Bothriochloa exaristata

(Nash) Henrard
Common names: Awnless bluestem
Treatment appears in FNA Volume 25. Treatment on page 642.

Culms 40-150 cm, erect; nodes glabrous, uppermost node often concealed within the sheaths. Leaves cauline, mostly glabrous; sheaths with a white, powdery bloom; ligules 1-2.2 mm; blades 10-20 cm long, 3-6 (8) mm wide, flat to folded. Panicles 4.5-15 cm, lanceolate; rachises with numerous branches; branches shorter than the rachises, erect-appressed, lacking axillary pulvini; rame internodes with a central groove about as wide as the margins, margins densely villous, hairs 4-6 mm, obscuring the spikelets. Sessile spikelets 2.5-4 mm long, 0.6-0.8 mm wide, narrowly ovate; lower glumes glabrous or sparsely short-pilose, lacking a dorsal pit; awns absent or to 6 mm; anthers 0.5-1.5 mm. Pedicellate spikelets shorter than the sessile spikelets, sterile. 2n = 60.

Discussion

Bothriochloa exaristata grows in heavy soils of fields and roadsides of the Gulf coastal prairie, at 2-150 m, as well as in coastal areas of southern Brazil and adjacent Argentina, and inland along the Rio Pilcomayo to Paraguay. It has been reported from Los Angeles County, California. When growing in dense grassland thickets, B. exaristata has rather spindly basal growth, but branches abundantly from the middle and upper nodes.

Selected References

None.

Lower Taxa

None.

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

... more about "Bothriochloa exaristata"
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
anatomy +  and kranz +
Kelly W. Allred +
(Nash) Henrard +
1 (?) +  and 3 (?) +
geniculate +
keeled +  and rounded +
pseudopetiolate +  and branching +
divergent +  and parallel +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
pseudopetiolate +
non-radiate +  and radiate +
well-developed +
10 cm100 mm <br />0.1 m <br /> (20 cm200 mm <br />0.2 m <br />) +
flat +  and folded +
reduced +
3mm;6mm +
spikelike +
flattened +, lanceolate +  and oblong +
Awnless bluestem +
purple +  and reddish +
40 cm400 mm <br />0.4 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
not woody +
Tex. +  and La. +
capillary +
sometimes longer +
concealing +
compressed +  and terete +
shorter or longer +
subtending +
compressed +  and rounded +
unequal +
uncinate +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 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 /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
membranous +
inconspicuous +
short-pilose +  and glabrous +
complex +  and simple +
concealed +  and prominent +
sessile-pedicellate +
heterogamous +
lanceolate +
4.5 cm45 mm <br />0.045 m <br /> (15 cm150 mm <br />0.15 m <br />) +
fused +  and free +
dry +  and fleshy +
elongate +
pedicellate +  and sessile +
in triplets +  and paired +
well-developed +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.6mm +  and 0.8mm +
1 (?) +  and 3 (?) +
fused +  and free +
2 (?) +  and 3 (?) +
dome--shaped +  and triangular +
Gramineae +
Bothriochloa exaristata +
Bothriochloa +
species +
membranous +
sessile-pedicellate +
plant +  and cespitose +
aquatic +  and terrestrial +
dioecious +, monoecious +  and synoecious +