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国产苦荬菜类群的分类

石铸   

  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:1993-11-18 发布日期:1993-11-18
  • 通讯作者: 石铸

On the Classification of Ixeris Group (Compositae) from China

Shih Chu   

  • Received:1900-01-01 Revised:1900-01-01 Online:1993-11-18 Published:1993-11-18
  • Contact: Shih Chu

摘要:

 本文采用狭义概念,将苦荬菜类群(Ixeris group)处理为4个属,即苦荬菜属Ixeris Cass.沙苦荬属Chorisis DC.小苦荬属Ixeridium(A.Gray)Tzvel.及黄瓜菜属Paraixeris Nakai并提供了分属、种检索表。文中记载了3个新种及7个新组合种。

关键词: 苦荬菜属, 沙苦荬属, 小苦荬属, 黄瓜菜属, 新种, 新组合种

Abstract:

Ixeris Cass., strinctly speaking, is confined to plants which have achenes
with sharply winged ribs. Ixeridium (A. Gray ) Tzvel. contains plants which have
persistent radical leaves at anthesis and achenes with obtuse ribs and a fine ros-
trum at its apex. Paraixeris  Nakai is restricted to plants which are of the same
achenes as in the genus Ixeridium (A. Gray) Tzvel., but rostra of achenes are ro-
bust and radical leaves deciduous in flowering in the former. The Chorisis DC., a
monotypic genus, is characterized by ternate palatisect leaves.
      In the light of the above mentioned understanding of these genera, the author
thinks that the division of Chinese Ixeris group, a comparatively complex one, in-
to four genera would be more reasonable than merging them into one genus,
namely, Ixeris Cass. Based on the examination of specimens in the Herbarium of
the Institute of Botany, Academia Sinica (PE), the author found that there are
four species in the genus Ixeris Cass., including one new combination in China.
They are I. polycephala  Cass., I. dissecta (Makino) Shih, I. japonica (Burm.
f. ) Nakai and I. stolonifera A. Gray. The genus Ixeridium (A. Gray ) Tzvel. has
 13 species, including five new combinations and three new species in China,
namely, I. sagittaroides (C. B. Clarke) Shih, I. gramineum (Ledb.) Tzvel., I.
yunnarense Shih,I. graminifolium(Ledb.)Tzvel.,I, biparum Shih,I.aculeolatum Shih,I.
 chinense( Thunb. ) Tzvel., I. strigosum( Fisch. ) Tzvel., I. elegans( Franeh. ) Shih, I.
sonchifolium (Maxim.)Shih,I. laevigatum (BI.)Shih,I. dentatum(Thunb. )Nakai and I.
gracile(DC.)Shih, in China. There are six species in the  genus Paraixeris Nakai,
 including  One  new  combination,  namely, P. denticulata(Houtt.) Nakai, P.
 humifusa(Dunn) Shih, P. cheldonifolia( Makino) Nakai, P. saxatilis( Baran. ) Tzvel., P.
pinnatipartita (Makino)Tzvel. and P.serotina(Maxim.)Tzvel.in China.

Key words: Classification, Ixeris Cass., Ixeridium (A. Gray) Tzvel., Paraixeris Nakai, Chorisis DC., New species, New combinations