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Vascular Plants of California
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Danthonia decumbens
MOUNTAIN HEATH GRASS


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: DanthoniaView DescriptionDichotomous Key


Common Name: OAT GRASS
Habit: Perennial herb, cespitose. Stem: erect. Leaf: generally basal and cauline; sheaths < internodes; ligule short, densely ciliate; blade narrow, flat to folded. Inflorescence: generally raceme-like (occasionally panicle-like or spikelet 1). Spikelet: +- laterally compressed; glumes +- equal, > florets, papery, 1--7-veined; florets 3--8, breaking above glumes and between florets; callus short-hairy; lemma rounded, (5)7--11-veined, tip 2-toothed, awn 0 or generally awned on back below teeth, awn generally bent, flat, coiled below bend, straight, +- cylindric above bend; palea = lemma; anthers 3. Fruit: elliptic.
Species In Genus: 20 species: warm temperate, tropics, America, Europe, northern Africa. Etymology: (É. Danthoine, French botanist, agrostologist, 1739--1794) Note: Danthonia pilosa R. Br. now treated as Rytidosperma. Variation, especially in Danthonia californica, and Danthonia unispicata, needs study. Danthonia purpurea L. f. [Karroochloa purpurea (L. f.) Conert & Türpe], grown at the Botanical Garden at Berkeley, but not naturalized.
eFlora Treatment Author: James P. Smith, Jr. & Kelly W. Allred
Reference: Darbyshire 2003 FNANM 25:301--306
Danthonia decumbens (L.) DC.
WAIF
Stem: 8--60 cm, generally erect, occasionally decumbent. Leaf: generally basal; sheath glabrous or hairy; blade 5--15 cm, 0.5--4 mm wide, glabrous or sparsely hairy. Inflorescence: raceme-like; branches erect. Spikelet: 1--15, 6--15 mm; glumes similar, generally 4--9 mm, 3--5-veined; fertile florets 4--6, reduced florets above, generally self-pollinated; lemma 5--6 mm, mucronate, 3--5-veined; awn 0. Chromosomes: 2n=24,36,124.
Ecology: Disturbed marshy sites; Elevation: < 10 m. Bioregional Distribution: NCo; Distribution Outside California: Washington, Oregon, Canada; native to Europe. Flowering Time: Jun--Jul Note: Sometimes treated as Sieglingia decumbens (L.) Bernh.
Synonyms: Sieglingia decumbens (L.) Bernh.
Unabridged Note: Report for Monterey Co. is based on a misidentification.
Jepson eFlora Author: James P. Smith, Jr. & Kelly W. Allred
Reference: Darbyshire 2003 FNANM 25:301--306
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Citation for this treatment: James P. Smith, Jr. & Kelly W. Allred 2012, Danthonia decumbens, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=22323, accessed on November 19, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on November 19, 2019.

No expert verified images found for Danthonia decumbens.



Geographic subdivisions for Danthonia decumbens:
NCo
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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.