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A Biosystematic Study of Critical Species of Lactuca sect. Lactucopsis

Viera Feráková
Folia Geobotanica & Phytotaxonomica
Vol. 5, No. 3/4 (1970), pp. 401-427
Published by: Springer
Stable URL: http://www.jstor.org/stable/4179592
Page Count: 31
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A Biosystematic Study of Critical Species of Lactuca sect. Lactucopsis
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Abstract

In the present paper the results of a biosystematic study of some critical species of Lactuca sect. Lactucopsis are given. After a morphological, chorological, partly cytotaxonomical, chemotaxonomical analysis and experimental crossings the author came to the conclusion that both L. wilhelmsiana Fisch. et Mey ex. DC. and L. chaixii Vill. should be treated as infraspecific taxa of L. quercina L. No differences were found between L. quercina and L. chaixii except in the basic shape of the cauline leaves. L. wilhelmsiana, however, can be distinguished by the length of the beak of the achene and by the distributional area. After revision the correct names of the taxa studied are as follows: Lactuca quercina L., L. quercina var. integrifolia Bogenh. (Bisch.) for L. chaixii, L. quercina subsp. wilhelmsiana (Fisch. et Mey. ex DC.) Feráková for L. wilhelmsiana.

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