Isolepis pseudosetacea

(Daveau) Gandoger

Cat. Pl. Espagne, 331. 1917.

Basionym: Scirpus pseudosetaceus Daveau Bol. Soc. Brot. 9: 86. 1891 (as pseudo-setaceus)
Synonyms: Isolepis molesta (M. C. Johnston) S. G. Smith Scirpus molestus M. C. Johnston
Treatment appears in FNA Volume 23. Treatment on page 138. Mentioned on page 139.
Revision as of 21:06, 16 December 2019 by FNA>Volume Importer

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.


Phenology: Fruiting spring–summer.
Habitat: Wet, freshwater, often drying, places in grasslands, open woods, limestone barrens, cultivated fields, waste places
Elevation: 0(–100) m

Distribution

V23 220-distribution-map.jpg

Ala., Ark., Ga., La., Miss., Mo., Tex., s Europe, n Africa.

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.

Selected References

None.

Lower Taxa

None.
... more about "Isolepis pseudosetacea"
S. Galen Smith +
(Daveau) Gandoger +
Scirpus pseudosetaceus +
Ala. +, Ark. +, Ga. +, La. +, Miss. +, Mo. +, Tex. +, s Europe +  and n Africa. +
0(–100) m +
Wet, freshwater, often drying, places in grasslands, open woods, limestone barrens, cultivated fields, waste places +
Fruiting spring–summer. +
Cat. Pl. Espagne, +
Illustrated +
Isolepis molesta +  and Scirpus molestus +
Isolepis pseudosetacea +
Isolepis +
species +