Carex fracta

Mackenzie

Erythea 8: 38. 1922.

IllustratedEndemic
Treatment appears in FNA Volume 23. Treatment on page 361. Mentioned on page 360.

Plants densely cespitose. Culms 60–115 cm. Leaves: sheaths adaxially green-veined at least in proximal 1/2, Y-shaped white-hyaline band extending at least 10 mm proximal to collar, firm, summits rounded, usually prolonged to 3–9 mm beyond collar; distal ligules (1.5–) 3–13 mm; blades 4–5 (–6) per fertile culm, 20–45 cm × 4–7 mm. Inflorescences proximal branches often bearing more than 1 spike, open or dense, green to pale gold, 3.5–8 cm × 10–16 mm; proximal internode 3–18 mm; 2d internode 3–9 mm; proximal bracts bristlelike, shorter than inflorescences or occasionally leaflike. Spikes 11–35, distant or aggregated, individually distinct or indistinct, lanceoloid to broadly ovoid, 10–18 × 5–7 mm, base acute to attenuate, apex rounded to tapered. Pistillate scales white-hyaline or gold, occasionally tinged brownish or green, with green to gold midstripe, lanceolate or ovate, (2.8–) 3.6–4.5 mm, shorter or longer and narrower than perigynia, apex long-acuminate to awned. Perigynia ascending to spreading, green to gold, conspicuously 8–11-veined abaxially, conspicuously 5–8-veined adaxially, ovate, planoconvex, 2.9–4 (–4.8) × 1–1.7 mm, 0.5 mm thick, margin flat, including wing 0.1–0.2 (–0.3) mm wide, ciliate-serrulate at least distally; beak gold or white at tip, usually cylindric, sometimes falcate, unwinged, ± entire for 0.1–0.5 mm, abaxial suture usually inconspicuous, distance from beak tip to achene 1.3–2 (–2.8) mm. Achenes ovate to elliptic, 1.3–1.6 × 0.8–1.2 mm, (0.3–) 0.4–0.5 mm thick.


Phenology: Fruiting late spring–summer.
Habitat: Montane meadows, open forests, usually moist to dry soils
Elevation: 800–3300 m

Discussion

A form of Carex fracta has larger perigynia (to 5.2 mm) that are distinctly flattened around the achene. The most extreme examples of the form occur in the San Bernardino Mountains of southern California.

Selected References

None.

Lower Taxa

None.

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

... more about "Carex fracta"
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
ovate;elliptic +
smaller +
0.4mm +  and 0.5mm +
bidentatate +
papillose +
Joy Mastrogiuseppe +, Paul E. Rothrock +, A. C. Dibble +  and A. A. Reznicek +
Mackenzie +
shortened +
white-hyaline +
y--shaped +
persistent +
acute +  and attenuate +
not enlarged +
White (?) +  and Gold (?) +
falcate +  and cylindric +
20 cm200 mm <br />0.2 m <br /> (45 cm450 mm <br />0.45 m <br />) +
4 (?) +  and 5 (?) +
v--shaped +
4mm;7mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
10 cm100 mm <br />0.1 m <br /> (?) +
round +  and trigonous +
60 cm600 mm <br />0.6 m <br /> (115 cm1,150 mm <br />1.15 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
Calif. +, Oreg. +  and Wash. +
800–3300 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Montane meadows, open forests, usually moist to dry soils +
0.3 cm3 mm <br />0.003 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
not prophyllate +, sessile +  and pistillate +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
0.1mm +  and 0.2mm +
green +  and gold +
with (1-)3-6(-30) bristles and/or scales +
5-8-veined +  and 8-11-veined +
green +  and gold +
ascending +  and spreading +
0.5 +, 2.9-4 +, 2.9-4mm +  and 4.8mm +
Fruiting late spring–summer. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
1 cm10 mm <br />0.01 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
adventitious +
0.28 cm2.8 mm <br />0.0028 m <br /> (0.36 cm3.6 mm <br />0.0036 m <br />) +
green +, tinged brownish +, gold +  and white-hyaline +
basal +  and proximal +
ovate;lanceolate +
0.36 cm3.6 mm <br />0.0036 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
shorter or longer and narrower +
herbaceous +  and membranous +
not differentiated +
cylindric +
Illustrated +  and Endemic +
aggregated +  and distant +
distinct +
1 cm10 mm <br />0.01 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
lanceoloid;broadly ovoid +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +  and persistent +
2-3(-4)-fid +
prolonged +
0.3 cm3 mm <br />0.003 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
Carex fracta +
Carex sect. Ovales +
species +
plant +  and cespitose +