Bothriochloa alta

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

Culms 1.3-2.5 m tall, 2-4 mm wide, stiffly erect, not or only sparingly branched; nodes hirsute, hairs 2-6 mm, stiff, spreading, tan; internodes glaucous below the nodes. Leaves cauline; ligules 1-3 mm; blades 20-30 cm long, 4-10 mm wide, glabrous or sparsely pilose near the base. Panicles 14-25 cm long on the larger shoots, 3-6 cm wide when pressed, oblong, dense; rachises 10-20 cm, with numerous branches, rachises and branches kinked and wavy at the base from compressed in the sheath; branches 2-8 cm, much shorter than the rachises, erect to appressed, with multiple rames; rame internodes villous on the margins, with 5-8 mm distal hairs. Sessile spikelets 4.5-6 mm, ovate; lower glumes shortly pilose, with or without a dorsal pit; awns 18-22 mm; anthers about 1 mm, often remaining in the floret, light-brown. Pedicellate spikelets 3.8-4.4 mm. 2n = 120.

Discussion

Bothriochloa alta grows along roads, drainage ways, and gravelly slopes in the desert grasslands of the south-western United States, at 600-1200 m, and extends south to Bolivia and Argentina. It is not a common species in the Flora region. It often grows with and is mistaken for B. barbinodis, but differs from that species in having longer culms, panicles, and nodal hairs, and 2n = 120. Plants in the southwestern United States have larger spikelets and more hairy panicles than those of central Mexico, where the species was originally described.

Selected References

None.

Lower Taxa

None.

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

... more about "Bothriochloa alta"
light-brown +
1 cm10 mm <br />0.01 m <br /> (?) +
anatomy +  and kranz +
Kelly W. Allred +
(Hitchc.) Henrard +
1 (?) +  and 3 (?) +
geniculate +
1.8 cm18 mm <br />0.018 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
divergent +  and parallel +
intravaginal +, extravaginal +, branching +  and basal +
compressed +
swelling +
pseudopetiolate +
non-radiate +  and radiate +
well-developed +
20 cm200 mm <br />0.2 m <br /> (30 cm300 mm <br />0.3 m <br />) +
pilose +  and glabrous +
usually linear +  and lanceolate occasionally ovate +
reduced +
4mm;10mm +
erect;appressed +
spikelike +
flattened +, lanceolate +  and oblong +
Tall bluestem +
purple +  and reddish +
130 cm1,300 mm <br />1.3 m <br /> (250 cm2,500 mm <br />2.5 m <br />) +
30 cm300 mm <br />0.3 m <br /> (250 cm2,500 mm <br />2.5 m <br />) +
not woody +
2mm +  and 4mm +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
N.Mex. +  and Tex. +
capillary +
sometimes longer +
concealing +
compressed +  and terete +
shorter or longer +
subtending +
compressed +  and rounded +
unequal +
uncinate +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
bracteate +  and ebracteate +
pedunculate +  and multiple-stalked +
axillary +  and subtending +
solid +  and hollow +
villous +  and glaucous +
photosynthetic +
not aromatic +
coriaceous +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
membranous +
inconspicuous +
complex +  and simple +
concealed +  and prominent +
sessile-pedicellate +
heterogamous +
14cm +  and 25cm +
3 cm30 mm <br />0.03 m <br /> (6 cm60 mm <br />0.06 m <br />) +
fused +  and free +
dry +  and fleshy +
pedicellate +  and sessile +
in triplets +  and paired +
well-developed +
0.38 cm3.8 mm <br />0.0038 m <br /> (0.44 cm4.4 mm <br />0.0044 m <br />) +
1 (?) +  and 3 (?) +
fused +  and free +
2 (?) +  and 3 (?) +
dome--shaped +  and triangular +
Gramineae +
Bothriochloa alta +
Bothriochloa +
species +
membranous +
sessile-pedicellate +
plant +  and cespitose +
aquatic +  and terrestrial +
dioecious +, monoecious +  and synoecious +