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Leontopodium R. Br. ex Cass.

火绒草属

Description from Flora of China

Herbs, rarely subshrubs, perennial. Stem with fibers in phloem, without resin canals, without pericyclic cambium. Leaves alternate, sessile, tomentose to villous, eglandular, margin flat, entire. Capitula heterogamous, disciform, in flat-topped terminal corymbs, surrounded by a whorl of prominent, white lanate leaves. Receptacle flat, epaleate. Phyllaries papery, monomorphic, monochromous, brownish, transparent; stereome undivided. Female florets yellow, filiform, outnumbering disk florets. Disk florets functionally male; corolla yellow; corolla lobes erect, veins reaching apex of lobes. Anthers ecalcarate, with short tails; endothecial tissue polarized; apical appendage flat, as wide as thecae. Pollen gnaphalioid. Style bifid; style branches truncate with obtuse sweeping hairs dorsally, not reaching furcation; stigmatic surface separated. Achene in disk and female florets small, oblong, with 5 vascular bundles, sparsely hairy with short, clavate, not myxogenic, twin hairs; epidermis smooth. Pappus dimorphic, of basally connate, barbellate, capillary bristles in 1 row; apical cells clavate in disk florets, acute in female. x = 7.

Handel-Mazzetti recorded several putative natural hybrids in Leontopodium from China, including L. ×albogriseum Handel-Mazzetti (Verh. Zool.-Bot. Ges. Wien 74-75: 28. 1926), described from Yunnan, L. ×gracile (Acta Horti Gothob. 1: 121. 1924), described from W Sichuan, and several others indicated by hybrid formulae (Acta Horti Gothob. 12: 231-237. 1938). It is somewhat difficult to distinguish them according to our present knowledge.

About 58 species: Asia, Europe; 37 species (17 endemic) in China.

(Authors: Chen Yousheng (陈又生); Randall J. Bayer)


 

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