Chhetri, Hari , Columbus, J. Travis .
A preliminary survey of leaf blade and lemma micromorphology in Sporobolus and relatives (Poaceae).
The tribe Zoysieae (Poaceae, Chloridoideae) comprises Calamovilfa (5 spp.), Crypsis (8), Eragrostis megalocarpa , Thellungia (1), Spartina (17), Sporobolus (160) and Zoysia (10). Most species are halophytes and are distributed from tropical to temperate regions except Calamovilfa and Thellungia, which are restricted to North America and Australia, respectively. Phylogenetic analyses of nuclear and chloroplast DNA sequences resolve the smaller genera as monophyletic but they are nested within a paraphyletic Sporobolus. A survey of leaf blade and lemma micromorphology using scanning electron microscopy was initiated to search for synapomorphies. Considerable useful variation has been uncovered thus far, including features of the short cells, papillae, and microhairs. Micromorphological synapomorphies have been identified for monophyletic genera as well as larger clades that include these genera along with species of Sporobolus. For instance, sunken microhairs (salt glands) are a synapomorphy of Spartina, and distinctive microhairs are common to Calamovilfa and its sister, Sporobolus floridanus .
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1 - Rancho Santa Ana Botanic Garden, Botany, 1500 N College Ave., Claremont, California, 91711, USA
2 - Rancho Santa Ana Botanic Garden, Botany, 1500 N College Avenue, Claremont, CA, 91711, USA
Presentation Type: Oral Paper:Papers for BSA Sections
Location: Cottonwood D/Snowbird Center
Date: Wednesday, July 29th, 2009
Time: 4:00 PM