Bothriochloa laguroides

(DC.) Herter
Common names: Silver bluestem
Treatment appears in FNA Volume 25. Treatment on page 640.

Culms 35-115 (130) cm tall, usually less than 2 mm thick, erect or geniculate at the base, branched at maturity; nodes shortly hirsute, pilose with erect hairs, or glabrous. Leaves usually basal (sometimes cauline on robust plants), usually glaucous; ligules 1-3 mm; blades 5-25 cm long, 2-7 mm wide, flat to folded, mostly glabrous. Panicles 4-12 (14) cm, narrowly oblong or lanceolate, silvery-white or light tan; rachises 4-8 cm, with more than 10 branches; branches 1-5.5 cm, erect-appressed, rarely with axillary pulvini, lower branches shorter than the rachises, usually with more than 1 rame; rame internodes with a groove wider than the margins, margins copiously hairy, hairs 3-9 mm, at least somewhat obscuring the spikelets. Sessile spikelets 2.5-4.5 mm, ovate, somewhat glaucous, apices blunt; lower glumes glabrous or hirtellous, rarely with a dorsal pit; awns 8-16 mm; anthers 0.6-1.4 mm. Pedicellate spikelets 1.5-2.5 (3.5) mm, shorter than the sessile spikelets, sterile. 2n = 60.

Distribution

Ala., Ark., Ariz., Kans., Miss., N.Mex., Okla., Pacific Islands (Hawaii), Fla., Tex., La., Ill., Nev., Nebr., Tenn., Colo., Calif., Ga., Ind., Ohio, Utah, Mo., S.C., Ky.

Discussion

Bothriochloa laguroides grows in well-drained soils of grasslands, prairies, roadsides, river bottoms, and woodlands, often on limestone, usually at 20-2100 m. Plants from the United States and northern Mexico belong to B. laguroides subsp. torreyana (Steud.) Allred & Gould, which differs from B. laguroides (DC.) Herter subsp. laguroides in its glabrous, or almost glabrous, nodes, long internode hairs, and pilose throat region. Occasional plants are found with spreading branches and axillary pulvini; they do not merit formal recognition. Bothriochloa laguroides subsp. torreyana is used in landscaping. It does well on rocky slopes and sandy banks.

Bothriochloa laguroides has been confused with B. saccharoides (Sw.) Rydb., a more southern species that differs from B. laguroides in having pilose leaves, a narrow central groove in the internodes and pedicels, and panicle branches with axillary pulvini.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number."elongated" is not a number."wider" is not a number.

... more about "Bothriochloa laguroides"
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
anatomy +  and kranz +
Kelly W. Allred +
(DC.) Herter +
1 (?) +  and 3 (?) +
geniculate +
0.8 cm8 mm <br />0.008 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
divergent +  and parallel +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
pseudopetiolate +
non-radiate +  and radiate +
well-developed +
5 cm50 mm <br />0.05 m <br /> (25 cm250 mm <br />0.25 m <br />) +
flat +  and folded +
reduced +
2mm;7mm +
spikelike +
flattened +, lanceolate +  and oblong +
Silver bluestem +
purple +  and reddish +
35 cm350 mm <br />0.35 m <br /> (115 cm1,150 mm <br />1.15 m <br />) +
geniculate +
30 cm300 mm <br />0.3 m <br /> (250 cm2,500 mm <br />2.5 m <br />) +
not woody +
0 cm0 mm <br />0 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Ala. +, Ark. +, Ariz. +, Kans. +, Miss. +, N.Mex. +, Okla. +, Pacific Islands (Hawaii) +, Fla. +, Tex. +, La. +, Ill. +, Nev. +, Nebr. +, Tenn. +, Colo. +, Calif. +, Ga. +, Ind. +, Ohio +, Utah +, Mo. +, S.C. +  and Ky. +
capillary +
sometimes longer +
concealing +
compressed +  and terete +
shorter or longer +
subtending +
compressed +  and rounded +
unequal +
uncinate +
0.3 cm3 mm <br />0.003 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
bracteate +  and ebracteate +
pedunculate +  and multiple-stalked +
axillary +  and subtending +
solid +  and hollow +
photosynthetic +
not aromatic +
coriaceous +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
membranous +
inconspicuous +
hirtellous +  and glabrous +
complex +  and simple +
concealed +  and prominent +
glabrous +, pilose +  and hirsute +
sessile-pedicellate +
heterogamous +
14 cm140 mm <br />0.14 m <br /> (?) +
light tan +  and silvery-white +
lanceolate +  and oblong +
4 cm40 mm <br />0.04 m <br /> (12 cm120 mm <br />0.12 m <br />) +
fused +  and free +
dry +  and fleshy +
elongate +
pedicellate +  and sessile +
in triplets +  and paired +
well-developed +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
1 (?) +  and 3 (?) +
fused +  and free +
2 (?) +  and 3 (?) +
dome--shaped +  and triangular +
Gramineae +
Bothriochloa laguroides +
Bothriochloa +
species +
membranous +
sessile-pedicellate +
plant +  and cespitose +
aquatic +  and terrestrial +
dioecious +, monoecious +  and synoecious +