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Koeleria macrantha

Higher Taxonomy
Family: Poaceae (Gramineae)View DescriptionDichotomous Key

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: KoeleriaView DescriptionDichotomous Key

Habit: Annual, perennial herb. Stem: erect. Leaf: basal to cauline; ligule membranous, glabrous to minutely ciliate, toothed at obtuse to truncate tip; blade narrow, flat to inrolled. Inflorescence: panicle-like, generally compact, narrow, or wider in full flower. Spikelet: laterally compressed; glumes unequal, upper > and wider than lower, keeled, acute, lower 1-veined, upper faintly 3--5-veined; axis prolonged beyond fertile floret, bristly (occasionally with vestigial floret at tip); florets 2--5, bisexual, breaking above glumes and between florets; lower lemmas generally > glumes, awned or not, 5-veined; palea +- < lemma, tip minutely 2-forked.
Species In Genus: +- 30 species: temperate North America, Eurasia. Etymology: (G.L. Koeler, German botanist, 1765--1807)
eFlora Treatment Author: Dieter H. Wilken

Koeleria macrantha (Ledeb.) Schult.
Habit: Cespitose. Stem: 2--8(10+) dm, glabrous to puberulent. Leaf: generally basal, tufted, glabrous to puberulent; ligule 1--2 mm; blade 2--20 cm, 1--2(3) mm wide, generally ridged. Inflorescence: 2--15 cm, 1--2 cm wide, cylindric to narrowly conic, or wider in full flower, interrupted at base. Spikelet: 4--6 mm, +- shiny, tan (occasionally +- purple); florets 2--4; lower glume +- 3 mm, upper +- 5 mm; lemma 3--5 mm, acute to small-pointed at tip. Chromosomes: 2n=14.
Ecology: Dry, open sites, clay to rocky soils, shrubland, woodland, conifer forest; Elevation: < 3840 m. Bioregional Distribution: NW, CaR, SN, ScV (Sutter Buttes), CW, TR, PR, GB, DMtns; Distribution Outside California: to Alaska, eastern Canada, central and eastern United States, northern Mexico, Eurasia. Flowering Time: May--Jul
Synonyms: Koeleria cristata Pers., superfl., in part; Koeleria cristata var. longifolia Burtt Davy; Koeleria gracilis Pers., illeg.; Koeleria nitida Nutt.; Koeleria pyramidata (Lam.) P. Beauv., misappl.
eFlora Treatment Author: Dieter H. Wilken
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botanical illustration including Koeleria macrantha


Citation for this treatment: Dieter H. Wilken 2017. Koeleria macrantha, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on October 17, 2017.

Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora,, accessed on October 17, 2017.

Koeleria macrantha
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© 2008 Keir Morse
Koeleria macrantha
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© 2012 Steve Matson
Koeleria macrantha
click for enlargement
© 2015 Steve Matson
Koeleria macrantha
click for enlargement
© 2008 Steve Matson
Koeleria macrantha
click for enlargement
© 2015 Steve Matson
Koeleria macrantha
click for enlargement
© 2008 Steve Matson

More photos of Koeleria macrantha in CalPhotos

Geographic subdivisions for Koeleria macrantha:
NW, CaR, SN, ScV (Sutter Buttes), CW, TR, PR, GB, DMtns;
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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).

View elevation by latitude chart
Data provided by the participants of the Consortium of California Herbaria.
View all CCH records

CCH collections by month

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