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FOC | Family List | FOC Vol. 9 | Rosaceae

47. PRINSEPIA Royle, Ill. Bot. Himal. Mts. 206. 1835.

扁核木属 bian he mu shu

Gu Cuizhi (Ku Tsue-chih); Bruce Bartholomew

Plagiospermum Oliver.

Shrubs, erect or scandent, deciduous. Branches with leafless or few-leaved axillary spines, pith lamellate. Winter buds small, with a few hairy scales. Stipules small, soon caducous. Leaves alternate, sometimes fascicled on short shoots, simple; petiole short, often ill-defined, with or without slender and inconspicuous nectaries; leaf blade glabrous, margin entire or serrulate. Inflorescences solitary or fascicled on short branchlets in leaf axils of previous year’s branches, racemose, or 1-flowered. Flowers bisexual. Pedicel absent or essentially so. Hypanthium mouth with an annular disc. Sepals 5, unequal, persistent in fruit. Petals 5, white, cream, or yellow, suborbicular, base clawed. Stamens 10 or more, in 2 or more whorl, inserted on hypanthium rim; filaments short. Ovary superior, glabrous, 1-loculed; ovules 2, parallel, pendulous. Style lateral; stigma capitate. Fruit a drupe; mesocarp fleshy; endocarp leathery, smooth or slightly furrowed.

About five species: China, Himalayas; four species (three endemic) in China.

1 Spines leafy, rarely leafless; flowers in racemes, rarely solitary or fascicled; stamens more than 10, in several whorls.   (2)
+ Spines leafless; flowers in a fascicle or solitary; stamens 10, in 2 whorls.   (3)
2 (1) Racemes with many flowers.   1 P. utilis
+ Racemes with few flowers or flowers solitary.   2 P. scandens
3 (1) Hypanthium campanulate; petals yellow.   3 P. sinensis
+ Hypanthium turbinate; petals white.   4 P. uniflora

Lower Taxa


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