Fimbristylis thermalis |
Fimbristylis puberula |
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hot springs fimbristylis, hot springs fimbry |
hairy fimbry |
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Habit | Plants perennial, robust, 50–150 cm, cespitose or with culms solitary; rhizomes scaly, slender, elongate. | Plants perennial, mostly loosely cespitose, to 100 cm, bases swollen; rhizomes short, knotty, or scaly, slender, contorted. | ||||
Culms | sometimes solitary, narrowly linear, distally angular, glabrous. |
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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. |
ascending, from 1/3 as long to equally as long as culms, glabrous to pubescent; sheaths apically ciliate; ligule essentially absent or (in rhizomatous individuals) present, complete or incomplete; blades narrowly linear, 1–2 mm wide, mostly strongly involute, scabrid-ciliate. |
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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. |
anthelae simple or compound, compact or diffuse, mostly broad, ascending-branching; scapes slender, wandlike, 1 mm thick; lower leafy involucral bracts exceeded by or exceeding panicle. |
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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. |
variously red-brown, broadly ovoid to lance-cylindric, 5–10 mm; fertile scales broadly ovate, obtuse or obtuse-angled, 2.5–3.5 mm, abaxially glabrous or variously puberulent, midrib excurrent as mucro. |
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Flowers | stamens 3; styles 2-fid, flat, fimbriate. |
stamens 3; styles 2-fid, flat, fimbriate. |
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Achenes | dark brown, lenticular-obovoid, 1.5 mm, finely cancellate, with 20 or more longitudinal rows of horizontally rectangular pits per side. |
yellowish to dark brown, lenticular-obovoid, 1 mm, with 11–20 vertical lines of horizontally rectangular or isodiametric, distinct or indistinct pits. |
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2n | = 20. |
= 20. |
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Fimbristylis thermalis |
Fimbristylis puberula |
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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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AL; AR; AZ; DE; FL; GA; IL; IN; KS; KY; LA; MD; MI; MO; MS; NC; NE; NJ; NM; NY; OH; OK; SC; TN; TX; UT; VA; ON
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Discussion | Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 23, p. 124. | FNA vol. 23. | ||||
Parent taxa | Cyperaceae > Fimbristylis | Cyperaceae > Fimbristylis | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Scirpus puberulus | |||||
Name authority | S. Watson: Botany (Fortieth Parallel), 360. (1871) | (Michaux) Vahl: Enum. Pl. 2: 289. (1805) | ||||
Web links |