Digitaria cognata

(Schult.) Pilg.
Common names: Fall witchgrass
Synonyms: Leptoloma cognatum
Treatment appears in FNA Volume 25. Treatment on page 362.

Plants perennial; cespitose, without rhizomes. Culms 30-56 cm, erect; nodes glabrous. Leaves mainly cauline; sheaths glabrous or sparsely to densely pubescent, sometimes with papillose-based hairs; ligules 0.2-1.5 mm, entire to lacerate; blades 2.4-12.6 cm long, 2-5.4 mm wide, glabrous or pubescent. Panicles simple, 12.8-27.5 cm long, 16.5-44.5 cm wide, open; branches divergent; lower primary branches 10.5-24 cm, often with 1-several sterile branches near the base; pedicels divergent, spikelets solitary. Spikelets 2.2-3.1 mm long, 0.7-1.1 mm wide, obovate or broadly elliptic. Lower glumes 0.1-0.8 mm; upper glumes 1.8-2.8 mm, 3 (5) -veined, glabrous or pubescent between the veins, hairs appearing as a narrow stripe; lower lemmas similar to the upper glumes in length, texture, and pubescence, 7-veined, veins unequally spaced, lateral-veins closer together than the 3 central veins; upper lemmas 1.9-2.9 mm, glabrous, dark-brown, narrowly acute; anthers 0.5-0.7 mm, yellow or purple. Caryopses 1.3-1.6 mm. 2n = 36.

Distribution

Conn., Mass., N.H., N.Y., Vt., Del., Wis., Ont., Fla., N.J., Tex., La., Tenn., N.C., S.C., Pa., Va., Md., Ala., Ark., Ill., Ga., Ind., Iowa, Kans., Nebr., Okla., Ohio, Mo., Minn., Mich., Miss., Ky.

Discussion

Digitaria cognata grows in dry, sandy soils in the eastern portion of the Flora region from southern Ontario and Vermont through the United States and thence to southern Mexico.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Digitaria cognata"
purple +  and yellow +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
obtuse +  and acuminate +
anatomy +  and kranz +
J.K. Wipff +
(Schult.) Pilg. +
1 (?) +  and 3 (?) +
keeled +  and rounded +
pseudopetiolate +  and branching +
divergent +  and parallel +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
membranous +
disarticulating +  and pseudopetiolate +
non-radiate +  and radiate +
2.4 cm24 mm <br />0.024 m <br /> (12.6 cm126 mm <br />0.126 m <br />) +
pubescent +  and glabrous +
usually linear +  and lanceolate occasionally ovate +
0.2 cm2 mm <br />0.002 m <br /> (0.54 cm5.4 mm <br />0.0054 m <br />) +
triquetrous +
spikelike +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
not developed +
planoconvex +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
sometimes longer +
Fall witchgrass +
at aerial culm nodes +  and branching +
30 cm300 mm <br />0.3 m <br /> (56 cm560 mm <br />0.56 m <br />) +
Conn. +, Mass. +, N.H. +, N.Y. +, Vt. +, Del. +, Wis. +, Ont. +, Fla. +, N.J. +, Tex. +, La. +, Tenn. +, N.C. +, S.C. +, Pa. +, Va. +, Md. +, Ala. +, Ark. +, Ill. +, Ga. +, Ind. +, Iowa +, Kans. +, Nebr. +, Okla. +, Ohio +, Mo. +, Minn. +, Mich. +, Miss. +  and Ky. +
1/5 +  and 1/2 +
capillary +
germination +
pistillate +  and staminate +
sometimes longer +
compressed +  and terete +
shorter or longer +
subtending +
unequal +
membranous +
papillose-based +
uncinate +
bracteate +  and ebracteate +
solid +  and hollow +
coriaceous +
entire +  and lacerate +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
membranous +
inconspicuous +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
10.5 cm105 mm <br />0.105 m <br /> (24 cm240 mm <br />0.24 m <br />) +
complex +  and simple +
concealed +  and prominent +
2 +  and 1 +
open +  and simple +
12.8cm +  and 27.5cm +
subterranean +
16.5 cm165 mm <br />0.165 m <br /> (44.5 cm445 mm <br />0.445 m <br />) +
dry +  and fleshy +
glabrous or +  and sparsely densely pubescent +
in triplets +  and paired +
0.22 cm2.2 mm <br />0.0022 m <br /> (0.31 cm3.1 mm <br />0.0031 m <br />) +
1 +  and 60 +
unisexual +  and bisexual +
elliptic +  and obovate +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.82 cm8.2 mm <br />0.0082 m <br />) +
0.7mm +  and 1.1mm +
1 +  and 3 +
fused +  and free +
2 +  and 3 +
dome--shaped +  and triangular +
Leptoloma cognatum +
Digitaria cognata +
Digitaria +
species +
membranous +
pubescent +  and glabrous +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
0.19 cm1.9 mm <br />0.0019 m <br /> (0.29 cm2.9 mm <br />0.0029 m <br />) +
cartilaginous +, coriaceous +  and indurate +
plant +  and cespitose +
aquatic +  and terrestrial +
dioecious +, monoecious +  and synoecious +