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Generic and Sectional Delimitation in Onagraceae, Tribe Epilobieae

Peter H. Raven
Annals of the Missouri Botanical Garden
Vol. 63, No. 2 (1976), pp. 326-340
DOI: 10.2307/2395311
Stable URL: http://www.jstor.org/stable/2395311
Page Count: 15
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Generic and Sectional Delimitation in Onagraceae, Tribe Epilobieae
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Abstract

The available evidence is used to produce a revised taxonomy for Onagraceae tribe Epilobieae, with two genera, Epilobium and Boisduvalia. Zauschneria is a specialized, bird-pollinated taxon closely related to one group of Epilobium, and it is consequently reduced to the status of a section of that genus. It is treated as comprising a single species with three tetraploid (n = 15) and three octoploid (n = 30) subspecies, between which extensive intergradation occurs. Chamerion (Chamaenerion), a Eurasian group of seven species, two reaching North America, is closely related to and doubtless shares a common ancestor with Epilobium sect. Epilobium; the other four sections are more distantly related. They include a total of seven species, all xerophytes confined to western North America, the probable place of origin of the tribe. Boisduvalia is treated as comprising two sections in place of the three recognized earlier, based upon further morphological studies and evidence obtained from artificial hybridization. The taxonomy proposed for the tribe Epilobieae appears to provide a balanced classification for the group that brings it into line with the other five tribes and 15 genera of the family.

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