Xyris montana |
Xyris scabrifolia |
|
---|---|---|
northern yellow-eyed-grass, xyris de montagne, xyris des montagnes |
Harper's yelloweyed grass |
|
Habit | Herbs, perennial, cespitose, 5–30 cm. | Herbs, perennial, cespitose, occasionally solitary, 2–10(–11) dm, base bulbous to nearly bulbous. |
Stems | compact. |
compact. |
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. |
erect to ascending, 10–50 cm; sheaths pinkish, rugulose, papillate, or scabrous to nearly smooth, soft; blade dull green, linear, flattened, slightly to very twisted, 2.5–10 mm wide, smooth to papillate or scabrous, margins smooth to scabrous. |
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. |
scape sheaths exceeded by leaves; scapes linear, terete, to 2.5 mm wide, smooth to minutely scabrous, 2–4-ribbed distally, ribs papillate to minutely scabrous; spikes prevalently ovoid-ellipsoid, (7–)10–17(–20) mm; fertile bracts 6–8 mm, margins entire, apex rounded. |
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. |
lateral sepals included, slightly curved, 6–8 mm, keel scarious, lacerate to lacero-fimbriate; petals unfolding midday or afternoon, blade broadly obovate to nearly orbiculate, 3–5 mm; staminodes bearded. |
Seeds | translucent, narrowly ellipsoid, (0.6–)0.7–0.9(–1) mm, finely lined. |
translucent, ellipsoid-cylindric, 0.6–1 mm, longitudinally multiribbed with fainter cross ribs. |
2n | = 18. |
|
Xyris montana |
Xyris scabrifolia |
|
Phenology | Flowering summer–fall. | Flowering summer–fall. |
Habitat | Sphagnous bogs, poor fens, acid seeps, shores of glacial lakes, streams, muskegs, or floating bog mats | Sandy peats of deep pineland bogs and seeps, bog edges |
Elevation | 0–500 m (0–1600 ft) | 0–200 m (0–700 ft) |
Distribution |
CT; MA; ME; MI; MN; NH; NJ; NY; PA; RI; VT; WI; NB; NF; NS; ON; QC
|
AL; FL; GA; LA; MS; NC; TX |
Discussion | 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.) |
Although I have seen no records from South Carolina, Xyris scabrifolia is to be expected there. Several examples of what Bridges and Orzell have named Xyris chapmanii, together with a series of my own of this morph, show such intergradation that it is impossible to break the two out even as varieties. (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 | ||
Synonyms | X. flexuosa var. pusilla, X. papillosa | X. chapmanii |
Name authority | Ries: Bulletin of the Torrey Botanical Club 19: 38. (1892) | R. M. Harper: Bulletin of the Torrey Botanical Club 30: 325. (1903) |
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