Andropogon ternarius

Michx.
Common names: Split bluestem
Synonyms: Andropogon argenteus
Treatment appears in FNA Volume 25. Treatment on page 653.

Plants cespitose. Culms 70-150 cm. Sheaths smooth or scabrous, sometimes pilose; ligules 0.4-1.5 mm, ciliate; blades 1-3 mm wide, pubescent or glabrous and glaucous. Inflorescence units 2-30+ per culm; peduncles usually 5-20 mm, with (1) 2 rames; rames 3-4 cm, exerted at maturity, terminating in a sessile-pedicellate spikelet pair; internodes sparsely to densely villous, hairs from as long as to twice as long as the sessile spikelets. Sessile spikelets 4.5-8.4 mm; callus hairs to 8 mm; awns 10-25 mm; anthers 3,1.2-2.3 mm. Pedicellate spikelets 1.5-3.6 mm, sterile. 2n = 40, 60.

Distribution

Md., Kans., Okla., Ala., Ark., D.C., Del., Fla., Ga., Ill., Ind., Ky., La., Mo., Miss., N.C., N.J., S.C., Tenn., Tex., Va.

Discussion

Andropogon ternarius grows in the southeastern United States and northern Mexico. It is planted as an ornamental and for erosion control on slopes in poor and sandy soils, and is tolerant of coastal conditions.

Andropogon ternarius is similar to A. arctatus but differs in its possession of three anthers and usually in its longer spikelets, both sessile and pedicellate.

Selected References

None.

Key

1 Rames densely villous, with hairs about twice as long as the sessile spikelets and more or less obscuring them; lower glumes of the sessile spikelets sometimes scabrous, without conspicuous veins between the keels Andropogon ternarius var. cabanisii
1 Rames sparsely villous, with hairs about as long as the sessile spikelets, but not obscuring them; lower glumes of the sessile spikelets scabrous, often conspicuously 2-veined between the keels Andropogon ternarius var. ternarius

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

... more about "Andropogon ternarius"
0.12 cm1.2 mm <br />0.0012 m <br /> (0.23 cm2.3 mm <br />0.0023 m <br />) +
anatomy +  and kranz +
Christopher S. Campbell +
Michx. +
1 (?) +  and 3 (?) +
1 cm10 mm <br />0.01 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
terete +  and flattened +
slender +
keeled +  and rounded +
pseudopetiolate +  and branching +
divergent +  and parallel +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
pseudopetiolate +
non-radiate +  and radiate +
well-developed +
glaucous +, glabrous +  and pubescent +
convolute +, folded +, flat +  and linear +
reduced +
1mm;3mm +
spikelike +
0 cm0 mm <br />0 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
Split bluestem +
much-branched +
purple +  and reddish +
70 cm700 mm <br />0.7 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
not woody +
Md. +, Kans. +, Okla. +, Ala. +, Ark. +, D.C. +, Del. +, Fla. +, Ga. +, Ill. +, Ind. +, Ky. +, La. +, Mo. +, Miss. +, N.C. +, N.J. +, S.C. +, Tenn. +, Tex. +  and Va. +
capillary +
sometimes longer +
concealing +
compressed +  and terete +
shorter or longer +
subtending +
compressed +  and rounded +
unequal +
uncinate +
bracteate +  and ebracteate +
pedunculate +  and multiple-stalked +
with inconspicuous veins +  and veined +
fimbriate +  and cupulate +
solid +  and hollow +
photosynthetic +
not aromatic +
coriaceous +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
membranous +
inconspicuous +
2-9-veined +  and veined +
concave +, flat +  and 2-keeled +
complex +  and simple +
concealed +  and prominent +
sessile-pedicellate +
heterogamous +
not fused +
3 cm30 mm <br />0.03 m <br /> (?) +
0.5 cm5 mm <br />0.005 m <br /> (?) +  and 2 cm20 mm <br />0.02 m <br /> (?) +
dry +  and fleshy +
elongate +
pilose +, scabrous +  and smooth +
pedicellate +, sessile +  and sessile-pedicellate +
in triplets +  and paired +
well-developed +
usually smaller +  and reduced +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.36 cm3.6 mm <br />0.0036 m <br />) +
1 (?) +  and 3 (?) +
fused +  and free +
2 (?) +  and 3 (?) +
dome--shaped +  and triangular +
Andropogon argenteus +
Andropogon ternarius +
Andropogon sect. Leptopogon +
species +
membranous +
sessile-pedicellate +
inconspicuous +
plant +  and cespitose +
aquatic +  and terrestrial +
dioecious +, monoecious +  and synoecious +