The systematic position of Centaurea ensiformis and Centaurea isaurica from Turkey and the evolution of some characters in Centaurea
Yükleniyor...
Dosyalar
Tarih
2004
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
LASER PAGES PUBL LTD
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
The systematic affinities of Centaurea ensiformis and Centaurea isaurica, two rare Turkish endemics, were difficult to establish on the basis of morphological characters. Their systematic position was recently unraveled by DNA sequence analyses, and they appear to be related to sect. Cheirolepis. We have carried out a detailed study of the main morphological characters that are used for the sectional classification of Centaurea, the appendages of the bracts and the achenes, in a wide sample of sect. Cheirolepis. The main conclusion is that the extremes of diversity in the shape of the appendages can be connected by intermediate forms, and a hypothesis of the evolution of the appendages is offered. This hypothesis, together with some cases of parallel evolution, would explain why there are so many examples of misclassifications based on this character alone. Regarding achenes, our conclusion is that they are important for the species level, but not useful for sectional classification of this group. Finally, the closely related sect. Plumosipappus, described mainly on microcharacters of the pappus, must be merged into Cheirolepis.
Açıklama
Anahtar Kelimeler
compositae, Centaurea, Turkey, systematics, evolution
Kaynak
ISRAEL JOURNAL OF PLANT SCIENCES
WoS Q Değeri
Q4
Scopus Q Değeri
Q3
Cilt
52
Sayı
3
