Carex pansa

L. H. Bailey

Bot. Gaz. 13: 82. 1888.

IllustratedEndemic
Synonyms: Carex arenicola subsp. pansa (L. H. Bailey) T. Koyama & Calder
Treatment appears in FNA Volume 23. Mentioned on page 305.

Rhizomes coarse, 1.8–2.6 mm thick, typically with long, unbranched segments from which shoots arise singly every few nodes. Culms sharply trigonous, 8–40 cm, scabrous-angled distally. Leaves: basal sheaths dark-brown; sheaths with hyaline inner band, apex not prolonged, glabrous; ligules 0–1.2 mm; blades 1.7–3.8 mm wide. Inflorescences 1.2–2.5 cm; spikes 3–12, usually unisexual; staminate spikes lanceoloid; pistillate spikes compact, ovoid. Pistillate scales dark reddish-brown to nearly purple-black, with broad hyaline margins, ovate, apex acute to acuminate-awned, shiny. Anthers 1.7–3.1 mm, apiculus bristly hairy (30X). Perigynia dark-brown to nearly black at maturity, essentially veinless adaxially, usually ± stipitate, ovate, planoconvex, 3.1–4.2 × 1.3–1.8 mm, dull; beak 0.7–1.5 mm, apex ± hyaline, obscurely bidentate.


Phenology: Fruiting May–Jul.
Habitat: Dunes and sandy, open habitats
Elevation: 0–30 m

Distribution

V23 531-distribution-map.jpg

B.C., Calif., Oreg., Wash.

Discussion

Carex pansa is striking not only for its sand-dune habitat, but its very dark scales, basal sheaths, and rhizomes scales.

Although C. pansa is sometimes united with the east Asian C. arenicola as subsp. pansa, the North American species seems clearly closer to C. praegracilis. Carex arenicola, though occupying a similar habitat, differs in its usually more elongate, ellipsoid inflorescences, mostly bisexual spikes, pale and dull brown pistillate scales with an inconspicuous hyaline margins, usually larger perigynia (ca. 3.7–5.2 mm) that somewhat exceed the scales, anthers with very short apiculus (<0.1 mm), and paler brown, bladeless basal sheaths and rhizomes scales.

Selected References

None.

Lower Taxa

None.

"not prolonged" is not a number.

... more about "Carex pansa"
biconvex +
smaller +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.31 cm3.1 mm <br />0.0031 m <br />) +
hairy +  and bristly +
A. A. Reznicek +  and Paul M. Catling +
L. H. Bailey +
shortened +
not +  and fibrous +
rounded +
1/4 length of body +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
v--shaped +
1.7mm;3.8mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
not wide +
scabrous-angled +  and trigonous +
8 cm80 mm <br />0.08 m <br /> (40 cm400 mm <br />0.4 m <br />) +
B.C. +, Calif. +, Oreg. +  and Wash. +
0–30 m +
stipitate +, veinless +  and veined +
ovate;narrowly ovate planoconvex or biconvex +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Dunes and sandy, open habitats +
ovoid +  and cylindric +
1.2 cm12 mm <br />0.012 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
0 cm0 mm <br />0 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
with (1-)3-6(-30) bristles and/or scales +
stipitate +  and veinless +
dark-brown +  and nearly black +
0.31 cm3.1 mm <br />0.0031 m <br /> (0.42 cm4.2 mm <br />0.0042 m <br />) +
ascending +  and erect +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
Fruiting May–Jul. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
cuspidate;scale-like +
short-awned +  and cuspidate +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.26 cm2.6 mm <br />0.0026 m <br />) +
adventitious +
dark reddish-brown +  and nearly purple-black +
basal +  and proximal +
cylindric +
Illustrated +  and Endemic +
pistillate +  and staminate +
ovoid;lanceoloid +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +
2-3(-4)-fid +
Carex arenicola subsp. pansa +
Carex pansa +
Carex sect. Divisae +
species +
plant +, colonial +  and not cespitose +