Fimbristylis thermalis |
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hot springs fimbristylis, hot springs fimbry |
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Habit | 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 scabrid-ciliate, 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, lance-ovoid 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. |
Fimbristylis thermalis |
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Phenology | Fruiting spring–fall. |
Habitat | Mineralized sands of hot springs, alkaline seep meadows |
Elevation | 300–600 m (1000–2000 ft) |
Distribution |
AZ; CA; NV; UT; Mexico (Baja California, Coahuila)
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Source | FNA vol. 23, p. 124. |
Parent taxa | Cyperaceae > Fimbristylis |
Sibling taxa | |
Name authority | S. Watson: Botany (Fortieth Parallel), 360. (1871) |
Web links |