Xyris montana |
Xyris torta |
|
---|---|---|
northern yellow-eyed-grass, xyris de montagne, xyris des montagnes |
common yelloweyed grass, slender yellow-eyed-grass |
|
Habit | Herbs, perennial, cespitose, 5–30 cm. | Herbs, perennial, cespitose or solitary, 15–80(–100) cm, base abruptly 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. |
ascending to erect, 20–50 cm; sheath base often reddened or pink; blade green, elongate-linear, twisted, 2–5 mm wide, smooth to papillate, with strongly raised veins, margins smooth or papillate. |
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, flexuous, 1–1.5(–2) mm wide, distally 5–6-ribbed, ribs smooth or papillate; spikes globose to ovoid, ellipsoid, lanceoloid, or cylindric, 8–25 mm, apex acute or blunt; fertile bracts 5–7 mm, margins entire except for red fimbriololation at rounded apex. |
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, strongly curved, 4.5–5.5 mm; keel firm, ciliate except for red-fimbriloolate tip; petals unfolding in morning, blade obovate, 4 mm; staminodes bearded. |
Seeds | translucent, narrowly ellipsoid, (0.6–)0.7–0.9(–1) mm, finely lined. |
translucent, ellipsoid, 0.5 mm, strongly ridged longitudinally with finer cross-lines. |
2n | = 18. |
|
Xyris montana |
Xyris torta |
|
Phenology | Flowering summer–fall. | Flowering late spring–fall. |
Habitat | Sphagnous bogs, poor fens, acid seeps, shores of glacial lakes, streams, muskegs, or floating bog mats | Sphagnous bogs, streambanks, pond shores, wet sandy swales, moist disturbed sites, various physiographic provinces |
Elevation | 0–500 m (0–1600 ft) | 100–1200 m (300–3900 ft) |
Distribution |
CT; MA; ME; MI; MN; NH; NJ; NY; PA; RI; VT; WI; NB; NF; NS; ON; QC
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AL; AR; CT; DE; GA; IA; IL; IN; KY; LA; MA; MD; MI; MN; MO; MS; NC; NH; NJ; NY; OH; OK; PA; RI; SC; TN; TX; VA; WI; WV
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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 Maine, Xyris torta is to be expected there. Xyris torta is the widest-ranging of all North American xyrids and the most expressive ecologically; thus it is not surprising that it varies so much morphologically. It is much ofthen confused in older nomenclature literature with X. caroliniana. Xyris torta is the type species for the genus. (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 | Kotsjelottia flexuosa, X. bulbosa |
Name authority | Ries: Bulletin of the Torrey Botanical Club 19: 38. (1892) | Smith: in A. Rees, The Cyclopaedia 39: Xyris no. 11. (1819) |
Web links |