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.

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.
... more about "Fimbristylis thermalis"
reticulate-honeycombed +
lenticular-obovoid +
compound +  and simple +
longer than wide +
Robert Kral +
S. Watson +
shortened +
smooth;pubescent +
deciduous +
enlarged +
keeled +, terete +, folded +  and flat +
2mm;3.5mm +
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 +
1/2 length of culms +
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 +