Hierochloe odorata(synonym of Anthoxanthum hirtum) |
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hairy sweetgrass, vanilla grass |
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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 |
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Distribution | |
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 | |
Synonyms | Anthoxanthum hirtum, Anthoxanthum nitens ssp. nitens |
Web links |
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