Andropogon arctatus

Chapm.
Common names: Pinewoods bluestem
Endemic
Treatment appears in FNA Volume 25. Treatment on page 655.

Plants cespitose or somewhat rhizomatous, upper portion dense, oblong to ovate. Culms 90-170 cm; internodes occasionally somewhat glaucous just below the nodes; branches straight, erect to ascending. Sheaths smooth, rarely some¬what scabrous; ligules 0.3-0.9 mm, sometimes ciliate, cilia to 0.5 mm; blades 15-35 cm long, 3-8 mm wide, glabrous or densely pubescent, hairs spreading. Inflorescence units 5-45 per culm; subtending sheaths (3.3) 3.8-6.8 (9) cm long, (2.5) 3.2-4 (5) mm wide; peduncles (9) 26-66 (115) mm, with 2 (4) rames; rames (2.2) 2.6-4.3 (5.3) cm, usually exserted at maturity, pubescence either evenly distributed or more dense distally within each internode. Sessile spikelets (4.3) 4.9-5.4 (6.1) mm; callus hairs 1.5-2.5 mm; keels of lower glumes scabrous from below the midpoint; awns 5-16 mm; anthers 1 (3), 2-3.5 mm, red. Pedicellate spikelets vestigial or absent. 2n = 20.

Discussion

Andropogon arctatus grows in flatwoods, bogs, and scrublands of southern Alabama and Florida. Its flowering appears to be stimulated by fire but, unlike other members of sect. Leptopogon in the Flora region, the effect lasts only one or two years, the plants then remaining vegetative until the next fire occurs. It is similar to A. ternarius, but differs in its long, usually solitary anther and shorter spikelets.

Selected References

None.

Lower Taxa

None.

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

... more about "Andropogon arctatus"
0.2 cm2 mm <br />0.002 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
anatomy +  and kranz +
Christopher S. Campbell +
Chapm. +
1 (?) +  and 3 (?) +
0.5 cm5 mm <br />0.005 m <br /> (1.6 cm16 mm <br />0.016 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 +
15 cm150 mm <br />0.15 m <br /> (35 cm350 mm <br />0.35 m <br />) +
pubescent +  and glabrous +
convolute +, folded +, flat +  and linear +
reduced +
3mm;8mm +
erect;ascending +
spikelike +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
Pinewoods bluestem +
much-branched +
purple +  and reddish +
90 cm900 mm <br />0.9 m <br /> (170 cm1,700 mm <br />1.7 m <br />) +
not woody +
N.C. +, Fla. +  and Ala. +
capillary +
sometimes longer +
concealing +
compressed +  and terete +
shorter or longer +
subtending +
compressed +  and rounded +
unequal +
uncinate +
bracteate +  and ebracteate +
pedunculate +  and multiple-stalked +
3.8 cm38 mm <br />0.038 m <br /> (6.8 cm68 mm <br />0.068 m <br />) +
0.32 cm3.2 mm <br />0.0032 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
with inconspicuous veins +  and veined +
fimbriate +  and cupulate +
solid +  and hollow +
photosynthetic +
not aromatic +
coriaceous +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 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 /> (?) +
2.2 cm22 mm <br />0.022 m <br /> (?) +  and 9 cm90 mm <br />0.09 m <br /> (?) +
2.6 cm26 mm <br />0.026 m <br /> (?) +  and 4.3 cm43 mm <br />0.043 m <br /> (?) +
dry +  and fleshy +
elongate +
pedicellate +  and sessile +
in triplets +  and paired +
well-developed +
usually smaller +  and reduced +
0.49 cm4.9 mm <br />0.0049 m <br /> (0.54 cm5.4 mm <br />0.0054 m <br />) +
1 (?) +  and 3 (?) +
fused +  and free +
2 (?) +  and 3 (?) +
dome--shaped +  and triangular +
Gramineae +
Andropogon arctatus +
Andropogon sect. Leptopogon +
species +
membranous +
sessile-pedicellate +
inconspicuous +
plant +  and cespitose +
aquatic +  and terrestrial +
dioecious +, monoecious +  and synoecious +