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FOC | Family List | FOC Vol. 5 | Chenopodiaceae

42. Petrosimonia Bunge, Mém. Acad. Imp. Sci. Saint Pétersbourg, sér. 7. 4(11): 19, 52. 1862.

叉毛蓬属 cha mao peng shu

Herbs annual, ephemeral, appressed sericeous-villous, rarely glabrous. Stem much branched, terete. Leaves sessile, linear, terete or semiterete, apex acute or acuminate. Flowers axillary, solitary, bisexual, with 2 navicular, embracing bractlets. Perianth segments 2, 3, or 5, narrowly ovate-lanceolate to elliptic, slightly enlarged in fruit, membranous or papery, proximally becoming leathery and adaxially concave, without an appendage, veinless, glabrous or abaxially slightly hairy near apex. Stamens 1-5, inserted on an obscure disk; filaments compressed; anthers oblong or sagittate, exserted from perianth; connective protruding, becoming a thickened, solid appendage. Ovary broadly ovoid, compressed; ovule subsessile; style cylindric; stigmas 2, filiform. Utricle enclosed in perianth, ovate or broadly oblong; pericarp membranous or thinly papery, slightly fleshy distally, glabrous, not adnate to seed. Seed vertical, globose or subglobose, compressed; testa membranous; embryo planospiral; perisperm absent.

Between 11 and 15 species; C and SW Asia, SE Europe; four species in China.

1 Branches and leaves all opposite; perianth segments 5.   1 P. sibirica
+ Branches and leaves opposite below, alternate above; perianth segments 2 or 3.   (2)
2 (1) Branches and leaves opposite, except apical ones (in inflorescence) alternate; plants densely pubescent with long, semiappressed hairs.   2 P. squarrosa
+ Branches and leaves opposite only on lower stem, all others alternate; plants pubescent with short, appressed hairs or subglabrous.   (3)
3 (2) Plants blue-gray; lower branches suberect; bracts recurved or reflexed at apex, all longer than subtended flower.   3 P. glaucescens
+ Plants reddish or yellowish green; lower branches prostrate; bracts erect, upper ones shorter than subtended flower.   4 P. oppositifolia

Lower Taxa


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