm, nearly membranous; panicle less than 10 cm.   3 C. parvifolia
+ Leaflets more than 4 cm, papery; panicle 15-20 cm   (4)
4 (3) Wooden lianas or climbing shrubs; wings and keels smaller than standard.   5 C. scandens
+ Trees; wings and keels larger than standard   (5)
5 (4) Stipels simple, subulate, 1 on each side of pulvinus; fruit apex and base acute; leaflets typically 11 or more.   4 C. platycarpa
+ Stipels branched and/or 2 or more on each side of pulvinus; fruit apex and base rounded; leaflets typically 9 or fewer.   1 C. chingii

Lower Taxa


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