Rhynchospora colorata

(Linnaeus) H. Pfeiffer

Repert. Spec. Nov. Regni Veg. 38: 89. 1935.

Illustrated
Basionym: Schoenus coloratus Linnaeus Sp. Pl. 1: 43. 1753 Scirpus cephalotes Walter 1788
Synonyms: Dichromena cephalotes Britton Dichromena colorata (Linnaeus) Hitchcock Dichromena leucocephala Michaux Rhynchospora drummondiana Steudel
Treatment appears in FNA Volume 23. Treatment on page 215. Mentioned on page 201, 216.
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Plants perennial, cespitose or solitary, to 70 cm; rhizomes slender, scaly, to 2 mm thick. Culms erect, slender, leafybased, trigonous, several-ribbed. Leaves spreading to erect, overtopped by culm; blades narrowly linear, proximally flattened, 0.5–3 mm wide, apex tapering, trigonous. Inflorescences terminal, solitary, headlike, dense, white, leafyinvolucrate; involucral-bracts several, flaring to recurved, white from broadened base nearly to median, then green to tapered tip, longer bracts 13 cm × 2–7 mm. Spikelets white, ovoid, 5–7 mm, apex acute; fertile scales many, boatshaped, sharply curvedkeeled, 3–4 (–5) mm, apex acute or blunt. Flowers: perianth absent. Fruits several per spikelet, 1.5–1.7 (–2) mm; body yellow to mahogany, broadly pyriformobovoid, tumidly lenticular, 1 × 0.5–0.7 mm, widest at apex, margins thickened, interrupted at base of tubercle; surfaces transversely undulaterugose, ridges contiguous, of shortlinear papillae; tubercle broadly triangular, 0.5–0.6 mm, graycrustaceous, apex short acuminate. 2n = 12.


Phenology: Fruiting late spring–summer.
Habitat: Sands, peats, and silt of interdunal swales, shores, meadowy swales, and marsh edges, sometimes fens, usually on circumneutral or basic substrates
Elevation: 0–300 m

Distribution

V23 371-distribution-map.jpg

Ala., Ark., Fla., Ga., La., Miss., N.C., S.C., Tex., Va., Mexico, West Indies, Central America, South America (French Guiana)

Discussion

Rhynchospora colorata is a slender and clonal version of R. latifolia, with a distinct preference for more basic substrates; involucral bracts are very slender and have a longer portion of green, usually reaching well proximal to midbract.

See also 16. Rhynchospora latifolia.

Selected References

None.

Lower Taxa

None.

"shortened" is not a number.No values specified."wider" is not a number.

... more about "Rhynchospora colorata"
acuminate;blunt;acute;acute;trigonous;tapering +
Robert Kral +
(Linnaeus) H. Pfeiffer +
2-lobed +  and lunate +
broadened +
Schoenus coloratus +  and Scirpus cephalotes +
scabridulous +  and scabrid +
flattened +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
yellow +  and mahogany +
1 cm10 mm <br />0.01 m <br /> (?) +
warty +, papillate +, alveolate +  and pitted +
lenticular +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
13 cm130 mm <br />0.13 m <br /> (?) +
ascending +  and appressed +
tapered +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
parallel +  and divergent +
terete +, rolled +  and plicate +
trigonous +
slender +
Ala. +, Ark. +, Fla. +, Ga. +, La. +, Miss. +, N.C. +, S.C. +, Tex. +, Va. +, Mexico +, West Indies +, Central America +  and South America (French Guiana) +
0–300 m +
distalmost +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
biconvex +  and trigonous +
Sands, peats, and silt of interdunal swales, shores, meadowy swales, and marsh edges, sometimes fens, usually on circumneutral or basic substrates +
racemose +, corymbose +  and paniculate +
3-ranked +  and polystichous +
spreading;erect +
cauline +  and basal +
keeled;terete;keeled;terete +
revolute +  and involute +
decurrent +
plumed +  and barbed +
deciduous +  and persistent +
shorter or longer +
of 2-12(-20) bristles +
Fruiting late spring–summer. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
Repert. Spec. Nov. Regni Veg. +
0 cm0 mm <br />0 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
adventitious +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
basal +  and proximal +
boat-shaped +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
cylindric +
Illustrated +
1 +, 3 +  and 100 +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
2 +  and 3 +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
cleft +, 2-fid +  and undivided +
Dichromena cephalotes +, Dichromena colorata +, Dichromena leucocephala +  and Rhynchospora drummondiana +
Rhynchospora colorata +
Rhynchospora +
species +
tapered +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
sulcate +  and 2-edged +
triangular +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
plant +, solitary +  and cespitose +