Imperata brevifolia

Vasey
Common names: Satintail
Treatment appears in FNA Volume 25. Treatment on page 621.

Culms 51-129 cm. Ligules 0.7-2.9 mm; blades 7-14 mm wide, linear to lanceolate, abaxial surfaces smooth, adaxial surfaces sometimes densely pilose basally, otherwise scabrous. Panicles 16-34 cm, dense; lower branches 2-5 cm, divergent. Callus hairs 8-12 mm; glumes 2.7-4.1 mm; lower lemmas 2.5-3.9 mm, membranous, glumelike; upper lemmas 1.4-2.4 mm, completely surrounding the ovary; stamens 1, filaments dilated at the base; anthers 1.3-2.3 mm, yellow to orange; styles 0.9-2.4 mm; stigmas 2.1-4 mm, purple to brown. 2n = 20.

Distribution

N.Mex., Tex., Utah, Calif., Ariz., Nev.

Discussion

Once known from wet or moist sites in the southwestern deserts from southern California, Nevada, and Utah to western Texas, Imperata brevifolia is currently known only from populations in Grand Canyon National Park. It was last collected outside the park in the early 1970s at a site that is now under Lake Powell. Most collections were made before 1945, in sites that are now used for housing or agriculture.

Imperata brevifolia was listed as a noxious weed by the state of California. The reason for the listing is not clear; it may have stemmed from confusion of this native species with one of the introduced weedy species.

In September 2003, G.F. Hrusa succeeded in persuading the California authorities that Imperata brevifolia should be taken off the state's noxious weed list. Endangered species status is now being sought.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Imperata brevifolia"
yellow +  and orange +
1 +  and 2 +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.23 cm2.3 mm <br />0.0023 m <br />) +
anatomy +  and kranz +
Mark L. Gabel +
1 (?) +  and 3 (?) +
keeled +  and rounded +
pseudopetiolate +  and branching +
divergent +  and parallel +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
pseudopetiolate +
non-radiate +  and radiate +
well-developed +
linear +  and lanceolate +
reduced +
0.7 cm7 mm <br />0.007 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
spikelike +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
light +  and dark-brown +
ovate +  and obovate +
Satintail +
purple +  and reddish +
51 cm510 mm <br />0.51 m <br /> (129 cm1,290 mm <br />1.29 m <br />) +
not woody +
N.Mex. +, Tex. +, Utah +, Calif. +, Ariz. +  and Nev. +
sometimes longer +
compressed +  and terete +
subtending +
compressed +  and rounded +
subequal +
0.27 cm2.7 mm <br />0.0027 m <br /> (0.41 cm4.1 mm <br />0.0041 m <br />) +
membranous +
longer +  and long +
uncinate +
0.7 cm7 mm <br />0.007 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
bracteate +  and ebracteate +
pedunculate +  and multiple-stalked +
1 cm10 mm <br />0.01 m <br /> (7 cm70 mm <br />0.07 m <br />) +
axillary +  and subtending +
cylindrical +  and conical +
solid +  and hollow +
photosynthetic +
not aromatic +
membranous +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.29 cm2.9 mm <br />0.0029 m <br />) +
membranous +
inconspicuous +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.39 cm3.9 mm <br />0.0039 m <br />) +
complex +  and simple +
concealed +  and prominent +
3 +  and 4 +
pedicellate +
16 cm160 mm <br />0.16 m <br /> (34 cm340 mm <br />0.34 m <br />) +
not fused +
dry +  and fleshy +
elongate +
in triplets +  and paired +
usually smaller +  and reduced +
purple +  and brown +
elongate +
0.21 cm2.1 mm <br />0.0021 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
fused +  and free +
free +  and connate +
2 +  and 3 +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.24 cm2.4 mm <br />0.0024 m <br />) +
dome--shaped +  and triangular +
Gramineae +
Imperata brevifolia +
Imperata +
species +
cuplike +
membranous +
sessile-pedicellate +
0.14 cm1.4 mm <br />0.0014 m <br /> (0.24 cm2.4 mm <br />0.0024 m <br />) +
aquatic +  and terrestrial +
dioecious +, monoecious +  and synoecious +