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Orcuttia tenuis
SLENDER ORCUTT GRASS

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: OrcuttiaView DescriptionDichotomous Key

Habit: Annual, +- hairy. Stem: erect, becoming prostrate. Leaf: basal and cauline; collar 0; sheath and blade continuous; basal leaves long, floating when young, becoming dry and non-functional as aerial parts grow; cauline leaf blade flat or inrolled when dry. Inflorescence: generally spike-like, exserted; spikelets 2-ranked; axis breaking above glumes and between florets with age. Spikelet: laterally compressed; florets 4--40; glumes irregularly 2--5-toothed; lemma strongly 5-toothed, each tooth 1/3--1/2+ lemma, prominent central vein flanked by 2 weaker veins; palea < lemma; anthers white or +- pink, exserted, filaments slender, ribbon-like; stigma 1/3--1/2 style, +- sparsely short-hairy.
Species In Genus: 5 species: California, northern Baja California. Etymology: (C.R. Orcutt, California botanist, 1864--1929)
eFlora Treatment Author: John R. Reeder

Orcuttia tenuis Hitchc.
NATIVE
Habit: Plant generally with 1 main stem, sometimes weakly cespitose, sparsely hairy. Stem: generally erect, sometimes becoming decumbent, 5--15(25) cm, often branching in upper 2--10 cm. Leaf: blade 1.5--2 mm wide. Inflorescence: 5--10 cm, exserted with age; spikelets +- evenly spaced on axis. Spikelet: glumes 3--6 mm, subequal, 3--5-toothed, teeth < 1 mm; florets 5--20; lemma 4.5--6 mm, acute or with awn-tipped teeth, teeth +- equal, +- 1/2 lemma body, spreading or slightly recurved; palea slightly < lemma; anthers +- 3 mm. Fruit: +- 3 mm, narrowly oblong. Chromosomes: 2n=26.
Ecology: Vernal pools; Elevation: 200--1100 m. Bioregional Distribution: NCoRI (Lake Co.), CaR, ScV, MP. Flowering Time: May--Oct
eFlora Treatment Author: John R. Reeder
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Listed on CNPS Rare Plant Inventory

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Citation for this treatment: John R. Reeder 2016. Orcuttia tenuis, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=35382, accessed on May 06, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 06, 2016.


Orcuttia tenuis
click for enlargement
© 2011 Steve Matson
Orcuttia tenuis
click for enlargement
© 2005 George W. Hartwell
Orcuttia tenuis
click for enlargement
© 2009 George W. Hartwell
Orcuttia tenuis
click for enlargement
© 2011 Steve Matson
Orcuttia tenuis
click for enlargement
© 2005 George W. Hartwell
Orcuttia tenuis
click for enlargement
© 2009 George W. Hartwell

More photos of Orcuttia tenuis in CalPhotos


Geographic subdivisions for Orcuttia tenuis:
NCoRI (Lake Co.), CaR, ScV, MP.
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.