A REVISION OF THE GENUS ODONTONEMA (ACANTHACEAE)
A REVISION OF THE GENUS ODONTONEMA (ACANTHACEAE)
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Date
1982
Authors
Baum, Vicki M.
Advisor
Reveal, James L.
Citation
DRUM DOI
Abstract
Odontonema Nees (Acanthaceae, Acanthoideae, Acanthatae, Odontonemeae)
is a New World tropical or subtropical genus of 26 species and two
varieties. Members of the genus are distributed from coastal central
Mexico southward throughout Latin America into northern South America,
with one species located on the southeastern coast of Brasil (a second
species from Brasil is from an unknown location). Odontonema also is
found on the Caribbean Islands.
The genus consists of four major groups which, at this time, are
not given formal taxonomic recognition: 1) red-purple (rarely white)
flowered species (O. callistachyum and its relatives); 2) red flowered
species with typically a bottle-shaped corolla (O. schornburgkianum and
its relatives); 3) white-purple flowered species with a more strongly
bilabiate corolla (O. nitidum and its relatives); and 4) yellow flowered
species (O. hondurense and its relatives).
Although a few members of Odontonema may be seen in cultivation,
the present revision is based on an examination of herbarium material
found in both New and Old World herbaria, a numerical analysis of macromorphological
features, and an examination of pollen morphology. The
four groups within Odontonema defined above were established after the
numerical analysis, and all species save one (O. cuspidaturn) were found
to have 3-colporate pollen characteristic of sect. Odontonemeae. Descriptions
were prepared of each species based on available herbarium specimens...