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21. Kochia Roth, J. Bot. (Schrader). 1800(1): 307. 1801.

地肤属 di fu shu

Herbs annual, less often subshrubs, villous or pubescent, rarely glabrous. Stem erect or oblique, usually much branched. Leaves alternate, sessile or subsessile, terete, semiterete, or narrowly complanate, margin entire. Flowers axillary, sessile, usually 1-3-glomerulate, bisexual, sometimes some female, without bractlets. Perianth subglobose, 5-parted, herbaceous, usually hairy; segments incurved, abaxially with transverse, winglike, membranous, veined appendages in fruit. Disk absent. Stamens 5, inserted at base of perianth; filaments flattened; anthers broadly oblong, exserted. Ovary broadly ovoid; ovule subsessile; style obscure; stigmas 2 or 3, filiform, papillose. Utricle depressed globose; pericarp membranous, not adnate to seed. Seed horizontal, globose or ovoid, depressed, slightly emarginate near hilum; testa membranous, glabrous; embryo slender, annular; perisperm not copious.

Between ten and fifteen species: temperate zones of N Africa, Asia, Europe, and SW North America; seven species in China.

Scott (Feddes Repert. 89: 101–119. 1978) proposed to submerge Kochia and several other related genera into Bassia. A traditional circumscription of Kochia is accepted here.

1 Subshrubs.   1 K. prostrata
+ Herbs annual.   (2)
2 (1) Leaves terete or semiterete.   (3)
+ Leaves narrowly complanate.   (5)
3 (2) Winglike appendages of perianth segments unequal; leaves blue-green.   7 K. melanoptera
+ Winglike appendages of perianth segments equal; leaves green.   (4)
4 (3) Plants crowded branched; perianth glabrous, margin of winglike appendage entire.   5 K. krylovii
+ Plants sparsely branched; perianth densely pilose, margin of winglike appendage not entire.   6 K. laniflora
5 (2) Winglike appendage of perianth segments elongate, narrow, margin lacerate, apex long acuminate to caudate.   2 K. odontoptera
+ Winglike appendage of perianth segments not shaped as above.   (6)
6 (5) Plants densely gray-white pilose throughout; branches irregularly spreading, rigid; margin of winglike appendages of perianth segments erose.   3 K. stellaris
+ Plants subglabrous or only inflorescences ferruginous villous; branches ascending, slender; margin of winglike appendages of perianth segments repand or incised.   4 K. scoparia

Lower Taxa


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