Xyris brevifolia

Michaux

Flora Boreali-Americana 1: 23. 1803.

Illustrated
Synonyms: Xyris intermedia Malme
Treatment appears in FNA Volume 22.

Herbs, annual, cespitose, rarely solitary, (4–) 10–30 (–60) cm. Stems compact. Leaves in fans, 2–10 (–15) cm; sheath base greenish to pink; blade green or red-tinged, filiform to linear, 1–4 mm wide, smooth, margins smooth to papillate. Inflorescences: scape sheaths mostly exceeding leaves, blade prominent (in filiform-leaved extremes, overtopped by leaves); scapes wiry, nearly terete, 0.5–1 mm wide, low-ribbed apically; spikes oblate to globose or ovoid, mostly as broad as long, 5–7 (–10) mm, apex blunt; fertile bracts 3–6 mm, margins often squarrose, lacerate, scarious, with red inner band, apex broadly rounded. Flowers: lateral sepals included, slightly curved, 3–5 mm, keel firm, nearly entire to papillate or ciliolate, apex reddish; petals unfolding in morning, blade obovate, 2.5–3 mm; staminodes bearded. Seeds amber, broadly ellipsoid, 0.5 mm, finely lined. 2n = 18.


Phenology: Flowering spring–summer(–winter in the south).
Habitat: Acid, sandy, moist savanna and cleared areas
Elevation: 0–200 m

Distribution

V22 190-distribution-map.jpg

Ala., Fla., Ga., N.C., S.C., West Indies, South America (Brazil)

Discussion

Plants in south Florida and Cuba often have longer and narrower leaf blades than is typical, and G. O. K. Malme (1925) named Cuban material Xyris intermedia on the basis of longer, narrower leaf blades and entire sepal keels. In Florida, however, all of these characters intergrade. The red sepal tips, almost a homology with the bract dorsal area, are a constant (yet neglected) character. This species is often weedy.

Lower Taxa

None.

"thin" is not a number.

... more about "Xyris brevifolia"
Rounded (?) +  and Blunt (?) +
Robert Kral +
Michaux +
open +  and sheathing +
red-tinged +  and green +
ephemeral +
obovate +, filiform +  and linear +
0.25 cm2.5 mm <br />0.0025 m <br /> (?) +  and 0.3 cm3 mm <br />0.003 m <br /> (?) +
1mm;4mm +
Ala. +, Fla. +, Ga. +, N.C. +, S.C. +, West Indies +  and South America (Brazil) +
0–200 m +
basal-lateral +
proteinaceous +  and starchy +
loculicidal +
Acid, sandy, moist savanna and cleared areas +
moniliform +
margined +  and winged +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
equitant +, 2-ranked +  and alternate +
10 cm100 mm <br />0.1 m <br /> (15 cm150 mm <br />0.15 m <br />) +
2 cm20 mm <br />0.02 m <br /> (10 cm100 mm <br />0.1 m <br />) +
smooth +  and papillate +
lacerate +
distinct +
Flowering spring–summer(–winter in the south). +
monosulcate +
Flora Boreali-Americana +
malme1925a +
bladed +  and open +
0.5mm;1mm +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
ovoid +  and cylindric +
0.3mm +  and 1mm +
0.5 cm5 mm <br />0.005 m <br /> (?) +
connivent +  and opposite +
distinct +
unequal +
greenish +  and pink +
Illustrated +
0.7 cm7 mm <br />0.007 m <br /> (1 cm10 mm <br />0.01 m <br />) +
decussate +  and imbricate +
oblate;globose or ovoid +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
epipetalous +
branching +  and simple +
elongate +  and caudiciform +
funnel +  and u--shaped +
tubular +  and elongate +
Xyris intermedia +
Xyris brevifolia +
species +
herb +  and cespitose +