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Vascular Plants of California
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Glyceria ×occidentalis

Glyceria ×occidentalis (Piper) J.C. Nelson
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: Error CHECK eFlora Treatments
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Citation for this treatment: Error CHECK eFlora Treatments 2012, Glyceria ×occidentalis, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on July 16, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora,, accessed on July 16, 2019.