Carex floridana

Schweinitz

Ann. Lyceum Nat. Hist. New York 1: 66. 1824.

IllustratedEndemic
Synonyms: Carex nigromarginata var. floridana (Schweinitz) Kükenthal
Treatment appears in FNA Volume 23. Mentioned on page 542.

Plants densely cespitose; rhizomes horizontally spreading to ascending, reddish-brown, 17–75 mm, stout. Culms 5–17 cm, scabrous distally; bases (remnants of old leaves) weakly fibrous. Leaf-blades green, occasionally glaucous, exceeding culms, 1.7–3 mm wide, herbaceous, papillose to scabrous abaxially, papillose to scabrous adaxially. Inflorescences with both staminate and pistillate spikes; peduncles of staminate spikes 0.3–1.2 mm; proximal cauline bracts leakflike, shorter than inflorescences. Spikes: proximal pistillate spikes 2–3 (basal spikes 0); cauline spikes overlapping, proximal 2 separated by less than 7 mm, with 4–8 perigynia; staminate spikes (3–) 6.1–9.3 × 1.1–1.7 mm. Scales: pistillate scales pale to dark reddish-brown, with narrow white margins, ovate to lanceolate, 2.7–4.2 × 1.2–2 mm, shorter than to equaling perigynia, apex acute to acuminate or short-aristate; staminate scales lanceolate, 2.8–4 × 1.2–1.8 mm, apex obtuse or acute to acuminate. Anthers 1.8–2 mm. Perigynia pale green, veinless, ellipsoid, 3–4.1 × 0.9–1.4 mm; beak straight, pale green, 0.6–0.9 mm, weakly ciliate-serrulate, apical teeth 0.1–0.3 mm. Stigmas 2 (–3). Achenes brown, ellipsoid, biconvex, flattened-trigonous, or evenly trigonous with convex sides (all three types may occur on the same plant), 1.5–2 × 0.9–1.3 mm.


Phenology: Fruiting early Feb–late Apr.
Habitat: Dry, sandy loam or sand, in partial shade of mixed pine-hardwood forests or full sun along open roads and forest edges
Elevation: 0–200 m

Distribution

V23 1024-distribution-map.jpg

Ala., Fla., Ga., La., Miss., N.C., S.C., Tex.

Discussion

Carex floridana usually has been recognized as a distinct species in recent years; the distinctions from C. nigromarginata are subtle. To further complicate matters, some specimens are incomplete, lacking either complete bases or mature perigynia, rendering them unidentifiable. We have retained the two taxa at specific rank; further examination of their morphology, cytology, and ecology is warranted.

Selected References

None.

Lower Taxa

None.
... more about "Carex floridana"
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
trigonous;flattened-trigonous;trigonous;flattened-trigonous;biconvex;ellipsoid +
0.9mm;1.3mm +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
beaked +, awned +  and cuspidate +
glabrous +  and pubescent +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
William J. Crins +  and Jeff H. Rettig +
Schweinitz +
shortened +
rounded +  and tapering +
ciliate-serrulate +
straight +
bidentate +  and bent +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
v--shaped +
2mm;4.5mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
brown +  and red +
round +  and trigonous +
5 cm50 mm <br />0.05 m <br /> (17 cm170 mm <br />0.17 m <br />) +
Ala. +, Fla. +, Ga. +, La. +, Miss. +, N.C. +, S.C. +  and Tex. +
0–200 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Dry, sandy loam or sand, in partial shade of mixed pine-hardwood forests or full sun along open roads and forest edges +
prophyllate +, pedunculate +, staminate +, , +  and pistillate +
papillose;scabrous abaxially +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
with (1-)3-6(-30) bristles and/or scales +
0.3 cm3 mm <br />0.003 m <br /> (0.41 cm4.1 mm <br />0.0041 m <br />) +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
Fruiting early Feb–late Apr. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
scale-like +  and filiform +
Ann. Lyceum Nat. Hist. New York +
reddish-brown +
horizontally spreading +  and ascending +
1.7 cm17 mm <br />0.017 m <br /> (7.5 cm75 mm <br />0.075 m <br />) +
adventitious +
staminate +  and pistillate +
pale +  and dark reddish-brown +
0.28 cm2.8 mm <br />0.0028 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
basal +  and proximal +
lanceolate;ovate;lanceolate +
1.2mm;1.8mm +
cylindric +
Illustrated +  and Endemic +
staminate +  and pistillate +
0.3 cm3 mm <br />0.003 m <br /> (0.61 cm6.1 mm <br />0.0061 m <br />) +
0.61 cm6.1 mm <br />0.0061 m <br /> (0.93 cm9.3 mm <br />0.0093 m <br />) +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +
2-3(-4)-fid +
Carex nigromarginata var. floridana +
Carex floridana +
Carex sect. Acrocystis +
species +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
stoloniferous +  and rhizomatous +
plant +  and cespitose +