Xyris laxifolia
Xyris caroliniana
laxleaf yelloweyed grass
Carolina yelloweyed grass
compact.
erect or ascending, 20–50 cm;
sheath base chestnut brown;
blade green, narrowly linear, twisted, 2–5 mm wide, compressed but fleshy, margins minutely tuberculate.
scape sheaths much exceeded by leaves;
scapes linear, wiry, flexuous, nearly terete, 1.2–1.5 mm wide, distally 1-ribbed, rib smooth or somewhat scabrous;
spikes ellipsoid to lanceoloid or cylindric, 10–30 mm, apex acute;
fertile bracts 5–10(–13) mm, margins entire or erose, apex rounded.
lateral sepals conspicuously exserted, tan to reddish brown, nearly straight, 13–15 mm (including long hairs), keel firm, apex long-fimbriate, fimbriae red;
petals unfolding in afternoon, blade obovate, 8–10 mm;
staminodes bearded.
translucent, cylindro-fusiform, 0.8–1 mm, with flat, longitudinal ribs.
= 18.
Xyris laxifolia
Xyris caroliniana
Varieties 2 (1 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
In Florida and the lower Gulf Coastal Plain west to Mississippi are paler-leaved, white-petaled examples that have been treated as Xyris flexuosa var. pallescens (C. Mohr) Barnhart. These indeed are always in uniform populations but differ in no other significant way from the species. Since from typical plants. Because some other Xyris have white-flowered morphs (particularly X. platylepis), these are regarded as too close to be distinguished as varieties. Populational studies are in order, however.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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