Premium
STYLE ROTATION IN THE ASTERACEAE
Author(s) -
Robinson Harold
Publication year - 1984
Publication title -
taxon
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 81
eISSN - 1996-8175
pISSN - 0040-0262
DOI - 10.1002/j.1996-8175.1984.tb03893.x
Subject(s) - heliantheae , asteraceae , subfamily , senecioneae , biology , botany , gene , biochemistry
Summary The style of the Asteraceae varies in the direction of its branching. In examples studied in the subfamily Asteroideae the disk flowers or flowers of homogamous heads have style branches diverging radially to the center of the head. In that subfamily, the style branches in the ray flowers are usually tangentially directed in the Heliantheae, Inuleae and Senecioneae, and are radially directed in the Astereae and Anthemideae. In examples studied in the subfamily Cichorioideae, the Lactuceae and Vernonieae have tangential style branches in all flowers, Carduus of the Cardueae has styles all radial, they vary in the Liabeae, and they have a Helianthean pattern in Haplocarpha of the Arctoteae. It seems significant that tribes with basically different style orientations in the ray and disk flowers of the same head are usually tribes where many members have sterile gynoecia in either the rays or the disk.