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FOC | Family List | FOC Vol. 12 | Sterculiaceae

12. Byttneria Loefling, Iter Hispan. 313. 1758.

刺果藤属 ci guo teng shu

Butneria Duhamel du Monceau.

Lianas, shrubs, or subshrubs, rarely small trees. Stems armed or unarmed (in Flora area). Leaves simple, stipulate, petiolate; leaf blade various shapes, but usually orbicular or ovate; foliar nectaries present. Inflorescences axillary, cymes. Flowers bisexual, small. Sepals 5, connate at base. Petals 5, base clawed, upper part deeply concave, apex with long narrow appendage. Stamens 5, opposite petals; filaments connate into tube; anthers 2-celled, extrorse; staminodes 5, lamellate, apex obtuse, alternate with staminodes. Ovary sessile, 5-celled; ovules 2 per cell, anatropous, lower one aborted; style united almost to apex; stigma apical, inconspicuous or 5-lobed. Capsule globose, spiny, septicidally and loculicidally or only septicidally dehiscent into 5 valves, valves falling from axis. Seeds 1 per locule; endosperm absent; cotyledons foliaceous, 2-lobed.

About 130 species: mostly in tropical America, also Africa, SE Asia, Madagascar; three species in China.

The genus name has often been incorrectly spelled as "Buettneria."

1 Leaf margin serrulate, leaf blade scabrous; capsule spines branched, soft.   1 B. pilosa
+ Leaf margin entire, leaf blade not scabrous; capsule spines not branched, hard   (2)
2 (1) Leaf blade abaxially densely white stellate tomentose; capsule 3-4 cm in diam., spines short and robust; seeds ca. 12 mm, black when mature.   2 B. grandifolia
+ Leaf blade abaxially glabrous or sparsely stellate pubescent on veins; capsule 1.5-2 cm in diam., spines long and needlelike; seeds ca. 5 mm, gray-brown with dark brown mottling.   3 B. integrifolia

Lower Taxa


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