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Vascular Plants of California
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Desmazeria rigida

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: DesmazeriaView Description 

Habit: Annual. Stem: prostrate to erect, 1 to clumped. Leaf: basal and cauline; sheath open; ligule membranous, toothed at tip; blade flat to inrolled. Inflorescence: raceme- or panicle-like. Spikelet: subsessile to short-stalked; florets 5--25, bisexual, breaking above glumes and between florets; glumes +- equal, lower lanceolate, 1--3-veined, upper +- elliptic, 3-veined; lemma firmly membranous, acute to obtuse, 1--5-veined; palea < lemma.
Species In Genus: 6--7 species: Europe. Etymology: (J.B. Desmazières, French botanist, horticulturist, 1786--1862)
eFlora Treatment Author: Gordon C. Tucker
Unabridged Reference: Tucker 2007 FNANM 24:681--683
Desmazeria rigida (L.) Tutin
Stem: generally erect, 10--60 cm, glabrous. Leaf: blade 2--25 cm, 1--3 mm wide, flat, glabrous. Inflorescence: panicle-like, ovoid, 4--8(12) cm; branches, pedicels rigid, 3-angled; branches widely spreading. Spikelet: 4--10 mm, 2--5 borne on lower branches, lowest in axil; florets 5--12; glumes, lemmas generally glabrous; glumes 1--2.5 mm; lemmas spreading, 2--3 mm, translucent at acute to abruptly soft-pointed tip. Chromosomes: 2n=14.
Ecology: Open, often sandy sites; Elevation: < 700 m. Bioregional Distribution: s NCo, CCo, SnFrB, SCo, s ChI (Santa Catalina Island); Distribution Outside California: North America; native to southern and western Europe. Flowering Time: Apr--Sep
Synonyms: Scleropoa rigida (L.) Griseb.
Jepson eFlora Author: Gordon C. Tucker
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

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Citation for this treatment: Gordon C. Tucker 2012, Desmazeria rigida, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on June 27, 2022.

Citation for the whole project: Jepson Flora Project (eds.) 2022, Jepson eFlora,, accessed on June 27, 2022.

Desmazeria rigida
click for enlargement
© 2008 Steve Matson
Desmazeria rigida
click for enlargement
© 2008 Steve Matson
Desmazeria rigida
click for enlargement
© 2018 Neal Kramer
Desmazeria rigida
click for enlargement
© 2008 Steve Matson
Desmazeria rigida
click for enlargement
© 2018 Neal Kramer
Desmazeria rigida
click for enlargement
© 2018 Neal Kramer

More photos of Desmazeria rigida in CalPhotos

Geographic subdivisions for Desmazeria rigida:
s NCo, CCo, SnFrB, SCo, s ChI (Santa Catalina Island)
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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).


Data provided by the participants of the  Consortium of California Herbaria.
View all CCH records
All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.

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 (fruiting time in some monocot genera).