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Bambusoid Affinities of the North Temperate Genus Brachyelytrum (Gramineae)

Christopher S. Campbell, Philip E. Garwood and Lawrence P. Specht
Bulletin of the Torrey Botanical Club
Vol. 113, No. 2 (Apr. - Jun., 1986), pp. 135-141
Published by: Torrey Botanical Society
DOI: 10.2307/2995937
Stable URL: http://www.jstor.org/stable/2995937
Page Count: 7
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Bambusoid Affinities of the North Temperate Genus Brachyelytrum (Gramineae)
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Abstract

In Brachyelytrum the embryo has a scutellar cleft, the seedling has a short first internode and no adventitious roots, root epidermal cells are uniformly sized, and leaves bear inconspicuous osmophilic layers in the mestome sheath cell walls. These data as well as previously published findings indicate that Brachyelytrum is most closely allied with the Bambusoideae, especially the herbaceous bambusoid grasses. It should be placed in the subfamily Bambusoideae, at least provisionally, until more is known about these taxa. There are, nevertheless, important differences in leaf anatomy between the Bambusoideae and Brachyelytrum. The eastern North American-eastern Asian disjunction of Brachyelytrum suggests a Laurasian origin, and its ancestors may have become adapted to the mesic forests of the Tertiary, perhaps accounting for the differences in leaf anatomy.

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