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(American Journal of Botany. 2000;87:153-160.)
© 2000 Botanical Society of America, Inc.

A unique Hawaiian Schiedea (caryophyllaceae: Alsinoideae) with only five fertile stamens1

Warren L. Wagner4,1 and Elizabeth M. Harris5,2

1 Department of Botany, MRC-166, National Museum of Natural History, Smithsonian Institution, Washington, D.C. 20560 USA; and 2 The Ohio State University Herbarium, Museum of Biological Diversity, 1315 Kinnear Road, Columbus, Ohio 43212 USA

ABSTRACT

The floral organogenesis and subsequent ontogenies of the Hawaiian endemic species Schiedea pubescens from Maui, Moloka'i, and Lana'i, and the Wai'anae Mountains, O'ahu, populations previously considered to be varietally distinct, were examined using the scanning electron microscope (SEM). The O'ahu population consistently produced only five fertile stamens, those of the inner whorl. The five stamens of the alternisepalous or outer whorl abort prior to microsporogenesis and fail to elongate. Additional vegetative differences between the two taxa, combined with the floral morphology characters, merit the description of the O'ahu population as a new species, S. pentandra, described herein.

Key Words: Caryophyllaceae • endangered species • floral development • Hawaiian Islands • scanning electron microscopy • Schiedea






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