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FOC | Family List | FOC Vol. 15 | Styracaceae

7. Pterostyrax Siebold & Zuccarini, Fl. Jap. 1: 94. 1839.

白辛树属 bai xin shu shu

Trees or shrubs, deciduous. Winter buds naked. Leaves alternate; stipules absent; leaf blade margin serrate or serrulate. Inflorescences pendulous, branches one-sided, many-flowered; bracteoles early deciduous. Pedicel short, jointed. Flowers bisexual. Calyx tube campanulate, 5-ribbed, completely adnate to ovary, 5-toothed. Corolla lobes 5, shortly coherent at base, imbricate. Stamens 10, 5 short and 5 long or subequal in length, 1 series; filaments flattened, basally connate into a membranous tube. Ovary mostly inferior, 3--5-locular; ovules 4 per locule, erect or pendulous, placentation axile. Style elongated, subulate; stigma capitate or obscurely 3-lobed. Fruiting pedicel short. Drupes dry, ribbed or winged, with a persistent style forming distinct beak, exocarp crusty, endocarp woody. Seeds 1 or 2, fleshy; endosperm thin.

Four species: E Asia; two species in China.

1 Fruit obovoid, prominently 5 winged, stellate tomentose; leaves abaxially stellate pubescent   1 Pterostyrax corymbosus
+ Fruit subfusiform, (5--)10 ribs, densely gray-yellow hirsute; leaves abaxially minutely stellate tomentose   2 Pterostyrax psilophyllus

Lower Taxa


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