Juncus texanus

(Engelmann) Coville in J. K. Small

in J. K. Small,Flora of the Southeastern United States 259. 1903.

Common names: Texas rush
Endemic
Basionym: Juncus nodosus var. texanus Engelmann Trans. Acad. Sci. St. Louis 2: 471. 1868
Treatment appears in FNA Volume 22.

Herbs, perennial, rhizomatous, 2.5–6 dm. Rhizomes 1 mm diam., with swollen nodes. Culms erect, terete, 1–3 mm diam., smooth. Cataphylls 0 or 1–2, straw-colored, apex rounded. Leaves: basal 0–1, cauline 3–5, auricles 1.5–2.5 mm, apex rounded to acutae, scarious; blade straw-colored to green, terete, 5.5–20 cm × 1–2.5 mm. Inflorescences terminal panicles of 2–16 heads, 2.5–6 cm, branches ascending, spreading, or reflexed; primary bract erect to spreading; heads 10–40-flowered, spheric, 11–15 mm diam. Flowers: tepals green or straw-colored to reddish-brown, lance-subulate, apex acuminate; outer tepals (3.5–) 4–4.9 mm; inner tepals 3.9–5.4 mm; stamens 6, anthers 2–3 times filament length. Capsules exserted, chestnut-brown, 1-locular, lance-subulate, 5.2–6.5 (–8) mm, apex tapering, valves separating at dehiscence, fertile throughout or only proximal to middle. Seeds obovoid, 0.45–0.5 mm, not tailed; body clear yellowbrown.


Phenology: Fruiting summer.
Habitat: Swamps, depressions, seeps, sand or gravel bars, and wet mud
Elevation: 400–600 m

Discussion

Selected References

None.

Lower Taxa

None.

"-3timesfilamentlength" is not declared as a valid unit of measurement for this property.

... more about "Juncus texanus"
persistent +
tapering +, acuminate +, rounded +  and acutae +
scarious +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Ralph E. Brooks* +  and Steven E. Clemants* +
(Engelmann) Coville in J. K. Small +
Juncus nodosus var. texanus +
straw-colored +  and green +
5.5 cm55 mm <br />0.055 m <br /> (20 cm200 mm <br />0.2 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
clear yellowbrown +
ascending +  and erect +
terete +, involute +  and flat +
reflexed;spreading;reflexed;spreading;ascending +
0.65 cm6.5 mm <br />0.0065 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
chestnut-brown +
lance-subulate +
0.52 cm5.2 mm <br />0.0052 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
straw-colored +
Texas rush +
La. +, Okla. +  and Tex. +
400–600 m +
arranged +  and cluster +
headlike +
Swamps, depressions, seeps, sand or gravel bars, and wet mud +
10-40-flowered +
1.1 cm11 mm <br />0.011 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
spheric +
pseudoaxillary +  and terminal +
0.39 cm3.9 mm <br />0.0039 m <br /> (0.54 cm5.4 mm <br />0.0054 m <br />) +
cauline +  and basal +
3 +  and 1 +
swollen +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.49 cm4.9 mm <br />0.0049 m <br />) +
green;brown or purplish black +
persistent +
Fruiting summer. +
parietal +  and axile +
erect +  and spreading +
in J. K. Small,Flora of the Southeastern United States +
1 cm10 mm <br />0.01 m <br /> (?) +
not tailed;obovoid +
0.045 cm0.45 mm <br />4.5e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
green;brown or purplish black +
persistent +
generally longer +
Juncus sect. Septati +
Juncus texanus +
Juncus subg. Septati +
species +
straw-colored +  and reddish-brown +
lance-subulate +
2.5 cm25 mm <br />0.025 m <br /> (6 cm60 mm <br />0.06 m <br />) +
only proximal;middle +