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hairy sweetgrass, vanilla grass

Habit Plants perennial, 40–85(110)cm tall; loosely cespitose, rhizomes 0.7–2 mm thick.
Leaves

blades to 25 cm on sterile shoots; much reduced on culms, 2.5–5.5 mm wide, narrowed at the base; dorsal surfaces glabrous and shiny; ventral surfaces hairy; flag leaves 1–3(6)cm × 3–4.5 mm.

Inflorescences

(5)7.5–15 cm; open.

Spikelets

4–6.3 mm.

Glumes

4–6.3 mm; ovate, exceeding the florets, glabrous; hyaline and more or less transparent, white to light brown, tinged with green or purple on the back near the base.

Lemmas

lower lemmas staminate, 3–5 × 1.1–1.5 mm; length/width ratio usually less than 4; more or less hairy all over, with hairs 0.5–1 mm on margins; to 0.5 mm toward the tips;

tips acute to awned, awns of lower lemmas 0.1–1 mm; upper lemmas bisexual, 2.9– 3.5 mm; shiny; hard; hairy distally; the hairs 0.5–1 mm and with bases strongly divergent from the lemma surface; acute.

Anthers

1.6–2.1 mm in lower, staminate florets, 1.2–1.3 mm in upper; bisexual florets.

Hierochloe odorata

Distribution
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[BONAP county map]
Discussion

Wet meadows and freshwater marshes. 600–2200m. BW, Casc, ECas, Sisk. CA, ID, NV, WA; north to AK, east to Greenland; northeastern US. Native.

Hierochloë odorata is recognized by its more or less round spikelets with almost transparent glumes surrounding hairy brown lemmas. Its culm leaves are disproportionately small. It is very similar to H. occidentalis, which has broader leaves, longer flag leaves, and more open panicles.

Source Flora of Oregon, volume 1, page 421
Barbara Wilson
Sibling taxa
H. occidentalis, H. odorata
Synonyms Anthoxanthum hirtum, Anthoxanthum nitens ssp. nitens
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