On the Classification of Ixeris Group (Compositae) from China

Abstract

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

Shih Chu. On the Classification of Ixeris Group (Compositae) from China[J]. .

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On the Classification of Ixeris Group (Compositae) from China

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