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Studies in the Cactaceae.
(1980)
Five taxa representing the three tribes of the Cactaceae have similar patterns of stamen and carpel initiation but display differences in early receptacle development. The first ring of stamens and the carpels arise ...
Biosystematic studies in the Echinocereus viridiflorus complex.
(1980)
Pollen of the Echinocereus viridiflorus complex is uniform throughout the group. The pollen is isopolar, radially symmetrical, prolate spheroidal, tricolpate, and 44 - 52 (mu) in diameter with a puncti-baculate exine. ...