Opizia

J. Presl
Treatment appears in FNA Volume 25. Treatment on page 269.

Plants annual, perennial, or of indefinite duration; monoecious or dioecious, inflorescences unisexual and dimorphic; stoloniferous and mat-forming. Culms 1-15 (30) cm, not woody. Leaves not clustered, not strongly distichous; sheaths open, keeled; ligules membranous, not ciliate; blades flat. Inflorescences terminal, with spikes or spikelike branches on elongate rachises. Staminate inflorescences panicles of 1-6 spikelike pectinate branches on elongate rachises, exserted well above the uppermost leaves; branches 0.5-2 cm, terminating in a point; staminate spikelets glabrous, with 1 floret; glumes unequal, much shorter than the the florets; lemmas 3-veined, unawned. Pistillate inflorescences 1-sided spikes, with 6-12 spikelets, often partially enclosed by the subtending sheaths, sometimes with branches to 6 mm long at the lower nodes; disarticulation below the glumes, the spikelets falling intact; pistillate spikelets laterally compressed, with 1 bisexual floret and a conspicuously 3-awned rudiment; lower glumes rudimentary or absent; upper glumes subequal to the lemmas, membranous, flat, not enclosing the florets, unawned; calluses blunt, with hairs; lemmas coriaceous, keeled, 3-veined, 3-awned, awns emanating from between 4 short, hyaline teeth; palea keels adnate to the rachilla basally, widely winged distally. x = unknown.

Discussion

Opizia is a North America genus of two species. Both species are probably native to Mexico, but one of them now grows, possibly from introductions, in Florida and the West Indies.

Columbus (1999) argued that Opizia should be included in Bouteloua. The traditional treatment is maintained here, pending corroboration of his results from a wider range of data.

Lower Taxa

"decumbent" is not a number.

... more about "Opizia"
1 +  and 3 +
Mary E. Barkworth +
J. Presl +
1 (?) +  and 3 (?) +
multiple +, , +  and single +
keeled +  and rounded +
pseudopetiolate +  and branching +
not fused +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
membranous +
not pseudopetiolate +
pubescent +  and glabrous +
usually linear +  and lanceolate occasionally ovate +
0mm +  and 6mm +
pectinate +  and spikelike +
triangular +  and dome--shaped +
sometimes longer +
membranous +
ascending +  and erect +
1 cm10 mm <br />0.01 m <br /> (15 cm150 mm <br />0.15 m <br />) +
not woody +
not waisted +
capillary +
pistillate +  and staminate +
sometimes longer +
round +  and compressed +
reduced +
shorter or longer +
subtending +
unequal +
uncinate +
pistillate +  and stoloniferous +
paniculate +  and racemose +
mat-forming +  and dimorphic +
hollow +  and solid +
not absent +
coriaceous +
sometimes longer +
membranous +
inconspicuous +
concealed +  and prominent +
2 +  and 1 +
dry +  and fleshy +
spikelike +
elongate +
columbus1999a +  and mcvaugh1983b +
pistillate +  and staminate +
6 +  and 12 +
compressed +
1 (?) +  and 3 (?) +
compound +  and simple +
2 (?) +  and 3 (?) +
Gramineae +
Poaceae tribe Cynodonteae +
membranous +
7 +  and 13 +
perennial +  and annual +
aquatic +  and terrestrial +
dioecious +  and monoecious +
12 +, 10 +, 9 +, 8 +  and 7 +