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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
Annual, perennial herb, generally cespitose. Stem: solid, generally glabrous. Leaf: generally basal; ligule generally < 1 mm, generally hairy; blade flat to inrolled, adaxial surface generally puberulent or short-hairy, often ciliate near ligule, hairs long, bulbous-based. Inflorescence: generally panicle-like; branches spike-like, 1 per node, persistent or deciduous in fruit; spikelets 2-rowed on 1 side of axis, overlapping. Spikelet: sessile or short-stalked, ± cylindric to laterally compressed; glumes generally unequal, generally lanceolate, 1-veined, upper glume firmer than lower; axis (if inflorescence branch persistent) breaking between glumes and lower floret; florets generally 2–3, lower floret bisexual, > upper, upper floret(s) generally reduced, sterile; lemma 3-veined, generally 3-awned, awns straight, scabrous; palea ± = lemma.Key to Bouteloua
57 species: America. (Claudio (b. 1774) and Esteban (b. 1776) Boutelou, Spanish botanists, horticulturists) [Columbus 1999 Aliso 18:61–65] Many species important for forage.
Perennial herb, sometimes rhizomed. Stem: generally erect, 2–9 dm. Leaf: blade < 25 cm, < 4 mm wide. Inflorescence: branches 13–60, 5–20 mm, generally pendent, deciduous in fruit; branch axis slightly prolonged beyond terminal spikelet node, base puberulent; spikelets 1–8 per branch, ascending to appressed, falling with branch. Spikelet: upper glume 4–8 mm, glabrous or scabrous, acute or awned < 0.5 mm; florets 1–2; lower floret lemma < to ± = upper glume, glabrous or sparsely hairy, lobes 0, awns 2, lateral, < 2 mm; base of upper floret (if present) glabrous, tip 2-lobed, central awn from sinus, < 6 mm, lateral awns < 4 mm.
2n=20,28,35,40–103. Dry, rocky slopes, crevices, sandy to rocky drainages, scrub, woodland; < 1900 m. s Sacramento Valley (Yolo Co. as roadside waif), e Peninsular Ranges, e&s Desert Mountains, sw Sonoran Desert; to southern Canada, eastern United States, southern Mexico, South America. If recognized taxonomically, plants with erect stems, rhizomes 0 assignable to Bouteloua curtipendula var. caespitosa Gould & Kapadia. Apr–Nov [Online Interchange]
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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 23 2015
Citation for this treatment: [Author of taxon treatment] 2013. Bouteloua, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=15975, accessed on May 23 2015
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|Geographic subdivisions indicated for the distribution of Bouteloua curtipendula|| 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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