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Poa secunda
NEVADA BLUE 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: PoaView DescriptionDichotomous Key

Common Name: BLUE GRASS
Habit: Annual, perennial herb; some +- dioecious. Stem: 0.3--12 dm. Leaf: sheath open most of length to closed (best observed on upper stem leaf); ligule thin, flexible, without a rim of hairs; blade grooved above on both sides of midvein, flat, folded, or inrolled, generally smooth or scabrous on veins, generally prow-tipped. Inflorescence: panicle-like; branches appressed to drooping. Spikelet: generally compressed, breaking between florets; glumes 2, +- equal, generally < lowest lemma, awnless; florets generally 2--6; callus indistinct, often with obvious tuft of long cobwebby hairs; lemma generally keeled to base, like glumes, awnless, veins generally 5, hairy or glabrous, upper margins thin-membranous; palea well developed, keel generally scabrous. Flower: generally bisexual, sometimes pistillate and/or staminate; fertile anthers 0.2--4.5 mm; ovary glabrous; fruit firm.
Species In Genus: +- 500 species: temperate and cool regions. Etymology: (Greek: ancient name applied to various grasses, fodder plants) Note: California is center of diversity in North America. Spikelet data recorded from lowest florets of spikelet at 25 ×.
eFlora Treatment Author: Robert J. Soreng

Poa secunda J. Presl
NATIVE
Habit: Perennial herb, densely cespitose. Leaf: sheath open 3/4 length to near base; ligule 0.5--10 mm, truncate to acuminate, sometimes scabrous; blade generally 0.5--3 mm wide, soft to firm, flat to folded or inrolled. Inflorescence: 2--25 cm, often +- 1-sided, generally linear to lanceolate, generally dense; branches generally appressed to ascending (generally spreading only in flower), +- scabrous. Spikelet: +- cylindric or little compressed; upper internodes generally > 1.2 mm; callus glabrous or with a ring of short hairs; lemma 3.5--5 mm, weakly keeled to rounded across lower back, glabrous to +- evenly short-hairy across body (rarely soft-hairy only on veins), smooth to scabrous. Flower: anthers 1.5--3 mm. Chromosomes: 2n=42--106 (mostly high polyploids).
Note: Many ecological forms; subspecies tend to intergrade.
eFlora Treatment Author: Robert J. Soreng
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Citation for this treatment: Robert J. Soreng 2016. Poa secunda, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=38882, accessed on February 07, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on February 07, 2016.


Poa secunda subsp. juncifolia
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© 2008 Keir Morse
Poa secunda subsp. secunda
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© 2009 Keir Morse
Poa secunda subsp. secunda
click for enlargement
© 2008 Keir Morse
Poa secunda subsp. secunda
click for enlargement
© 2009 Keir Morse
Poa secunda subsp. secunda
click for enlargement
© 2008 Keir Morse
Poa secunda subsp. secunda
click for enlargement
© 2009 Keir Morse

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Geographic subdivisions for Poa secunda:
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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).

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Data provided by the participants of the Consortium of California Herbaria.
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Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.