Neostapfia colusana

(Burtt Davy) Burtt Davy
Common names: Colusagrass
Endemic
Treatment appears in FNA Volume 25. Treatment on page 295.
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Plants cespitose, eventually forming rather large clumps, covered with prominent brown viscid glands at maturity. Culms 10-30 cm, simple, ascending or decumbent, often geniculate, not breaking apart at the nodes. Sheaths loosely enveloping the culms; blades 2-5 cm long, 5-12 mm wide. Spikes 2-8 cm long, 8-12 mm thick. Lower lemmas about 5 mm long, about 3 mm wide, 7-11-veined; anthers about 2.5 mm. Caryopses about 2.5 mm. 2n = 40.

Discussion

Neostapfia colusana grows in vernal pools of Colusa, Merced, Solano, and Stanislaus counties, California, at elevations below 125 m. It is listed by the U.S. Fish and Wildlife Service as a threatened species because of its restricted habitat, much of which has been destroyed. The stout, cylindrical spikes emerging from the sheathing leaves resemble miniature ears of maize. This and the abundant viscid secretion make N. colusana a particularly distinctive species.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Neostapfia colusana"
2.5 cm25 mm <br />0.025 m <br /> (?) +
John R. Reeder +
(Burtt Davy) Burtt Davy +
1 (?) +  and 3 (?) +
multiple +, , +  and single +
keeled +  and rounded +
pseudopetiolate +  and branching +
not fused +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
membranous +
not pseudopetiolate +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
mushroom-button--shaped +
usually linear +  and lanceolate occasionally ovate +
5mm;12mm +
spikelike +
obovoid +  and compressed +
2.5 cm25 mm <br />0.025 m <br /> (?) +
dumbbell--shaped +
Colusagrass +
decumbent +  and ascending +
geniculate +
10 cm100 mm <br />0.1 m <br /> (30 cm300 mm <br />0.3 m <br />) +
not waisted +
capillary +
pistillate +  and staminate +
sometimes longer +
round +  and compressed +
shorter or longer +
subtending +
toothed +  and denticulate +
uncinate +
spicate +  and ebracteate +
paniculate +  and racemose +
cylindrical +  and clavate or capitate +
hollow +  and solid +
not absent +
5 cm50 mm <br />0.05 m <br /> (?) +
flabellate +
0mm +  and 3mm +
emarginate +  and truncate +
0.2 cm2 mm <br />0.002 m <br /> (?) +
concealed +  and prominent +
2 +  and 1 +
well-developed +
subequal +  and or slightly shorter +
much narrower +
dry +  and fleshy +
disarticulating +
2 cm20 mm <br />0.02 m <br /> (?) +  and 8 cm80 mm <br />0.08 m <br /> (?) +
cylindrical +
0.8 cm8 mm <br />0.008 m <br /> (?) +  and 1.2 cm12 mm <br />0.012 m <br /> (?) +
pedicellate +  and sessile +
1 +  and 60 +
compressed +
1 (?) +  and 3 (?) +
compound +  and simple +
2 (?) +  and 3 (?) +
Gramineae +
Neostapfia colusana +
Neostapfia +
species +
membranous +
conspicuous +
5 +  and 17 +
plant +  and cespitose +
aquatic +  and terrestrial +
pilose +  and glabrous +
dioecious +, monoecious +  and synoecious +