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Fimbristylis thermalis
HOT SPRINGS FIMBRISTYLIS

Higher Taxonomy
Family: CyperaceaeView DescriptionDichotomous Key

Common Name: SEDGE FAMILY
Habit: Annual, perennial herb, often rhizomed or stoloned, often of wet open places; roots fibrous; monoecious, dioecious, or flowers bisexual. Stem: generally 3-sided, generally solid. Leaf: generally 3-ranked; base sheathing, sheath generally closed, ligule generally 0; blade (0 or) linear, parallel-veined. Inflorescence: spikelets generally arranged in head-, spike-, raceme-, or panicle-like inflorescences; flower generally sessile in axil of flower bract, enclosed in a sac-like structure (perigynium) or generally not. Flower: unisexual or bisexual, small, generally wind-pollinated; perianth 0 or generally bristle like; stamens generally 3, anthers attached at base, 4 chambered; ovary superior, chamber 1, ovule 1, style 2--3-branched. Fruit: achene, 2--3 sided.
Genera In Family: +- 100 genera, 5000 species: especially temperate. Note: Difficult; taxa differ in technical characters of inflorescence, fruit. In Carex and Kobresia, what appear to be individual pistillate flowers in fact are highly reduced inflorescences (whether or not the same applies to staminate flowers is still under debate). In some other works (e.g., FNANM) these are called spikelets, and they are treated as being arranged in spikes. Here and in TJM (1993), what appear to be individual pistillate flowers are called pistillate flowers in Carex (and they are treated as being arranged in spikelets), but spikelets in Kobresia (and they are treated as being arranged into spikes). Though internally inconsistent, the approach here is consistent with traditional usage, and reflects a preference for character states that may be determined in the field. Molecular, morphological, and embryological evidence indicates that Eriophorum crinigerum is to be segregated to a new genus, as Calliscirpus criniger (A. Gray) C.N. Gilmour et al., along with a second, newly described species, Calliscirpus brachythrix C.N. Gilmour et al. (Gilmour et al. 2013); key to genera modified by Peter W. Ball to include Calliscirpus.
eFlora Treatment Author: S. Galen Smith, except as noted
Scientific Editor: S. Galen Smith, Thomas J. Rosatti, Bruce G. Baldwin.
Genus: FimbristylisView DescriptionDichotomous Key

Habit: Annual, perennial herb, scapose, rhizomed or not. Stem: +- cylindric or flat, often prominent-ridged, <= 1 mm diam. Leaf: several, basal, spiraled, flower stem with 1+ cauline; blade flat proximally, longest > sheath, <= 4 mm wide; sheath distally open, margin scabrous, tip hairs << 1 mm, stiff; ligule 0 or of short hairs. Inflorescence: 1, terminal, branched or head-like, inflorescence bracts (1)2--8; spikelets (1)80+, cylindric [(flat)]; flower bracts 8--100, spiraled, each with 1 flower in axil or occasionally 0 in proximal 1--2, membranous, glabrous or puberulent, tip entire, mucronate, or short-awned. Flower: bisexual; perianth 0; style often flat, 2[3]-branched, base enlarged, not persistent. Fruit: 2--3-sided, wide-obovate, minute-netted-honeycombed, occasionally warty, brown or +- white, mucronate.
Species In Genus: 100+ species: warm temperate to tropics. Etymology: (Latin: fimbria, fringe, and stylus, style) Note: Fimbristylis miliacea record (1866) undocumented for California.

Fimbristylis thermalis S. Watson
NATIVE
Habit: Perennial herb 50--150 cm, rhizomed. Stem: +- 1 mm diam. Leaf: puberulent or scabrous; blade <= 4 mm wide; sheath often puberulent; ligule of short hairs. Inflorescence: branched; longest inflorescence bract < inflorescence; spikelet (5)10--12 mm, 3--5 mm wide; flower bract 3.5--4 mm, ovate, not keeled, puberulent. Flower: anther +- 1 mm; style 2-branched, flat, base enlarged, distally markedly widened, margin including branches dense-hairy. Fruit: +- 1.5 mm, 2-sided, brown, fine-pitted, angles prominent. Chromosomes: 2n=20.
Ecology: Wet mineralized soils near hot springs and in seepage meadows; Elevation: 110--1340 m. Bioregional Distribution: SCoRO, SnGb, SnBr, W&I, DMoj; Distribution Outside California: southern Nevada, Utah, Arizona, Mexico. Flowering Time: Jul--Sep
eFlora Treatment Author: S. Galen Smith
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Listed on CNPS Rare Plant Inventory

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Citation for this treatment: S. Galen Smith 2016. Fimbristylis thermalis, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=25947, accessed on February 13, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on February 13, 2016.


Fimbristylis thermalis
click for enlargement
© 2010 Steve Matson
Fimbristylis thermalis
click for enlargement
© 2004 Steve Matson
Fimbristylis thermalis
click for enlargement
© 2010 James M. Andre
Fimbristylis thermalis
click for enlargement
© 2010 Steve Matson
Fimbristylis thermalis
click for enlargement
© 2010 James M. Andre
Fimbristylis thermalis
click for enlargement
© 2004 Steve Matson

More photos of Fimbristylis thermalis in CalPhotos


Geographic subdivisions for Fimbristylis thermalis:
SCoRO, SnGb, SnBr, W&I, DMoj;
Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.