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FOC | Family List | FOC Vol. 19 | Rubiaceae

23. Diplospora Candolle, Prodr. 4: 477. 1830.

狗骨柴属 gou gu chai shu

Authors: Tao Chen & Charlotte M. Taylor

Shrubs or small trees, sometimes polygamo-dioecious, unarmed; branches sometimes superaxillary. Raphides absent. Leaves opposite, sometimes with domatia; stipules persistent or deciduous, shortly united around stem, triangular. Inflorescences axillary or sometimes supra-axillary, cymose to fasciculate or glomerulate, few to many flowered, sessile to pedunculate, bracteate. Flowers subsessile to pedicellate, bisexual and monomorphic or unisexual. Calyx limb truncate to 4(or 5)-lobed or -denticulate. Corolla white, pale green, or pale yellow, salverform, inside pubescent in throat and sometimes on lower part of lobes; lobes 4(or 5), convolute in bud. Stamens 4(or 5), inserted in corolla throat, exserted; filaments short; anthers dorsifixed. Ovary 2-celled, ovules 1-3(-6) in each cell on axile placentas; stigma 2-lobed, shortly exserted. Fruiting pedicels often elongating notably. Fruit yellow, orange, or red, baccate, subglobose or ellipsoidal-globose, fleshy or leathery, with calyx limb usually persistent; seeds several, medium-sized, angled, subglobose, or somewhat flattened, embedded in pulp derived from placenta; hilum linear or comma-shaped; radicle hypogynous.

About 20 species: tropical and subtropical Asia; three species (one endemic) in China.

This genus was reviewed by Robbrecht and Puff (Bot. Jahrb. Syst. 108: 114-119. 1986), then in more detail by Ali and Robbrecht (Blumea 35: 279-305. 1991). The description of the sexuality of the plants and flowers here follows Ali and Robbrecht (loc. cit.) and Puff et al. (Rubiaceae of Thailand, 84. 2005).

1 Leaves drying leathery or thickly papery, glabrous and rather shiny on both surfaces, abaxially with secondary veins plane or thinly prominulous, higher order venation hardly or not visible, without domatia; petioles glabrous.   1 D. dubia
+ Leaves drying papery or thinly leathery, glabrescent, strigillose, puberulent, tomentulose, or hirtellous abaxially or on both surfaces, abaxially with secondary veins prominent, higher order venation well marked and usually thinly raised, usually with domatia; petioles glabrescent, strigillose, or tomentulose   (2)
2 (1) Leaves abaxially pubescent along principal veins but glabrescent or very sparsely pubescent on blade; stipules usually deciduous after distalmost 1 or 2 nodes.   2 D. fruticosa
+ Leaves densely tomentulose abaxially; stipules usually persistent.   3 D. mollissima

Lower Taxa


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