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Studies on Amsinckia. I. A Synopsis of the Genus, with a Study of Heterostyly in it
Peter M. Ray and Haru F. Chisaki
American Journal of Botany
Vol. 44, No. 6 (Jun., 1957), pp. 529-536
Published by: Botanical Society of America, Inc.
Stable URL: http://www.jstor.org/stable/2438922
Page Count: 8
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A synopsis of the North American species of Amsinckia is presented. The occurrence of hereto-styly in Amsinckia is reexamined and verified for A. grandiflora, A. Douglasiana, A. furcata and A. spectabilis, and reported for the first time in A. lunaris. The genetics of heterostyly in A. spectabills is comparable with that in Primula, but the plants are self-fertile and the two forms do not differ in pollen size. In the other species the flower forms differ in pollen size, but at least some are self-fertile. In A. lunaris a "partial homostyle" form, which is capable of pollinating both pin and thrum, regularly occurs. No examples of true heterostyly were encountered in the section MURICATAE.
American Journal of Botany © 1957 Botanical Society of America, Inc.