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FOC | Family List | FOC Vol. 9 | Rosaceae

30. GEUM Linnaeus, Sp. Pl. 1: 500. 1753.

路边青属 lu bian qing shu

Li Chaoluan (Li Chao-luang); Hiroshi Ikeda, Hideaki Ohba

Herbs perennial, rhizomatous, sometimes stoloniferous. Stipules adnate to and sheathing petiole; radical leaves pinnate or pseudopinnate; terminal leaflet largest; lateral leaflets often in alternating larger and smaller pairs; cauline leaves few, often 3-foliolate or bractlike. Flowers solitary or in corymbs, bisexual. Hypanthium turbinate or hemispheric. Sepals 5, valvate, persistent; epicalyx segments 5, small, alternate with sepals. Petals 5, yellow, white, or red, orbicular or obovate. Stamens numerous, crowded. Disk lining hypanthium, smooth or ribbed. Carpels numerous, borne on prominent, usually cylindric receptacle, free; ovule ascending; style filiform, jointed; stigma slightly recurved or hooked, minute. Achenes sessile or stipitate, small, hooked at apex of beak. Seed erect; testa membranous; cotyledons oblong. x = 7.

About 70 species: widespread in temperate zones of both hemispheres; three species in China.

Wu Zhengyi (editor's note) believes that Geum sensu lato may include Acomastylis and even Taihangia.

1 Flowers nodding, 2–2.5 cm in diam.; sepals erect, ± purplish; petals yellow with purple stripes, semicordate, base long clawed.   3 G. rivale
+ Flowers erect, not more than 1.5 cm in diam.; sepals spreading, green; petals yellow, ovate or obovate, base not clawed.   (2)
2 (1) Receptacle hispidulous, hairs ca. 1 mm; cauline leaves 2–6-foliolate, sometimes repeatedly pinnatifid; terminal leaflet of radical leaves broadly rhombic-ovate or obovate-lanceolate, apex usually acuminate, rarely acute.   1 G. aleppicum
+ Receptacle hirtellous, hairs 2–3 mm; upper cauline leaves usually simple, entire or 3-lobed; terminal leaflet of radical leaves ovate to broadly obovate, apex rounded, rarely acute.   2 G. japonicum var. chinense

Lower Taxa


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