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Key to families | Table of families and genera
Indexes to all accepted names and synonyms:
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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.
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). [Barkworth et al. 2003 FNANM:25; Barkworth et al. 2007 FNANM:24] 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. —Scientific Editors: James P. Smith, Jr., J. Travis Columbus, Dieter H. Wilken.
Unabridged references: [Hitchcock 1951 Manual grasses US, USDA Misc Publ 200; Clayton & Renvoise 1986 Kew Bull Add Series 13]
Key to Poaceae
1 sp.: native to Mediterranean, naturalized in similar climates worldwide. (J.B. Lamarck, French botanist, 1744–1829)
Annual, cespitose, glabrous. Stem: generally erect, 7–40 cm. Leaf: cauline, ± evenly distributed; ligule 3–7 mm, membranous, glabrous, tip ± irregularly cut; blade 2.5–9 cm, 2.5–7 mm wide, flat. Inflorescence: panicle-like, terminal, 2–8 cm, dense, golden yellow to ± purple; axis short-white-hairy in branch axils; spikelets short-stalked, with 1 fertile and 1–3 sterile spikelets in spreading to drooping clusters, each cluster generally falling as 1 unit. Fertile spikelet: glumes 2.5–4 mm, ± equal, generally = spikelet; florets 2; lower floret fertile, 2.5–3 mm, lemma awned from near tip, awn 6–7 mm, straight; upper floret sterile, ± 0.5 mm, awn 4–5 mm. Sterile spikelet: 6–9 mm, >> glumes, linear; glumes > lower floret; florets 5–8; lemmas ± overlapping, 1.5–2 mm, obtuse, tip ± fringed, awn 0 (stalk base sometimes with a reduced, sterile spikelet like fertile in size and shape).
n=7. Open ground, moist seeps, rocky hillsides, sandy soil; < 1250 m. Outer North Coast Ranges, Inner North Coast Ranges, Sierra Nevada Foothills, Tehachapi Mountain Area, Central Western California, Southwestern California; Arizona; native to Mediterranean. Somewhat weedy. Feb–May [Online Interchange]
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Next taxon: Leersia
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Sep 30 2014
Citation for this treatment: [Author of taxon treatment] 2013. Lamarckia, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=30147, accessed on Sep 30 2014
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© 2007 Neal Kramer
|Geographic subdivisions indicated for the distribution of Lamarckia aurea|| 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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(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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