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Richard's yelloweyed grass

Habit Herbs, annual, rarely biennial, cespitose or solitary, 10–100 cm.



erect or ascending in narrow fans, 5–60 cm;

sheaths straw-colored, light green, or brown, smooth;

blade green, linear, flattened, 2–5(–15) mm wide, smooth, margins smooth or papillate.


scape sheaths exceeded by principal leaves;

scapes linear, terete, distally oval, (0.5–)1–1.5(–2) mm wide, smooth, 1–2-ribbed, ribs papillate;

spikes ovoid to ellipsoid or cylindro-lanceoloid, 7–15(–25) mm, apex acute;

fertile bracts 5–7 mm, margins entire, apex rounded.


lateral sepals included, slightly curved, 5–7 mm, keel scarious, lacerate, thin;

petals unfolding in morning, blade obtriangular, 3 mm;

staminodes bearded.


translucent, ellipsoid, 0.4–0.5 mm, faintly ribbed.


= 18.

Xyris jupicai

Phenology Flowering summer–fall (all year south).
Habitat Moist sands, sandy peats of savannas, flatwoods, swales, shores, ditches, and roadsides, particularly in disturbed situations
Elevation 0–350 m (0–1100 ft)
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AL; AR; DE; FL; GA; LA; MD; MS; NC; NJ; OK; SC; TN; TX; VA; Mexico; Central America; South America; West Indies
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The widest-ranging of all New World Xyrids and the most ample ecologically, Xyris jupicai is a frequent invader of disturbed or fallow open wetlands within its extensive range. In the southeastern United States it frequently shares habitat with two other species of its complex, namely X. difformis var. difformis and X. laxifolia. It differs from both in its lack of red pigmentation, from X. difformis by its more erect leaves and narrower, less prominently ribbed scapes, and from X. laxifolia by its narrower leaves and scapes, shorter, narrower, paler spikes, and translucent (rather than mealy), shorter seeds. Nonetheless, some difficult "calls" arise since all three flower at the same time and occasional chance hybrids do form.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 22.
Parent taxa Xyridaceae > Xyris
Sibling taxa
X. ambigua, X. baldwiniana, X. brevifolia, X. caroliniana, X. difformis, X. drummondii, X. elliottii, X. fimbriata, X. flabelliformis, X. isoetifolia, X. laxifolia, X. longisepala, X. montana, X. platylepis, X. scabrifolia, X. serotina, X. smalliana, X. stricta, X. tennesseensis, X. torta
Synonyms X. anceps, X. arenicola, X. communis, X. gymnoptera, X. jupicae, X. jupicai var. brachylepis, X. macrocephala
Name authority Richard: Actes de la Societe d'Histoire Naturelle de Paris 1: 106. (1792)
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