Xyris laxifolia |
Xyris montana |
|
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laxleaf yelloweyed grass |
northern yellow-eyed-grass, xyris de montagne, xyris des montagnes |
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Habit | Herbs, perennial, cespitose, 5–30 cm. | |
Stems | compact. |
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Leaves | in narrow fans, 4–15 cm; sheaths reddish, soft, papillate; blade deep green, narrowly linear, 0.8–2(–3) mm wide, smooth, margins smooth to papillate. |
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Inflorescences | scape sheaths exceeded by leaves; scapes linear, wiry, terete, (0.25–)0.5–0.8(–1) mm wide, distally with 2–4 ribs, ribs papillate; spikes broadly to narrowly ellipsoid or ovoid, 4–8 mm; fertile bracts 3–4(–4.5) mm, margins erose or minutely fimbriolate, sometimes with narrow reddish border, apex very slightly to slightly keeled. |
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Flowers | lateral sepals slightly exserted, straight, 4.2–4.7 mm, keel scarious, entire or apically lacerate, apex red, narrow, firm; petals unfolding in morning, blade obovate, 3–4 mm; staminodes bearded. |
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Seeds | translucent, narrowly ellipsoid, (0.6–)0.7–0.9(–1) mm, finely lined. |
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Xyris laxifolia |
Xyris montana |
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Phenology | Flowering summer–fall. | |
Habitat | Sphagnous bogs, poor fens, acid seeps, shores of glacial lakes, streams, muskegs, or floating bog mats | |
Elevation | 0–500 m (0–1600 ft) | |
Distribution |
AL; AR; FL; GA; LA; MS; NC; SC; TN; TX; VA; Mexico; Central America; South America
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CT; MA; ME; MI; MN; NH; NJ; NY; PA; RI; VT; WI; NB; NF; NS; ON; QC
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Discussion | Varieties 2 (1 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Most or all known populations of this species fall within the boundaries of Wisconsin glaciation. The long stems (a trait not known for other North American species) are a response to the burial of the clump bases in deep sphagnum. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | Xyridaceae > Xyris | Xyridaceae > Xyris |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | X. flexuosa var. pusilla, X. papillosa | |
Name authority | Martius: Flora (Akureyri) 24(2 Beibl.):53. (1841) | Ries: Bulletin of the Torrey Botanical Club 19: 38. (1892) |
Web links |