Xyris baldwiniana |
Xyris smalliana |
|
---|---|---|
Baldwin's yelloweyed grass |
Small's yellow-eyed-grass |
|
Habit | Herbs, perennial, densely cespitose, 15–40(–50) cm. | Herbs, perennial, cespitose, 50–150 cm. |
Stems | compact. |
|
Leaves | erect or ascending, 10–30 cm; sheaths glossy light brown or red-brown, firm; blade green, linear to filiform, often angularly terete, or sulcate, rarely to 1mm wide. |
ascending in narrow fans, (19–)30–50(–60) cm; sheaths pinkish or pale red, soft, smooth; blade pale green proximally, distally deep lustrous green, linear, flattened, plane, 5–15 mm wide, margins smooth. |
Inflorescences | scape sheaths exceeded by leaves; scapes linear, straight or flexuous, terete, 1 mm wide, rarely 1-ribbed; spikes ovoid to ellipsoid, 4–7 mm, apex acute; fertile bracts 4–5 mm, margins entire or erose, apex rounded. |
scape sheaths exceeded by leaves; scapes linear, straight, distally slightly compressed, 1–2 mm wide, smooth, 2-ribbed; spikes ovoid to ellipsoid or cylindric, 10–20(–25) mm, apex usually blunt; fertile bracts 5–8 mm, margins entire, apex rounded. |
Flowers | lateral sepals included, reddish brown, slightly curved, less than 5 mm, keel scarious, lacerate from middle to tip; petals unfolding in morning, blade obovate, to 5 mm; staminodes beardless. |
lateral sepals slightly to conspicuously exserted, slightly curved, 6–8 mm, keel scarious, apex not red, broad, thin, lacerate; petals unfolding in afternoon, blade obovate, 5–6 mm; staminodes bearded. |
Seeds | translucent, fusiform to cylindric, (0.7–)0.8–1 mm, finely lined longitudinally. |
translucent, narrowly ellipsoid to ovoid, (0.6–)0.7(–0.8 mm), irregularly ridged and cross-ridged. |
2n | = 18. |
= 18. |
Xyris baldwiniana |
Xyris smalliana |
|
Phenology | Flowering late spring–fall. | Flowering summer–fall. |
Habitat | Moist to wet sands, sandy peats of bogs, pine savanna, ditches and low cleared areas, coastal plain | Sandy or peaty shallows and shores of ponds and sluggish acidic streams |
Elevation | 0–200 m (0–700 ft) | 0–100 m (0–300 ft) |
Distribution |
AL; AR; FL; GA; LA; MS; NC; SC; TX; Mexico (Chiapas); Central America (Belize, Honduras, Nicaragua)
|
AL; CT; DE; FL; GA; LA; MA; MD; ME; MS; NC; NH; NJ; NY; RI; SC; TX; West Indies (Cuba); Mexico (Tabasco); West Indies (Cuba); Central America (Belize, Honduras, Nicaragua)
|
Discussion | The beardless staminodes and the long, translucent seeds distinguish Xyris baldwiniana. Its leaf blades vary from terete to flat, and in eastern Texas and North Carolina the flat-leaved ones have been mistaken for X. elliottii. This same problem exists in Floridian narrow-leaved X. elliottii, which bears a strong resemblance to X. baldwiniana but has bearded staminodes and larger spikes. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Although no specimens were seen for Virginia, Xyris smalliana is to be expected there. (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. baldwiniana var. tenuifolia, X. juncea, X. setacea | X. caroliniana var. olneyi, X. congdonii, X. smalliana var. congdonii, X. smalliana var. olneyi |
Name authority | Schultes: in J. A. Schultes and J. H. Schultes, Mant. 1: 351. (1822) | Nash: Bulletin of the Torrey Botanical Club 22:159. (1895) |
Web links |