Jepson eFlora: Taxon page
Vascular Plants of California
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
Reference: Barkworth & Anderton 2007 FNANM 24:68--88
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
Jepson eFlora Author: Gordon Leppig
Reference: Barkworth & Anderton 2007 FNANM 24:68--88
Jepson Online Interchange

Previous taxon: Glyceria leptostachya
Next taxon: Glyceria striata

Name Search

Contact/Feedback

Citation for this treatment: Gordon Leppig 2012, Glyceria ×occidentalis, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=93855, accessed on September 17, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on September 17, 2019.

No expert verified images found for Glyceria ×occidentalis.



Geographic subdivisions for Glyceria ×occidentalis:
NW, n SNH, ScV, CCo, SnFrB
MAP CONTROLS
1. You can change the display of the base map and layers by clicking on the layer control box in the upper right-hand corner.
2. California county polygons can be turned off and on in the layer control box.
3. Filling of Jepson subdivision polygons can be turned off and on in the layer control box.
4. Moving the cursor over any numbered cluster will show the range boundary of the included specimens (with a blue polygon).
5. Marker clustering can be turned off by clicking this link:      Marker Clustering OFF
WARNING: Turning this off might cause maps with large numbers of specimens to load slowly.
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.
MAP LEGEND
View all CCH records
All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
READ ABOUT YELLOW FLAGS


CCH collections by month

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.