Carex diandra

Schrank

Cent. Bot. Anmerk., 57 [49]. 1781.

Common names: Carex diandre
Illustrated
Treatment appears in FNA Volume 23. Treatment on page 281. Mentioned on page 279, 280.

Culms (1–) 2–90 cm. Leaves: sheaths adaxially whitish, conspicuously red dotted, truncate or convex at mouth, prolonged 0.4–4 (–6) mm beyond base of blade; ligules 8–57 mm; foliage leaf-blades 14–30 (–47) cm × 1–2.5 mm. Inflorescences bisexual, straight, little interrupted, ± compound (short branch at least on most proximal node or, occasionally, unbranched), 2–5 (–6) × 0.6–1.4 (–1.7) cm, proximal 0–3 branches slightly overlapping 1 above; basal branch (when present) with 2–12 spikes; proximal internode 3–7 (–10) mm. Pistillate scales straw colored or brownish, 1.5–2.7 × 0.9–1.6 mm, as wide as perigynia at base, narrower distally. Perigynia ± spreading, olive to dark chestnut-brown, stongly 4–6-veined and finely 2–4-veined abaxially, with narrow median strip extending full length (grooved aspect emphasized by pair of bordering veins), often membranous flap toward apex, narrowly deltoid-ovoid, unequally biconvex, (2–) 2.3–2.5 (–2.9) × 1–1.4 mm, shiny; beak 0.9–1.1 mm. Achenes broadly compressed-ovoid, 1.4–1.7 × 0.7–1 mm. 2n = 48, 50, 54, 60.


Phenology: Fruiting late May–mid Aug (Sep in Calif).
Habitat: Swampy, marshy, or boggy areas, especially wet meadows, fens, muskegs, floating mats, and peaty or marly shores of lakes and ponds (often in shallow, sometimes brackish water), less often swales, springy thickets, ditches, and wet sandy beaches of nonalkaline lakes
Elevation: 0–2800 m

Distribution

V23 475-distribution-map.jpg

St. Pierre and Miquelon, Alta., B.C., Man., N.B., Nfld. and Labr., N.W.T., N.S., Nunavut, Ont., P.E.I., Que., Sask., Yukon, Alaska, Calif., Colo., Conn., Ill., Ind., Iowa, Maine, Md., Mass., Mich., Minn., Mont., Nebr., N.H., N.J., N.Y., N.Dak., Ohio, Oreg., Pa., R.I., Utah, Vt., Wash., Wis., Wyo., Eurasia (including Iceland), Atlantic Islands (Canary Islands), Pacific Islands (New Zealand)

Discussion

Although common northward (but not at the highest latitudes except in District of Mackenzie and Yukon), this circumboreal sedge is occasional to rare throughout much of its United States range. Carex diandra was reported from Tennessee by J. K. Underwood (1945) and in lists of Tennessee plants on the basis of an old specimen that has been destroyed. H. A. Gleason and A. Cronquist’s (1963, 1991) report for Missouri, quoted in later floras and catalogues, is believed to be erroneous. See comments under C. prairea.

Selected References

None.

Lower Taxa

None.

"shortened" is not a number.

... more about "Carex diandra"
60 +, 54 +, 50 +  and 48 +
0.14 cm1.4 mm <br />0.0014 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
compressed-ovoid +
smaller +
0.7mm;1mm +
acute;cuspidate +
Theodore S. Cochrane +
Schrank +
tapered +  and rounded +
narrower +
bidentate +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
v--shaped +
0 cm0 mm <br />0 m <br /> (2 cm20 mm <br />0.02 m <br />) +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
Carex diandre +
brown +  and dark-brown +
round +  and trigonous +
2 cm20 mm <br />0.02 m <br /> (90 cm900 mm <br />0.9 m <br />) +
St. Pierre and Miquelon +, Alta. +, B.C. +, Man. +, N.B. +, Nfld. and Labr. +, N.W.T. +, N.S. +, Nunavut +, Ont. +, P.E.I. +, Que. +, Sask. +, Yukon +, Alaska +, Calif. +, Colo. +, Conn. +, Ill. +, Ind. +, Iowa +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Mont. +, Nebr. +, N.H. +, N.J. +, N.Y. +, N.Dak. +, Ohio +, Oreg. +, Pa. +, R.I. +, Utah +, Vt. +, Wash. +, Wis. +, Wyo. +, Eurasia (including Iceland) +, Atlantic Islands (Canary Islands) +  and Pacific Islands (New Zealand) +
0–2800 m +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.29 cm2.9 mm <br />0.0029 m <br />) +
0.23 cm2.3 mm <br />0.0023 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
biconvex +  and deltoid-ovoid +
membranous +
1mm;1.4mm +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
30 cm300 mm <br />0.3 m <br /> (47 cm470 mm <br />0.47 m <br />) +
14 cm140 mm <br />0.14 m <br /> (30 cm300 mm <br />0.3 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
biconvex +  and trigonous +
Swampy, marshy, or boggy areas, especiallySwampy, marshy, or boggy areas, especially wet meadows, fens, muskegs, floating mats, and peaty or marly shores of lakes and ponds (often in shallow, sometimes brackish water), less often swales, springy thickets, ditches, and wet sandy beaches of nonalkaline lakesand wet sandy beaches of nonalkaline lakes +
compound +  and interrupted +
5 cm50 mm <br />0.05 m <br /> (6 cm60 mm <br />0.06 m <br />) +
1.4 cm14 mm <br />0.014 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
sessile +  and pistillate +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
0.8 cm8 mm <br />0.008 m <br /> (5.7 cm57 mm <br />0.057 m <br />) +
scale-like +
with (1-)3-6(-30) bristles and/or scales +
2-4-veined +  and 4-6-veined +
olive +  and dark chestnut-brown +
Fruiting late May–mid Aug (Sep in Calif). +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Cent. Bot. Anmerk., +
adventitious +
brownish +  and straw colored +
basal +  and proximal +
2-keeled +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
prolonged +
convex +  and truncate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Illustrated +
1 +  and 3 +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +
2-3(-4)-fid +
Carex sect. Paniculatae +
Carex diandra +
Carex sect. Heleoglochin +
species +
plant +  and cespitose +