Fimbristylis thermalis

S. Watson

Botany (Fortieth Parallel), 360. 1871.

Illustrated
Treatment appears in FNA Volume 23. Treatment on page 124. Mentioned on page 121, 123.
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Plants perennial, robust, 50–150 cm, cespitose or with culms solitary; rhizomes scaly, slender, elongate. Leaves nearly distichous, spreading to ascending, 1/2 length of culms; sheath margins entire, backs smooth to pubescent; ligule present, complete; blades narrowly linear, proximally flat, 2–3.5 (–4) mm wide, margins scabridciliate, abaxial surface sometimes pubescent. Inflorescences: anthelae simple or compound, longer than wide; scapes wandlike, nearly terete or slightly compressed, distally 1 mm thick, marginal ribs scabrid; longest primary involucral-bract shorter than panicle. Spikelets pale dull brown, lanceovoid to cylindric-ellipsoid, 10–12 mm; fertile scales ovate, 3.5–4 mm, apex broadly acute, ciliate, surface uniformly puberulent, midrib excurrent as mucro or cusp. Flowers: stamens 3; styles 2-fid, flat, fimbriate. Achenes dark-brown, lenticular-obovoid, 1.5 mm, finely cancellate, with 20 or more longitudinal rows of horizontally rectangular pits per side. 2n = 20.


Phenology: Fruiting spring–fall.
Habitat: Mineralized sands of hot springs, alkaline seep meadows
Elevation: 300–600 m

Distribution

V23 188-distribution-map.jpg

Ariz., Calif., Nev., Utah, Mexico (Baja California), Mexico (Coahuila)

Discussion

Selected References

None.

Lower Taxa

None.

"shortened" is not a number."/2lengthofculms" is not declared as a valid unit of measurement for this property.

... more about "Fimbristylis thermalis"
reticulate-honeycombed +
lenticular-obovoid +
compound +  and simple +
longer than wide +
Robert Kral +
S. Watson +
smooth;pubescent +
deciduous +
enlarged +
keeled +, terete +, folded +  and flat +
0.2 cm2 mm <br />0.002 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
parallel +  and divergent +
terete +, rolled +  and plicate +
3-5-angled +, compressed +  and terete +
Ariz. +, Calif. +, Nev. +, Utah +, Mexico (Baja California) +  and Mexico (Coahuila) +
300–600 m +
hypogynous +  and subtending +
biconvex +  and trigonous +
Mineralized sands of hot springs, alkaline seep meadows +
interrupted +  and continuous +
compound +  and simple +
erect +  and spreading +
spreading;ascending +
with (1-)3-6(-30) bristles and/or scales +
Fruiting spring–fall. +
2-3(-4)-carpellate +
rectangular +
3 (?) +  and 1 (?) +
Botany (Fortieth Parallel), +
adventitious +
basal +  and proximal +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
compressed +, terete +  and wand-like +
1 cm10 mm <br />0.01 m <br /> (?) +
cylindric +
Illustrated +
brown +  and pale +
single +, 1 +  and 80 +
lanceovoid;cylindric-ellipsoid +
1 cm10 mm <br />0.01 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
fimbriate +  and 2-fid +
Fimbristylis thermalis +
Fimbristylis +
species +
not +  and rhizomatous +
plant +, with culms +  and cespitose +