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Trisetum canescens

TALL FALSE OAT


Higher Taxonomy
Family: Poaceae (Gramineae)View DescriptionDichotomous Key
Common Name: GRASS FAMILY
Habit: Annual to woody perennial herb; roots generally fibrous. Stem: generally round, hollow; nodes swollen, solid. Leaf: alternate, 2-ranked, generally linear, parallel-veined; sheath generally open; ligule membranous or hairy, at blade base. Inflorescence: various (of generally many spikelets). Spikelet: glumes generally 2; florets (lemma, palea, flower) 1--many; lemma generally membranous, sometimes glume-like; palea generally +- transparent, +- enclosed by lemma. Flower: generally bisexual, minute; perianth vestigial; stamens generally 3; stigmas generally 2, generally plumose. Fruit: grain, sometimes achene- or utricle-like.
Genera In Family: 650--900 genera; +- 10550 species: worldwide; greatest economic importance of any family (wheat, rice, maize, millet, sorghum, sugar cane, forage crops, ornamental, weeds; thatching, weaving, building materials). Note: Generally wind-pollinated. Achnatherum, Ampelodesmos, Hesperostipa, Nassella, Piptatherum, Piptochaetium, Ptilagrostis moved to Stipa; Elytrigia, Leymus, Pascopyrum, Pseudoroegneria, Taeniatherum to Elymus; Hierochloe to Anthoxanthum; Lolium, Vulpia to Festuca; Lycurus to Muhlenbergia; Monanthochloe to Distichlis; Pleuraphis to Hilaria; Rhynchelytrum to Melinis. The following taxa (in genera not included here), recorded in California from historical collections or reported in literature, are extirpated, lacking vouchers, or not considered naturalized: Acrachne racemosa (Roth) Ohwi, Allolepis texana (Vasey) Soderstr. & H.F. Decker, Amphibromus nervosus (Hook. f.) Baill., Axonopus affinis Chase, Axonopus fissifolius (Raddi) Kuhlm., Coix lacryma-jobi L., Cutandia memphitica (Spreng.) K. Richt., Dinebra retroflexa (Vahl) Panz., Eremochloa ciliaris (L.) Merr., Eustachys distichophylla (Lag.) Nees, Gaudinia fragilis (L.) P. Beauv., Miscanthus sinensis Andersson, Neyraudia arundinacea (L.) Henrard, Phyllostachys aurea Rivière & C. Rivière, Phyllostachys bambusoides Siebold & Zuccarini, Rottboellia cochinchinensis (Lour.) Clayton, Schedonnardus paniculatus (Nutt.) Branner & Coville, Schizachyrium cirratum (Hack.) Wooton & Standl., Schizachyrium scoparium (Michx.) Nash, Themeda quadrivalvis (L.) Kuntze, Thysanolaena latifolia (Hornem.) Honda, Tribolium obliterum (Hemsl.) Renvoize, Zea mays L., Zizania palustris L. var. interior (Fassett) Dore, Zoysia japonica Steud. Paspalum pubiflorum E. Fourn., Paspalum quadrifarium Lam., are now reported for southern California (J Bot Res Inst Texas 4:761--770). See Glossary p. 30 for illustrations of general family characteristics.
eFlora Treatment Author: James P. Smith, Jr., except as noted
Scientific Editor: James P. Smith, Jr., J. Travis Columbus, Dieter H. Wilken.
Genus: TrisetumView DescriptionDichotomous Key


Habit: Annual, perennial herb. Stem: ascending to erect, generally clumped. Leaf: generally basal and cauline; ligule membranous, obtuse to truncate, toothed, tip ciliate or not; blade flat to inrolled. Inflorescence: panicle- to spike-like, open to compact, cylindric to narrowly conic. Spikelet: glumes +- unequal, generally <= lower floret, keeled, acute, lower 1-veined, upper 3-veined; axis stiff- to soft-hairy, generally prolonged behind upper floret, bristly or with vestigial floret; florets 2--3, bisexual, breaking above glumes and between florets (sometimes below glumes); callus short-hairy; lemma +- keeled, tip 2-bristled or not, awned on back near tip or not, awn straight or wavy to bent; palea = or < lemma; ovary glabrous or with short, stiff hairs at tip.
Etymology: (Latin: 3 bristles, from its 3-awned lemma) Note: Some species intergrade; needs study in western North America. Trisetum flavescens (L.) P. Beauv. extirpated, last collected in California 1917.
eFlora Treatment Author: Robert E. Preston & Dieter H. Wilken
Reference: Rumely 2007 FNANM 24:744--753
Unabridged Reference: Finot et al. 2006 Sida 21:1419--1453
Trisetum canescens Buckley
NATIVE
Habit: Perennial herb. Stem: 5--8 dm, clumped. Leaf: glabrous, scabrous, or sparsely hairy; ligule 1--4 mm; cauline blade 2--5(8) mm wide. Inflorescence: generally panicle-like, 6--20 cm, narrow, compact to open; lower branches ascending to erect; central axis generally exposed, sparsely hairy. Spikelet: generally on distal 2/3 of lower branches; glumes lanceolate, lower 3--5 mm, upper 6--7 mm, acute; lemma 4--6 mm, awn 6--11 mm; ovary with short, stiff hairs at tip. Chromosomes: 2n=28,42.
Ecology: Open to shaded sites, meadows, chaparral, conifer forest; Elevation: < 2830 m. Bioregional Distribution: NW, CaRH, SNH, CW, SnJt, MP; Distribution Outside California: to Alaska, Montana, Utah. Flowering Time: May--Aug Note: Some coastal populations with spike-like panicles; apparently intergrades with Trisetum cernuum outside of California.
Synonyms: Trisetum cernuum Trin. var. canescens (Buckley) Beal
Jepson eFlora Author: Robert E. Preston & Dieter H. Wilken
Reference: Rumely 2007 FNANM 24:744--753
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

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Citation for this treatment: Robert E. Preston & Dieter H. Wilken 2012, Trisetum canescens, in Jepson Flora Project (eds.) Jepson eFlora, https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=47326, accessed on December 03, 2024.

Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora, https://ucjeps.berkeley.edu/eflora/, accessed on December 03, 2024.

Trisetum canescens
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©2011 Steve Matson
Trisetum canescens
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©2008 Keir Morse
Trisetum canescens
click for image enlargement
©2011 Steve Matson
Trisetum canescens
click for image enlargement
©2008 Keir Morse
Trisetum canescens
click for image enlargement
©2011 Steve Matson

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Geographic subdivisions for Trisetum canescens:
NW, CaRH, SNH, CW, SnJt, MP
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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 occurrence).






 

Data provided by the participants of the  Consortium of California Herbaria.

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Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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CCH collections by month Flowering-Fruiting Monthly Counts

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time (fruiting time in some monocot genera).