Carex petricosa

Dewey

Amer. J. Sci. Arts 29: 246, plate W, fig. 70. 1836.

Illustrated
Treatment appears in FNA Volume 23. Treatment on page 478. Mentioned on page 477, 479.

Plants loosely cespitose; rhizomes slender, long. Culms 10–90 cm. Leaves: blades 1–3.5 mm wide. Inflorescences 3–12 (–22) cm; proximal internodes 10–60 (–100) mm; peduncles of proximal spikes to 8 cm; proximal bracts with blades 5–140 mm, sheaths cylindric, 5–25 (–35) mm, mouth 0.9–1.5 mm wide. Spikes 3–8; lateral spikes androgynous or pistillate, rarely some entirely staminate, the proximal inclined or pendent, 5–30 × 3–7 mm; terminal spike staminate or androgynous, 10–28 × 1.8–4 mm. Pistillate scales brown to black, oblong-obovate, 3–5.8 × 1.1–2 mm, apex obtuse to acute, sometimes shortly awned. Staminate scales brown or black with hyaline margins, oblongovate, 3.1–6.2 × 1–3 mm. Anthers 1.5–3 mm. Perigynia ascending, pale-yellow proximally, brown or black distally, 3–9-veined, lanceolate, 3.5–5.5 × 1.1–2.4 mm, margins ciliate-serrulate distally, apex tapered, shortly setose, sometimes setae confined to veins, or subglabrous; beak indistinct, to 0.5 (–1) mm. Achenes obovoid, 1.7–2.2 × 1–1.3 mm.

Distribution

V23 876-distribution-map.jpg

Alta., B.C., N.W.T., Que., Yukon, Alaska, Mont., e temperate Asia

Discussion

Varieties 2 (2 in the flora).

Carex petricosa shows considerable variation, even within one clone, in the distribution of staminate and pistillate flowers in the inflorescence. The two taxa recognized can usually be distinguished by stigma number. A small number of individuals are to determine on purely morphologic grounds.

Selected References

None.

Key

1 Stigmas 3; achenes trigonous in at least 1/2 of pistillate flowers and fruits. Carex petricosa var. petricosa
1 Stigmas 2; achenes biconvex in at least 1/2 of pistillate flowers and fruits. Carex petricosa var. misandroides
... more about "Carex petricosa"
0.17 cm1.7 mm <br />0.0017 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
smaller +
1mm;1.3mm +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Peter W. Ball +  and Joy Mastrogiuseppe +
shortened +
tapered +  and rounded +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
straight +
indistinct +
bidentate +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
v--shaped +
0.5 cm5 mm <br />0.005 m <br /> (?) +  and 14 cm140 mm <br />0.14 m <br /> (?) +
1mm;3.5mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
round +  and trigonous +
10 cm100 mm <br />0.1 m <br /> (90 cm900 mm <br />0.9 m <br />) +
2 cm20 mm <br />0.02 m <br /> (?) +
Alta. +, B.C. +, N.W.T. +, Que. +, Yukon +, Alaska +, Mont. +  and e temperate Asia +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
12 cm120 mm <br />0.12 m <br /> (22 cm220 mm <br />0.22 m <br />) +
3 cm30 mm <br />0.03 m <br /> (12 cm120 mm <br />0.12 m <br />) +
staminate +  and pistillate +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
with (1-)3-6(-30) bristles and/or scales +
black +, brown +  and pale-yellow +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.24 cm2.4 mm <br />0.0024 m <br />) +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
1 cm10 mm <br />0.01 m <br /> (6 cm60 mm <br />0.06 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (3 cm30 mm <br />0.03 m <br />) +
pendent +  and inclined +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
scale-like +  and filiform +
Amer. J. Sci. Arts +
adventitious +
staminate +  and pistillate +
black +  and brown +
0.31 cm3.1 mm <br />0.0031 m <br /> (0.62 cm6.2 mm <br />0.0062 m <br />) +
basal +  and proximal +
oblong-obovate +
1mm;3mm +
subglabrous +
2.5 cm25 mm <br />0.025 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
cylindric +
0.5 cm5 mm <br />0.005 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
Illustrated +
0 cm0 mm <br />0 m <br /> (8 cm80 mm <br />0.08 m <br />) +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +
2-3(-4)-fid +
Carex sect. Ferrugineae +
Carex petricosa +
Carex sect. Aulocystis +
species +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
stoloniferous +  and rhizomatous +
plant +  and cespitose +