Broadleaf Forbs Ixeris Sonchifolia Seeds Ku Mai Cai
Ixeris Sonchifolia 苦荬菜
Ixeris is a genus of Asian flowering plants in the dandelion family.
Concepts of which species should be included in the genus have changed in recent years because of the use of molecular investigations. Numerous species formerly regarded as members of Ixeris have been moved to other genera (Agoseris Crepidiastrum Ixeridium Lactuca Paraixeris Paraprenanthes Sonchella Youngia).Species remaining in Ixeris or of uncertain affiliations are listed below.
Herbs, annual or perennial, often rosulate. Stems ± erect, sometimes also long creeping and with erect flowering branches. Synflorescence usually corymbiform. Capitula with (12-)15-25(-40) florets. Involucre cylindric to narrowly campanulate. Phyllaries in several series, glabrous; outer phyllaries several, longest 1/4-1/2 as long as inner ones; inner phyllaries usually 8, linear-lanceolate to lanceolate, equal in length, glabrous, margin usually scarious. Receptacle naked. Florets yellow, rarely whitish or purplish. Achene brown, ± fusiform, not compressed, with 10 (5 main ribs alternating with 5 ± equal secondary ribs) very prominent ± winglike ribs, space between ribs narrowly V- or U-shaped, apex contracted or attenuate into a filiform or slender beak. Pappus white, bristles scabrid.
About eight species: E and S Asia; six species in China.
The revised circumscription of Ixeris employed here follows the treatment by Pak and Kawano (Mem. Fac. Sci. Kyoto Univ., Ser. Biol. 15: 29-61. 1992), based on carpological and karyological investigations, which also includes the former monotypic Chorisis accommodating I. repens. Pak and Kawano’s concept of the genus has been corroborated recently in molecular phylogenetic analyses of subtribe Crepidinae by J. W. Zhang et al. (in prep.). Its basic chromosome number is x = 8.
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