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Science 17 February 1984:
Vol. 223. no. 4637, pp. 695 - 696
DOI: 10.1126/science.223.4637.695
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Articles

Incompatibility Between the Dimorphic Flowers of Collomia grandiflora, a Cleistogamous Species

E. M. LORD 1 and K. J. ECKARD 1

1 Department of Botany and Plant Sciences, University of California, Riverside 92521

The cleistogamous species Collomia grandiflora produces dimorphic cross-incompatible flowers on a single plant. The open or chasmogamous flower has smaller, flask-shaped stigmatic papillae, larger pollen grains, longer styles, and faster pollen tube growth rates down the style than the closed or cleistogamous flower. In intermorph crosses, pollen tube growth rates are greatly decreased and fertilization does not occur.

Submitted on October 25, 1983
Accepted on November 17, 1983

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Science. ISSN 0036-8075 (print), 1095-9203 (online)