Tridens congestus

(L.H. Dewey) Nash
Common names: Pink tridens
Endemic
Treatment appears in FNA Volume 25. Treatment on page 36.

Plants cespitose, with shortly rhizomatous bases. Culms 30-75 cm. Sheaths glabrous, rounded; ligules to 0.5 mm, membranous, ciliate; blades 1.5-5 mm wide, tapering and involute distally. Panicles 5-8 (10) cm long, 1.2-2.5 cm wide, dense; branches 0.5-3 cm, erect to ascending; pedicels 1-3 mm. Spikelets 5-10 mm, with 5-12 florets. Glumes glabrous, usually tinged with pink, 1-veined; lower glumes 3-4.5 mm; upper glumes 4-4.5 (5) mm; lemmas 3-5 mm, usually tinged with pink, midveins and margins pubescent on the basal 1/3 - 1/2, midveins shortly excurrent, lateral-veins pilose to midlength, terminating before the distal margins; paleas 0.5-1 mm, shorter than the lemmas, scabrous on the veins, broadened below, bases bowed-out at maturity; anthers 1-1.5 mm. Caryopses (1) 1.5-2 mm. 2n = unknown.

Discussion

Tridens congestus grows in moist depressions, ditches, and low flats of otherwise dry hills in Texas. It resembles T. albescens, but usually has shorter panicles, spikelets that are more or less evenly pink rather than purple-tipped, and more deeply cleft lemma apices.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Tridens congestus"
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
rounded to truncate +
emarginate to bilobed +
Jesus Valdes-Reyna +
(L.H. Dewey) Nash +
1 (?) +  and 3 (?) +
multiple +, , +  and single +
keeled +  and rounded +
rhizomatous +
not fused +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
membranous +
not pseudopetiolate +
6 cm60 mm <br />0.06 m <br /> (25 cm250 mm <br />0.25 m <br />) +
pubescent +  and glabrous +
tapering +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
erect;ascending +
spikelike +
0.5 cm5 mm <br />0.005 m <br /> (3 cm30 mm <br />0.03 m <br />) +
pilose +  and glabrous +
reniform +  and compressed +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
triangular +  and dome--shaped +
sometimes longer +
membranous +
Pink tridens +
30 cm300 mm <br />0.3 m <br /> (75 cm750 mm <br />0.75 m <br />) +
not woody +
not waisted +
capillary +
pistillate +  and staminate +
sometimes longer +
5 +  and 12 +
sterile +  and bisexual +
round +  and compressed +
reduced +
tinged with pink +
shorter or longer +
subtending +
uncinate +
paniculate +  and racemose +
5 cm50 mm <br />0.05 m <br /> (40 cm400 mm <br />0.4 m <br />) +
hollow +  and solid +
not absent +
tinged with pink +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
membranous +
sometimes longer +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
membranous +
adnate +  and free +
inconspicuous +
0.3 cm3 mm <br />0.003 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
not thick +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
concealed +  and prominent +
2 +  and 1 +
pubescent +  and glabrous +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
broadened +
5cm +  and 8cm +
1.2 cm12 mm <br />0.012 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
dry +  and fleshy +
spikelike +
stoloniferous +
elongate +  and knotty +
1 +  and 60 +
compressed +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
1 +  and 3 +
compound +  and simple +
2 (?) +  and 3 (?) +
Gramineae +
Tridens congestus +
species +
membranous +
0.4 cm4 mm <br />0.004 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
ciliolate +, glabrous +  and hairy +
7 (?) +  and 13 (?) +
plant +  and cespitose +
aquatic +  and terrestrial +
dioecious +, monoecious +  and synoecious +