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Erioneuron pilosum

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: ErioneuronView Description 

Habit: Perennial herb, tufted or mat-like, sometimes from short stolons. Stem: spreading to erect. Leaf: generally basal; ligule short-hairy; blade +- stiff, pointed. Inflorescence: raceme- or panicle-like, head-like, +- dense. Spikelet: laterally compressed; glumes +- equal, membranous, generally acuminate, glabrous, 1-veined; axis breaking apart above glumes and between florets; florets 4--20, lower bisexual, upper staminate or sterile; lemma wide, back rounded, generally densely soft-hairy below middle, 3-veined, tip 2-lobed or not, short-awned from tip or not; palea densely hairy below middle; stamens 1 or 3.
Species In Genus: 5 species: southwestern United States, Mexico, South America. Etymology: (Greek: woolly vein, from lemma, palea hairs) Note: Erioneuron pulchellum moved to Dasyochloa.
eFlora Treatment Author: Jesús Valdés-Reyna
Reference: Valdés-Reyna 2003 FNANM 25:44--46
Unabridged Reference: Tateoka 1961 Amer J Bot 48:565--573

Erioneuron pilosum (Buckley) Nash
Habit: Plant cespitose. Stem: erect, 1--3(4) dm. Leaf: sheath margin long-soft-hairy at collar; blade 3--6 cm, 1--1.5 mm wide, flat or folded, margin white. Inflorescence: raceme- or panicle-like, 1.5--4 cm, 1--2 cm wide, stalked and elevated above terminal leaf cluster. Spikelet: 1--1.5 cm; glumes 3--7 mm, tan or +- purple, awn 0; lemma 4--7 mm, tip minutely 2-toothed, awn 0.5--2.5 mm. Chromosomes: 2n=16.
Ecology: Rocky slopes, ridges, pinyon/juniper woodland; Elevation: 1280--2000 m. Bioregional Distribution: SNE, e DMtns; Distribution Outside California: to Kansas, Texas, Mexico. Flowering Time: May--Jun
Synonyms: Tridens pilosus (Buckley) Hitchc.;
eFlora Treatment Author: Jesús Valdés-Reyna
Reference: Valdés-Reyna 2003 FNANM 25:44--46
Unabridged Reference: Tateoka 1961 Amer J Bot 48:565--573
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botanical illustration including Erioneuron pilosum


Citation for this treatment: Jesús Valdés-Reyna 2012, Erioneuron pilosum, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on July 18, 2018.

Citation for the whole project: Jepson Flora Project (eds.) 2018, Jepson eFlora,, accessed on July 18, 2018.

Erioneuron pilosum
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© 2007 Steve Matson
Erioneuron pilosum
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© 2007 Steve Matson
Erioneuron pilosum
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© 2006 James M. Andre
Erioneuron pilosum
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© 2007 Steve Matson

More photos of Erioneuron pilosum in CalPhotos

Geographic subdivisions for Erioneuron pilosum:
SNE, e 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).

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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, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time.