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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
from FNA
AL; AR; FL; GA; LA; MS; NC; SC; TX; Mexico (Chiapas); Central America (Belize, Honduras, Nicaragua)
[WildflowerSearch map]
[BONAP county map]
from FNA
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)
[WildflowerSearch map]
[BONAP county map]
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
X. ambigua, X. brevifolia, X. caroliniana, X. difformis, X. drummondii, X. elliottii, X. fimbriata, X. flabelliformis, X. isoetifolia, X. jupicai, X. laxifolia, X. longisepala, X. montana, X. platylepis, X. scabrifolia, X. serotina, X. smalliana, X. stricta, X. tennesseensis, X. torta
X. ambigua, X. baldwiniana, X. brevifolia, X. caroliniana, X. difformis, X. drummondii, X. elliottii, X. fimbriata, X. flabelliformis, X. isoetifolia, X. jupicai, X. laxifolia, X. longisepala, X. montana, X. platylepis, X. scabrifolia, X. serotina, X. stricta, X. tennesseensis, X. torta
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)
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