Anther Number, Anther Apical Appendages, and Pollination Biology of Calyptocarpus vialis Lessing (Heliantheae: Asteraceae)

Main Article Content

James R. Estes

Abstract

The numbers of disk floret anthers of Calyptocarpus vialis in Wichita County, Texas form a consecutive series of one to four; four anthers (71%) and three anthers (27%) were most common. Three anthers is an unusual, perhaps singular, number for Asteraceae. These florets also have four-lobed corollas. The extruded pollen-mass is enclosed by a vaulted dome created by apical appendages of the anthers that are lanceolate and inflexed. Pollination appears to be via autogamy (sensu stricto) for disk florets and (considering each head as a single blossom) facultative autogamy and allogamy (both geitonogamy and xenogamy) for the ray florets.

Article Details

Section
Articles
Author Biography

James R. Estes, Robert Bebb Herbarium University of Oklahoma Norman, Oklahoma University of Nebraska State Museum Lincoln, Nebraska

Biology Lecturer

Herbarium Curator