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Leersia oryzoides
RICE CUTGRASS

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: LeersiaView Description 

Common Name: CUTGRASS
Habit: Perennial herb from long rhizomes. Stem: generally 1, decumbent to erect. Leaf: cauline; ligule membranous; blade flat to folded. Inflorescence: panicle-like, open; lateral branchlets, spikelet stalks arched to wavy. Spikelet: laterally compressed; glumes 0; floret 1, bisexual, falling as 1 unit; lemma, palea firmly membranous; lemma strigose on back, awnless, 5-veined; palea +- = lemma.
Species In Genus: 17 species: tropics, warm temperate America, Eurasia. Etymology: (J.D. Leers, German botanist, 1727--1774)
eFlora Treatment Author: Dieter H. Wilken

Leersia oryzoides (L.) Sw.
NATIVE
Stem: 1--1.5 m; nodes short, soft-hairy. Leaf: sheath glabrous to minutely scabrous; ligule +- 1 mm, truncate; blade 10--28 cm, 8--14 mm wide, margin strongly scabrous, with downward-pointing teeth. Inflorescence: 12--20 cm; lower branches +- spreading. Spikelet: 4--5 mm, oblong to narrowly elliptic; lemma 4--5 mm, width 3--5 × palea width. Chromosomes: 2n=48.
Ecology: Marshes, streams, ponds; Elevation: < 1200 m. Bioregional Distribution: CA-FP (exc CW); Distribution Outside California: to British Columbia, eastern North America; Eurasia. Flowering Time: Aug--Oct Note: Lateral inflorescences enclosed by sheath, generally cleistogamous. Leersia hexandra Sw., with ascending to appressed inflorescence branches, smaller spikelets, has been reported, but not documented, in rice fields in ScV.
eFlora Treatment Author: Dieter H. Wilken
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botanical illustration including Leersia oryzoides

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Citation for this treatment: Dieter H. Wilken 2016. Leersia oryzoides, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=30431, accessed on February 08, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on February 08, 2016.


Leersia oryzoides
click for enlargement
© 2008 Keir Morse
Leersia oryzoides
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© 2011 Steve Matson
Leersia oryzoides
click for enlargement
© 2011 Steve Matson
Leersia oryzoides
click for enlargement
© 2011 Steve Matson
Leersia oryzoides
click for enlargement
© 2008 Keir Morse
Leersia oryzoides
click for enlargement
© 2008 Keir Morse

More photos of Leersia oryzoides in CalPhotos


Geographic subdivisions for Leersia oryzoides:
CA-FP (exc CW);
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.