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Muhlenbergia mexicana

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: MuhlenbergiaView DescriptionDichotomous Key

Common Name: MUHLY
Habit: Annual, perennial herb, occasionally mat-like, often rhizomed. Stem: decumbent to erect, +- clumped. Leaf: basal and cauline; sheath open; ligule membranous, entire to irregularly toothed, occasionally with 1 large tooth on each side; blade flat to rolled. Inflorescence: panicle-like, narrow to open; branches spreading to appressed. Spikelet: generally single (bisexual) occasionally paired (bisexual, staminate or sterile); glumes subequal, generally 1--3-veined, short-pointed to awned, upper glume occasionally 3-veined; florets 1, occasionally 2; axis breaking above glumes; lemma short-pointed to awned, glabrous to hairy, 3-veined; palea <= lemma. Fruit: +- fusiform, red-brown, generally falling with lemma and palea.
Species In Genus: 173 species: temperate America, southern Asia. Etymology: (G.H.E. Muhlenberg, Pennsylvania botanist, 1753--1815) Note: Reports of Muhlenbergia dumosa Vasey, Muhlenbergia glauca (Nees) B.D. Jacks., Muhlenbergia thurberi (Scribn.) Rydb. have proved to be erroneous.
eFlora Treatment Author: Paul M. Peterson

Muhlenbergia mexicana (L.) Trin.
NATIVE
Habit: Perennial herb; rhizomes scaly, creeping. Stem: 3--7 dm. Leaf: ligule 0.4--1 mm, truncate, irregularly toothed; blade 4--12 cm, 2--5 mm wide, flat. Inflorescence: 2--15 cm, 5--15 mm wide, narrow; branches stiffly ascending, densely flowered. Spikelet: glumes 1.5--3.5 mm, acuminate to short-awned, awn < 2 mm; lemma 1.8--3.4 mm, hairs at base < 1.5 mm, awn 2.5--9 mm; anther < 0.5 mm, yellow. Chromosomes: 2n=40.
Ecology: Uncommon. Riverbanks, canyons; Elevation: 60--1530 m. Bioregional Distribution: KR, NCoRO, n SN; Distribution Outside California: to British Columbia, eastern United States. Flowering Time: Jul--Aug
eFlora Treatment Author: Paul M. Peterson
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Citation for this treatment: Paul M. Peterson 2016. Muhlenbergia mexicana, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=34097, accessed on May 03, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 03, 2016.


Muhlenbergia mexicana
click for enlargement
© 2011 Steve Matson
Muhlenbergia mexicana
click for enlargement
© 2011 Steve Matson
Muhlenbergia mexicana
click for enlargement
© 2011 Steve Matson
Muhlenbergia mexicana
click for enlargement
© 2011 Steve Matson
Muhlenbergia mexicana
click for enlargement
© 2011 Steve Matson
Muhlenbergia mexicana
click for enlargement
© 2011 Steve Matson

More photos of Muhlenbergia mexicana in CalPhotos


Geographic subdivisions for Muhlenbergia mexicana:
KR, NCoRO, n SN;
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.