Digitaria serotina

(Walter) Michx.
Endemic
Treatment appears in FNA Volume 25. Treatment on page 370.

Plants annual; often mat-forming. Culms 10-30 cm, decumbent and rooting at the lower nodes. Sheaths conspicuously and densely hairy, longer hairs 1.5-2.5 mm, papillose-based, shorter hairs about 0.5 mm, not papillose-based; ligules 1.5-2.5 mm; blades 2-9 cm long, 3-8 mm wide, conspicuously hairy on both surfaces, longer hairs 1.5-2.5 mm, papillose-based, shorter hairs about 0.5 mm, not papillose-based. Panicles with 2-9 spikelike primary branches, digitate or on rachises to 4 cm; primary branch axes 3-10 cm, wing-margined, wings wider than the midribs, lower and middle portions bearing spikelets in groups of 3; secondary branches rarely present; shortest pedicels 0.5-0.8 mm; midlength pedicels 1.5-2 mm; longest pedicels 3-3.5 mm, adnate to the branch axes basally. Spikelets homomorphic, 1.5-1.8 mm, lanceolate. Lower glumes absent; upper glumes 1/6-1/3 as long as the spikelets, margins and apices with appressed white hairs, hairs about 0.3 mm; lower lemmas 7-veined, veins equally spaced, appressed-pubescent between the inner lateral-veins and on the margins, hairs 0.3-0.5 mm, minutely verrucose (use 50x magnification); upper lemmas yellow or tan at maturity. 2n - unknown.

Distribution

Va., N.C., Ga., La., Del., Ala., Pa., Miss., S.C., Fla.

Discussion

Digitaria serotina is native to the coastal plain of the southeastern United States. It has also been found in Cuba, possibly as an introduction, and on a ballast dump in Philadelphia, Pennsylvania. Its densely hairy sheath and short, densely hairy blades make this one of the more distinctive species of Digitaria in the Flora region.

Selected References

None.

Lower Taxa

None.

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

... more about "Digitaria serotina"
Obtuse (?) +  and Acuminate (?) +
anatomy +  and kranz +
J.K. Wipff +
(Walter) Michx. +
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 cm20 mm <br />0.02 m <br /> (9 cm90 mm <br />0.09 m <br />) +
usually linear +  and lanceolate occasionally ovate +
3mm;8mm +
triquetrous +
3 cm30 mm <br />0.03 m <br /> (10 cm100 mm <br />0.1 m <br />) +
spikelike +
not developed +
planoconvex +
sometimes longer +
decumbent +  and erect +
10 cm100 mm <br />0.1 m <br /> (30 cm300 mm <br />0.3 m <br />) +
Va. +, N.C. +, Ga. +, La. +, Del. +, Ala. +, Pa. +, Miss. +, S.C. +  and Fla. +
1/5 +  and 1/2 +
capillary +
germination +
pistillate +  and staminate +
sometimes longer +
compressed +  and terete +
shorter or longer +
subtending +
unequal +
membranous +
uncinate +
0.3 cm3 mm <br />0.003 m <br /> (?) +
bracteate +  and ebracteate +
solid +  and hollow +
cauline +  and basal +
coriaceous +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
membranous +
inconspicuous +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
complex +  and simple +
concealed +  and prominent +
2 +  and 1 +
subterranean +
dry +  and fleshy +
not papillose-based +
0.5 cm5 mm <br />0.005 m <br /> (?) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
in triplets +  and paired +
1 +  and 60 +
unisexual +  and bisexual +
lanceolate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
1 (?) +  and 3 (?) +
fused +  and free +
2 (?) +  and 3 (?) +
dome--shaped +  and triangular +
Gramineae +
Digitaria serotina +
Digitaria +
species +
membranous +
1/6 +  and 1/3 +
tan +  and yellow +
cartilaginous +, coriaceous +  and indurate +
appressed-pubescent +
verrucose +
plant +  and mat-forming +
aquatic +  and terrestrial +
dioecious +, monoecious +  and synoecious +