Glyceria melicaria |
Glyceria grandis |
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glycerie melicaire, melic mannagrass, northeastern manna grass |
American glyceria, American manna grass, manna grass, reed mannagrass, tall mannagrass |
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Habit | Plants perennial. | Plants perennial. | ||||
Culms | 50-100 cm tall, 3-5 mm thick, erect. |
50-150 (200) cm tall, 8-12 mm thick, erect or decumbent and rooting at the base. |
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Sheaths | smooth, not or only weakly keeled; ligules 0.2-0.9 mm, translucent, rounded to truncate; blades 25-40 cm long, 2-7 mm wide, abaxial surfaces smooth, adaxial surfaces scabridulous. |
smooth or scabridulous, keeled; ligules 1-5 (7) mm, truncate to rounded, ligules of the lower leaves stiff at the base, ligules of the upper leaves flexible throughout; blades 25-43 cm long, 4.5-15 mm wide. |
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Panicles | 15-25 cm long, 0.8-1.5 cm wide, linear, nodding; branches 5-9 cm, appressed, scarcely surpassing the node above, with 30-60+ spikelets; pedicels 0.5-2 mm. |
16-42 cm long, 12-20 cm wide, open; branches (7)10-18 cm, lax, widely divergent to drooping, with 35-80+ spikelets; pedicels 1-15 mm. |
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Spikelets | 3.5-5 mm long, 1-2.5 mm wide, laterally compressed, oval in side view, with 3-4 florets. |
3.2-10 mm long, 2-3 mm wide, somewhat laterally compressed, oval to elliptic in side view, with 4-10 florets. |
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Glumes | lanceolate, veins terminating below the apices, apices acute; lower glumes 1.3-2.4 mm; upper glumes 1.7-3 mm; rachilla internodes 0.4-0.6 mm; lemmas 1.9-2.8 mm, smooth or scabridulous, 5-7-veined, veins raised, apices acute, prow-shaped; paleas slightly shorter to slightly longer than the lemmas, lengths 2.5-4 times widths, keels well developed, not winged, tips incurved, narrowly notched between the keels; anthers 2, 0.3-0.5 mm. |
mostly hyaline, usually the midvein of 1 or both glumes extending to the apices, apices acute; lower glumes 1-2.3 mm; upper glumes 1.5-2.7 mm; rachilla internodes 0.5-0.8 mm; lemmas 1.8-3 mm, prominently (5)7-veined, veins often scabridulous, intercostal regions smooth, apices rounded to truncate, sometimes erose, almost flat at maturity; paleas from shorter than to slightly longer than the lemmas, lengths more than 3 times widths, keels not winged, ciliolate, tips not strongly incurved, truncate to notched between the keels; anthers 3, 0.5-1.2 mm. |
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Caryopses | 1-1.5 mm; hila subequal to the caryopses. |
1-1.5 mm. |
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2n | = 40. |
=20. |
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Glyceria melicaria |
Glyceria grandis |
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Distribution |
AL; CT; GA; KY; MA; MD; ME; MS; NC; NH; NJ; NY; OH; PA; RI; TN; VA; VT; WV; NB; NS; ON; QC
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AK; AZ; CA; CO; CT; DE; IA; ID; IL; IN; MA; MD; ME; MI; MN; MS; MT; NC; ND; NE; NH; NJ; NM; NV; NY; OH; OR; PA; RI; SD; TN; UT; VA; VT; WA; WI; WV; WY; AB; BC; LB; MB; NB; NS; NT; ON; PE; QC; SK; YT
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Discussion | Glyceria melicaria grows in swamps and wet soils. Its range extends from southeastern Ontario east to Nova Scotia, south to Illinois and the northeastern United States and, in the Appalachian Mountains, to northern Georgia. Glyceria xgatineauensis Bowden is a sterile hybrid between G. melicaria and G. striata. For further comments, see p. 77. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Glyceria grandis grows on banks and in the water of streams, ditches, ponds, and wet meadows, from Alaska to Newfoundland and south in the mountains to California, Arizona, and New Mexico in the western United States, and to Virginia and Tennessee in the eastern United States. It is similar to G. maxima, differing primarily in its shorter, flatter lemmas and shorter anthers. It is also confused with G. elata and Torreyochloa pallida. It differs from the former in having acute glumes with long veins, more evenly dark florets, flatter lemma apices, and paleal keel tips that do not point towards each other. It differs from Torreyochloa pallida in its closed leaf sheaths and 1-veined glumes. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 24, p. 75. | FNA vol. 24, p. 71. | ||||
Parent taxa | Poaceae > subfam. Pooideae > tribe Meliceae > Glyceria > sect. Striatae | Poaceae > subfam. Pooideae > tribe Meliceae > Glyceria > sect. Hydropoa | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | G. maxima subsp. grandis, G. grandis forma pallescens | |||||
Name authority | (Michx.) F.T. Hubb. | S. Watson | ||||
Web links |
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