Carex chihuahuensis

Mackenzie

Bull. Torrrey Bot. Club 35: 265. 1908.

Illustrated
Treatment appears in FNA Volume 23. Treatment on page 282. Mentioned on page 280.

Culms to 400 cm × 4 mm, scabrous. Leaves: sheath fronts spotted redbrown, plane, apex truncate or concave; ligule rounded, to 1 mm, free limb to 0.2 mm; blades 15 cm × 5 mm, shorter than flowering-stem. Inflorescences loosely paniculate, 4–10 cm × 7–15 mm, the proximal branches distinctly separate; bracts scalelike, dilated with wide hyaline edges and prominent midvein; the proximal bracts setaceous, prolonged to 10–15 mm. Scales hyaline, pale-brown with prominent white-hyaline margins, apex acute or obtuse. Perigynia yellowbrown to dark-brown, 5–11-veined abaxially, occasionally 3–5-veined adaxially, body ovate, 3–3.6 × 1.2–1.6 mm, base rounded or cordate, conspicuous corky tissue distending the perigynium; beak chestnut-brown, 0.6–1.5 mm, apex white-hyaline, deeply bidentate. Achenes brown, ovate, 1.5 × 1 mm.


Phenology: Fruiting Jun–Jul.
Habitat: Stream banks, springs, seeps
Elevation: 1000–3000 m

Discussion

Carex chihuahuensis is distinguished from the similar C. alma by the pale brown perigynia and the short-prolonged bracts; there is overlap in some character states. The relationship between these species merits further study, as does their placement in sect. Multiflorae because their achene and perigynium characteristics approach those of sect. Vulpinae.

Selected References

None.

Lower Taxa

None.

"wide" is not a number."prolonged" is not a number.

... more about "Carex chihuahuensis"
1.5 cm15 mm <br />0.015 m <br /> (?) +
smaller +
white-hyaline +
Lisa A. Standley +
Mackenzie +
shortened +
cordate +  and rounded +
Carex subsect. Multiflorae +
bidentate +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
15 cm150 mm <br />0.15 m <br /> (?) +
v--shaped +
0.3 cm3 mm <br />0.003 m <br /> (0.36 cm3.6 mm <br />0.0036 m <br />) +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
dilated +  and scale-like +
parallel +  and divergent +
terete +, rolled +  and plicate +
0 cm0 mm <br />0 m <br /> (400 cm4,000 mm <br />4 m <br />) +
round +  and trigonous +
Ariz. +  and Mexico (Chihuhua) +
1000–3000 m +
hypogynous +  and subtending +
biconvex +  and trigonous +
Stream banks, springs, seeps +
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 />) +
white-hyaline +
with (1-)3-6(-30) bristles and/or scales +
3-5-veined +  and 5-11-veined +
yellowbrown +  and dark-brown +
spreading +  and ascending +
Fruiting Jun–Jul. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Bull. Torrrey Bot. Club +
adventitious +
pale-brown +  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 chihuahuensis +
Carex sect. Multiflorae +
species +
conspicuous +
plant +  and cespitose +