Jepson eFlora: Taxon page
Key to families | Table of families and genera
Previous taxon Index to accepted names and synonyms:
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
Next taxon
Glyceria ×occidentalis
WESTERN MANNA 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: GlyceriaView DescriptionDichotomous Key

Common Name: MANNA GRASS
Habit: Perennial herb from rhizomes (annual). Stem: generally rhizomatous, base decumbent, erect above, generally rooting at lower nodes. Leaf: sheath closed to near top; ligule thin, membranous, acute; blade flat or folded, only midrib prominent. Inflorescence: panicle-like, 15--50 cm, erect. Spikelet: glumes < lowest floret, margin translucent, 1-veined; axis breaking above glumes and between florets; florets 8--16; lemma strongly 5--11-veined, veins not converging, ending short of tip, tip margin translucent; palea +- = lemma, keel prominent, +- curved; anthers 2(3).
Species In Genus: +- 50 species: temperate worldwide, freshwater wetland and aquatic habitats. Etymology: (Greek: sweet, from taste of grain)
eFlora Treatment Author: Gordon Leppig

Glyceria ×occidentalis (Piper) J.C. Nelson
NATURALIZED
Habit: Perennial herb, often forming floating mats. Stem: 7--15 dm, 1.5--2 mm diam. Leaf: ligule 5--12 mm; blade 20--30 cm,(3)4--13 mm wide. Inflorescence: 15--40 cm, narrow; spikelets appressed. Spikelet: 15--20 mm, cylindric; lower glume 1.5--3.5 mm, upper 2.5--5 mm; florets 6--13; lemma 4.5--6 mm, tip entire to dentate or crenate; palea <= lemma. Chromosomes: n=20.
Ecology: Freshwater marshes, ponds and steams; Elevation: < 1300 m. Bioregional Distribution: NW, n SNH, ScV, CCo, SnFrB; Distribution Outside California: British Columbia, Idaho. Flowering Time: Jun--Aug Note: Taxonomic status and nativity are uncertain. Genetic evidence suggests this may be a hybrid of Glyceria leptostachya and Glyceria fluitans, see: Whipple et al. 2007 Amer J Bot 94:551--557.
Synonyms: Glyceria occidentalis
eFlora Treatment Author: Gordon Leppig
Jepson Online Interchange

Previous taxon: Glyceria leptostachya
Next taxon: Glyceria striata

Name Search

Contact/Feedback

Citation for this treatment: Gordon Leppig 2016. Glyceria ×occidentalis, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=93855, accessed on October 01, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on October 01, 2016.


Geographic subdivisions for Glyceria ×occidentalis:
NW, n SNH, ScV, CCo, SnFrB;
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
READ ABOUT YELLOW FLAGS
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).

View elevation by latitude chart
Data provided by the participants of the Consortium of California Herbaria.
View all CCH records

CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.