Carex alma

L. H. Bailey

Mem. Torrey Bot. Club 1: 50. 1889.

Illustrated
Synonyms: Carex agrostoides Mackenzie Carex vitrea T. Holm
Treatment appears in FNA Volume 23. Treatment on page 283. Mentioned on page 280, 282.

Culms to 90 cm × 2 mm, scabrous. Leaves: sheath fronts spotted redbrown, veinless, plane, apex truncate to convex, membranous; ligule rounded, to 1 mm, free limb to 0.2 mm; blades to 75 cm × 6 mm, shorter than flowering-stem. Inflorescences loosely paniculate, 4–12 cm × 15–20 mm, with 10–20 branches proximal branches distinct; the proximal internode to 25 mm; bracts scalelike, not conspicuous, the awn, when present, 15–50 mm. Scales hyaline, redbrown or pale-brown, margins colorless, broad, shining, apex acute or mucronate. Anthers with prominent apiculus to 0.5 mm. Perigynia dark brown-black, 3–5-veined abaxially, 0–3-veined adaxially, body ovate to lanceolate, 3–4.5 × 1.5–2 mm, base rounded to cordate, conspicuous basal spongy tissue somewhat distending perigynium; beak 1–1.5 mm. Achenes redbrown, ovate, 1.2–1.5 × 1–1.2 mm, glossy; style base cylindric.


Phenology: Fruiting Jul–Aug.
Habitat: Stream banks, springs, seeps in desert regions
Elevation: 600–2700 m

Distribution

V23 478-distribution-map.jpg

Ariz., Calif., Nev., N.Mex., Tex., Mexico (Baja California), Mexico (Sonora)

Discussion

Carex alma has an unusual combination of characteristics for the section. The conspicuous basal sheaths, the basally spongy perigynia tapering to beak, the hyaline acute scales, and the cylindricly enlarged style bases place the species closer to sect. Vulpinae than to other taxa of sect. Multiflorae. Carex agrostoides, here placed in synonymy with C. alma, has previously been distinguished by the green perigynia and absence of basal spongy tissue. All such specimens, including the type, appear to be immature specimens of C. alma in which spongy tissue and mature perigynium coloration have not developed.

Selected References

None.

Lower Taxa

None.
... more about "Carex alma"
0.12 cm1.2 mm <br />0.0012 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
smaller +
1mm;1.2mm +
membranous +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
Lisa A. Standley +
L. H. Bailey +
1.5 cm15 mm <br />0.015 m <br /> (5 cm50 mm <br />0.05 m <br />) +
shortened +
rounded +  and cordate +
Carex subsect. Multiflorae +
bidentate +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
0 cm0 mm <br />0 m <br /> (75 cm750 mm <br />0.75 m <br />) +
v--shaped +
0.3 cm3 mm <br />0.003 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
ovate +  and lanceolate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
not conspicuous +
scale-like +
parallel +  and divergent +
terete +, rolled +  and plicate +
0 cm0 mm <br />0 m <br /> (90 cm900 mm <br />0.9 m <br />) +
round +  and trigonous +
Ariz. +, Calif. +, Nev. +, N.Mex. +, Tex. +, Mexico (Baja California) +  and Mexico (Sonora) +
600–2700 m +
hypogynous +  and subtending +
biconvex +  and trigonous +
Stream banks, springs, seeps in desert regions +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
with (1-)3-6(-30) bristles and/or scales +
0-3-veined +  and 3-5-veined +
dark brown-black +
spreading +  and ascending +
Fruiting Jul–Aug. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
0 cm0 mm <br />0 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
Mem. Torrey Bot. Club +
adventitious +
pale-brown +, redbrown +  and hyaline +
basal +  and proximal +
2-keeled +
cylindric +
Illustrated +
sessile +  and pistillate +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +
2-3(-4)-fid +
Carex agrostoides +  and Carex vitrea +
Carex alma +
Carex sect. Multiflorae +
species +
plant +  and cespitose +