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FOC | Family List | FOC Vol. 19 | Rubiaceae

2. Adina Salisbury, Parad. Lond. t. 115 ["116"]. 1808.

水团花属 shui tuan hua shu

Authors: Tao Chen & Charlotte M. Taylor

Shrubs or small trees, unarmed, often deciduous; buds conical. Raphides absent. Leaves opposite, distichous or decussate, usually with domatia; stipules persistent or deciduous, interpetiolar, bifid, nodes with a ring of persistent trichomes exposed after stipules fall. Inflorescences terminal and/or in axils of uppermost leaves, capitate with 1[to several] globose heads, pedunculate with peduncles usually articulate in basal half and bearing stipuliform bracts at middle, many flowered, bracteate; bracteoles linear to linear-spatulate. Flowers sessile, bisexual, monomorphic. Calyx limb 5-lobed. Corolla white, salverform to slenderly funnelform, glabrous inside; lobes 5, valvate in bud. Stamens 5, inserted in upper part of corolla tube, partially to fully exserted; filaments short, glabrous; anthers basifixed. Ovary 2-celled, ovules many in each cell, pendulous on axile placentas attached to upper 1/3 of septum; stigma globose to obovoid, exserted. Fruiting heads globose, at maturity shattering easily. Fruit capsular, obconic, septicidally then loculicidally dehiscent into 4 valves separating from base to apex from each other and from septum, cartilaginous to papery, with septum persistent or tardily deciduous, with calyx limb persistent on septum; seeds numerous, small, fusiform to oblanceoloid, flattened to rounded, with embryo portion obovoid, ellipsoid, oblong, or trigonous, sometimes with short wing at one or both ends.

Four species: China, Japan, Korea, Thailand, Vietnam; three species in China.

1 Deciduous low shrubs; leaves distichous, subsessile to shortly petiolate, petioles to 2 mm, leaf blade 2.5-4 × 0.8-1.2 cm; flowering heads borne separately on axillary or sometimes apically paired peduncles.   3 A. rubella
+ Evergreen shrubs or small trees; leaves decussate, petiolate, petioles 2-12 mm, leaf blade 4-18 × 1.5-6 cm; flowering heads borne separately on axillary or sometimes apically paired peduncles and/or infrequently or often in cymes of 3 or 5   (2)
2 (1) Leaf blade 4-12 × 1.5-3 cm, abaxially glabrous or sparsely puberulent on costa, petioles 2-6 mm; stipules persistent to caducous, 3-8 mm, puberulent to glabrous, lobes lanceolate to ovate; flowering heads infrequently in cymes of 3.   1 A. pilulifera
+ Leaf blade 6-18 × 2.3-6 cm, abaxially sparsely to densely puberulent on veins to throughout, petioles 3-12 mm; stipules caducous, 4-5 mm, glabrous, lobes narrowly triangular; flowering heads often in cymes of 3 or 5.   2 A. pubicostata

Lower Taxa


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