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Gulf Coast bulrush

Habit Plants annual; rhizomes absent.
Culms

2–20 cm × 0.2–0.3 mm.

Leaves

sheaths green to stramineous;

distal blade mostly much longer than sheath, to 3 cm × 0.2 mm.

Inflorescences

involucral bract 1, 3–10(–25) mm, rarely a second bract to 5 mm.

Spikelets

2–8 × 1–1.5 mm;

scales colorless, stramineous, or pale greenish, markedly gibbous, veinless or obscurely 3–7-veined, midrib keeled, finely reticulate at 40X, membranous, hyaline, apex rounded, mucronate, or awned;

proximal scale to 1.5(–5) mm, awn to 3 mm;

other scales 1–1.2 mm, apex, mucro 0.1 mm.

Flowers

anthers 0.2 mm;

styles 3-fid.

Achenes

often falling with and clasped by floral scales, whitish (or orange-brown when unripe), broadly ellipsoid to obovoid or outline subcircular, nearly equilaterally trigonous, faces convex, 0.7–0.9 × 0.5–0.6 mm, minutely papillose at 40X, papillae in many vertical rows or usually obscured by thick whitish surface layer.

Isolepis pseudosetacea

Phenology Fruiting spring–summer.
Habitat Wet, freshwater, often drying, places in grasslands, open woods, limestone barrens, cultivated fields, waste places
Elevation 0(–100) m (0(–300) ft)
Distribution
from FNA
AL; AR; GA; LA; MO; MS; TX; s Europe; n Africa
[BONAP county map]
Discussion

Isolepis pseudosetacea is often mistaken for the very similar I. carinata, with which it sometimes grows but does not intergrade. It may easily be distinguished by the characters given in the key.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 23, p. 138.
Parent taxa Cyperaceae > Isolepis
Sibling taxa
I. carinata, I. cernua, I. setacea
Synonyms Scirpus pseudosetaceus, I. molesta, Scirpus molestus
Name authority (Daveau) Gandoger: Cat. Pl. Espagne, 331. (1917)
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