Northern Prairie Wildlife Research Center
Western Wetland Flora
Field Office Guide to Plant Species
Weak Manna Grass
Puccinellia pauciflora (J. Presl) Munz
- Family: Grass (Gramineae)
- Flowering: June-August
- Field Marks: This Puccinellia has rhizomes and is the only species in the genus with conspicuously nerved lemmas. The leaves are very wide, sometimes as much as 3/4 inch wide.
- Habitat: Along streams, marshes, often in standing water.
- Habit: Perennial herb with stout rhizomes.
- Stems: Spreading at first but becoming upright, unbranched, hollow, up to 4 feet tall, smooth; sheaths on stems with cross-markings.
- Leaves: Elongated, flat, up to 3/4 inch wide, without hairs but usually slightly rough to the touch.
- Flowers: Borne in spikelets, the spikelets arranged in open panicles up to 10 inches long, the branches of the panicle ascending, spreading, or pointing downward.
- Sepals: 0.
- Petals: 0.
- Stamens: 3.
- Pistils: Ovary superior, smooth.
- Grains: Oblongoid, smooth.
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