Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

  • Up-to-date information about California vascular plants is available from the Jepson eFlora.



Raymond Cranfill, except as specified

Annual or perennial herb, often rhizomed, often of wet open places, generally monoecious; roots fibrous, hairy
Stem generally 3-sided
Leaves often 3-ranked; sheath generally closed; ligule generally 0; blade (0) various, parallel-veined
Inflorescence: spikelets variously clustered; flowers generally sessile in axil of flower bract
Flower small, generally wind-pollinated; perianth 0 or bristle-like; stamens generally 3, anthers attached at base, 4-chambered; ovary superior, 1-chambered, 1-ovuled, style 2–3-branched
Fruit: achene, generally 3-sided
Genera in family: ± 110 genera, 3600 species: worldwide, especially temp
Reference: [Tucker 1987 J Arnold Arbor 68:361–445]
Difficult: taxa differ in technical characters of inflorescence and fruit.


Annual or perennial herb, cespitose
Stem round, slender, solid, ridged and grooved
Leaves several, basal; bases sheathing, margins wide, scarious; blades 0 to linear, flat, folded, or upcurled
Inflorescence: spikelets in terminal, panicle-like clusters; flower bracts spiraled, deciduous
Flowers bisexual; perianth bristles 0; stamens generally 3; style 2–3-branched, generally fringed below branches, widest at base, deciduous
Fruit 2–3-sided or round, surface cells ± square or horizontally elongate
Species in genus: ± 200 species: worldwide
Etymology: (Latin: fringed style)
Reference: [Kral 1971 Sida 4:57–227]


F. thermalis S. Watson


Perennial < 15 dm, rhizomed
Stem > leaf, round below, flat above
Leaves spiraled; blades linear, flat or ± upcurled
Inflorescence: spikelet generally long-peduncled, elongate, tip acute; flower bracts densely hairy, fruiting bracts narrowly ovate, pale brown, midrib greenish, exserted, tip acute
Flower: style 2-branched
Fruit ± 1.5 mm, obovate, 2-sided, dark brown, shiny
Chromosomes: 2n=20
Ecology: Wet, alkaline soils, generally near hot springs
Elevation: > 500 m.
Bioregional distribution: White and Inyo Mountains, Mojave Desert
Distribution outside California: s Nevada, Arizona
Flowering time: Aug–Sep
Synonyms: F. spadicea (L.) M. Vahl misapplied
Like F. caroliniana (Lam.) Fernald of se US.
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for FIMBRISTYLIS%20thermalis being generated

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