OBSERVATIONS ON THE SHAPE AND EXPOSURE OF STYLE BRANCHES IN THE ASTEREAE (COMPOSITAE) |
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| Authors: | Almut G. Jones |
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| Affiliation: | Department of Botany, University of Illinois at Urbana-Champaign, Urbana, 61801 |
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| Abstract: | A survey of over 30 species of Aster and 61 species in other genera of Astereae indicates that the somewhat flattened style branches of perfect disk florets characteristically unfold and spread in a pronate, rather than a supinate manner. While not exhibited in all genera (Baccharis and Conyza are among the exceptions), this phenomenon appears to be restricted to and, therefore, diagnostic for the tribe. The slender style branches of pistillate ray florets display the supinate expansion which is regularly observed in other tribes of Compositae. |
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