Carex arkansana

(L. H. Bailey) L. H. Bailey

Bot. Gaz. 21: 6. 1896.

IllustratedEndemic
Basionym: Carex rosea var. arkansana L. H. Bailey Bot. Gaz. 13: 87. 1888 (as arkansas)
Treatment appears in FNA Volume 23. Mentioned on page 294.

Plants without conspicuous rhizomes. Culms 15–60 cm, 1.4–2 mm wide basally, 0.7–0.9 mm wide distally. Leaves: sheaths tight, green, fronts hyaline; ligules to 1.5 mm, wider than long; widest leaf-blades 1–2.5 mm wide. Inflorescences with 3–6 spikes, 1.5–4 cm × 7–12 mm; proximal internodes 1–1.5 times as long as proximal spikes; proximal bracts 6–25 cm, at least 2 times as long as inflorescences; spikes with 8–20 spreading perigynia. Pistillate scales hyaline with green, 3-veined center, ovate, 2–3.5 × 1.2–2.4 mm, body 2/3 to almost length of perigynium, distinctly narrower, apex acuminate to awned. Anthers 1.3–1.8 mm. Perigynia pale green, veinless or indistinctly veined abaxially, 3.3–4 × 2.3–3 mm, base of body somewhat spongy, thickened, margins serrulate distally; beak 0.8–1.2 mm, apical teeth 0.3–0.7 mm. Achenes suborbiculate, 1.5–2 × 1.5–1.8 mm.


Phenology: Fruiting late spring.
Habitat: Moist prairies, forest openings, roadside ditches
Elevation: 100–500 m

Distribution

V23 507-distribution-map.jpg

Ark., Ill., Kans., Mo., Okla., Tex.

Discussion

Selected References

None.

Lower Taxa

None.

"narrower" is not a number."timesaslongasinflorescences" is not declared as a valid unit of measurement for this property.

... more about "Carex arkansana"
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
suborbiculate +
smaller +
1.5mm;1.8mm +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
Peter W. Ball +
(L. H. Bailey) L. H. Bailey +
shortened +
white-hyaline +, hyaline +  and narrow +
red tinged +  and brown +
rounded +
Carex rosea var. arkansana +
bidentate +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
v--shaped +
0mm;20mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
0.2 cm2 mm <br />0.002 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.24 cm2.4 mm <br />0.0024 m <br />) +
round +  and trigonous +
15 cm150 mm <br />0.15 m <br /> (60 cm600 mm <br />0.6 m <br />) +
0.7mm;0.9mm +
Ark. +, Ill. +, Kans. +, Mo. +, Okla. +  and Tex. +
100–500 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Moist prairies, forest openings, roadside ditches +
, +  and racemose +
sessile +  and pistillate +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
0 cm0 mm <br />0 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
wider than long +
with (1-)3-6(-30) bristles and/or scales +
veined +  and veinless +
0.33 cm3.3 mm <br />0.0033 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.23 cm2.3 mm <br />0.0023 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Fruiting late spring. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
6 cm60 mm <br />0.06 m <br /> (25 cm250 mm <br />0.25 m <br />) +
1-1.5 times as long as proximal spikes +
adventitious +
hyaline with green +
basal +  and proximal +
2-keeled +
cylindric +
Illustrated +  and Endemic +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +
2-3(-4)-fid +
Carex arkansana +
Carex sect. Phaestoglochin +
species +
rhizomatous +  and short-rhizomatous +
0.1 cm1 mm <br />0.001 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +