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FOC | Family List | FOC Vol. 10 | Fabaceae | Gleditsia

6. Gleditsia japonica Miquel, Ann. Mus. Bot. Lugduno-Batavi. 3: 54. 1867.

山皂荚 shan zao jia

Trees or small trees, to 25 m tall. Branchlets purplish brown or grayish green when bark falls off, slightly ribbed, with scattered whitish lenticels, smooth and glabrous. Spines pur­plish brown to brownish black, slightly flat, robust, 2-15.5 cm, often branched. Leaves pinnate or bipinnate (pinnae 2-6 pairs), 11-25 cm; petiolules very short; leaflets 3-10 pairs, adaxially sometimes shiny, ovate-oblong or ovate-lanceolate to oblong, 2-7(-9) × 1-3(-4) cm (leaflets of bipinnate leaves obviously smaller), papery to thickly papery, abaxially puberulent on mid­vein and at base, glabrescent when old, adaxially puberulent or glabrous, slightly scabrous, reticulate veinlets obscure, base broadly cuneate or rounded, slightly oblique, margin entire or repand-crenate, apex rounded, sometimes emarginate. Flowers yellowish green, in axillary or terminal, puberulent spikes. Male inflorescence 8-20 cm; female inflorescence 5-16 cm. Male flowers: 5-6 mm in diam.; receptacle deep brown, ca. 1.5 mm, outside densely brown puberulent; sepals 3 or 4, triangular-lanceolate, ca. 2 mm, both surfaces pubescent; petals 4, elliptic, ca. 2 mm, pubescent; stamens 6-8(or 9). Female flowers: 5-8(-9) mm in diam.; receptacle ca. 2 mm; sepals and petals 4 or 5, similar to those of male flowers in shape, ca. 3 mm, both surfaces densely pubescent; staminodes 4-8; ovary glabrous; ovules numerous; style short, incurved; stigma inflated, 2-lobed. Legume brown or brownish black, compressed, strap-shaped, 20-54 × 2-7 cm, irregularly twisted or falcate, apex with beak 5-15 mm; stipe 1.5-3.5(-5) cm; valves leathery, often bullate, glabrous or velutinous, shiny. Seeds numerous, deep brown, elliptic, 9-10 × 5-7 mm, smooth. 2n = 28*.

Sunny slopes, valleys, streamsides, near roads, forests; 100-2500 m. Anhui, Guizhou, Hebei, Henan, Hunan, Jiangsu, Jiangxi, Liaoning, Shandong, Yunnan, Zhejiang [Japan, Korea].

1 Legume densely yellowish green velutinous.   6b var. velutina
+ Legume glabrous   (2)
2 (1) Legume 20-35 × 2-4 cm, female flowers 5-6 mm in diam..   6a var. japonica
+ Legume 30-54 × 4.5-7 cm; female flowers 7-8(-9) in diam..   6c var. delavayi

Lower Taxa


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