Sporobolus giganteus

Nash
Common names: Giant dropseed
Treatment appears in FNA Volume 25. Treatment on page 131.

Plants perennial; cespitose, not rhizomatous. Culms 100-200 cm, (3) 4-10 mm thick near the base. Sheaths rounded below, striate, margins hairy distally, apices with conspicuous tufts of hairs, hairs to 2 mm; ligules 0.5-1.5 mm; blades 10-50 cm long, (3) 4-10 (13) mm wide, flat, glabrous on both surfaces, margins whitish, scabridulous. Panicles all terminal, 25-75 cm long, 1-4 cm wide, spikelike, dense, usually included in the uppermost sheath; lower nodes with 1-2 (3) branches; primary branches mostly 0.5-6 cm, appressed or spreading to 30° from the rachis, spikelet-bearing to the base; secondary branches appressed; pulvini glabrous; pedicels 0.5-2 mm, appressed. Spikelets 2.5-3.5 (4) mm, whitish to plumbeous. Glumes unequal, narrowly lanceolate, membranous, prominently keeled; lower glumes 0.6-2 mm; upper glumes 2-3.5 (4) mm, subequal to the lemmas; lemmas 2.5-3.5 (4) mm, linear-lanceolate, membranous, glabrous, acute; paleas 2.4-3.4 (3.8) mm, linear-lanceolate, membranous, glabrous; anthers 0.6-1 mm, yellowish. Fruits 0.8-1.7 mm, ellipsoid, light yellowish-brown, sometimes translucent. 2n = 36.

Distribution

Kans., Okla., Colo., N.Mex., Tex., Utah, Ariz.

Discussion

Sporobolus giganteus grows in sand dunes and sandy areas along rivers and roadsides, at elevations from 100-1830 m. Its range extends from the southwestern United States into northern Mexico.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Sporobolus giganteus"
quadrangular +, fusiform +, obovoid +  and ellipsoid +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Paul M. Peterson +, Stephan L. Hatch +  and Alan S. Weakley +
1 (?) +  and 3 (?) +
multiple +, , +  and single +
keeled +  and rounded +
pseudopetiolate +  and branching +
not fused +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
membranous +
not pseudopetiolate +
10 cm100 mm <br />0.1 m <br /> (50 cm500 mm <br />0.5 m <br />) +
4mm;10mm +
spikelike +
triangular +  and dome--shaped +
sometimes longer +
membranous +
Giant dropseed +
100 cm1,000 mm <br />1 m <br /> (200 cm2,000 mm <br />2 m <br />) +
not woody +
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Kans. +, Okla. +, Colo. +, N.Mex. +, Tex. +, Utah +  and Ariz. +
not waisted +
capillary +
pistillate +  and staminate +
sometimes longer +
bisexual +  and fertile +
round +  and compressed +
reduced +
light yellowish-brown +
ellipsoid +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
shorter or longer +
subtending +
keeled +  and lanceolate +
unequal +
membranous +
uncinate +
0 cm0 mm <br />0 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
paniculate +  and racemose +
hollow +  and solid +
not absent +
acute +  and linear-lanceolate +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
membranous +
sometimes longer +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
inconspicuous +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
scabridulous +
concealed +  and prominent +
2 +  and 1 +
linear-lanceolate +
0.24 cm2.4 mm <br />0.0024 m <br /> (0.34 cm3.4 mm <br />0.0034 m <br />) +
membranous +
25cm +  and 75cm +
spikelike +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
mucilaginous +
adherent +  and free +
dry +  and fleshy +
spreading;appressed +
0.5 cm5 mm <br />0.005 m <br /> (6 cm60 mm <br />0.06 m <br />) +
spikelike +
whitish +  and plumbeous +
1 +  and 60 +
rounded +  and laterally compressed +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
1 (?) +  and 3 (?) +
compound +  and simple +
2 (?) +  and 3 (?) +
Gramineae +
Sporobolus giganteus +
Sporobolus +
species +
membranous +
conspicuous +
0.2 cm2 mm <br />0.002 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
quadrangular +, fusiform +, obovoid +  and ellipsoid +
7 +  and 13 +
plant +  and cespitose +
aquatic +  and terrestrial +
dioecious +, monoecious +  and synoecious +