Carex oronensis

Fernald

Proc. Amer. Acad. Arts 37: 471, plate 1, figs. 15, 16. 1902.

Common names: Orono sedge
IllustratedEndemicConservation concern
Treatment appears in FNA Volume 23. Treatment on page 354. Mentioned on page 334, 362.

Plants loosely cespitose. Culms 30–100 cm. Leaves: sheaths papillose, summits U-shaped; distal ligules 2.1–4.6 mm; blades 3–4 per fertile culm, 18–23 cm × 2–4 mm. Inflorescences stiffly erect, open, coppery brown, 1.5–3.4 cm × 6–15 mm; proximal internode (1–) 3–6 (–9) mm; 2d internode 1–4 mm; proximal bracts usually scalelike, occasionally bristlelike. Spikes (3–) 5–6 (–10), distant, individually distinct, rhomboid-ovoid, 5–10 × 3–7 mm, base and apex tapered. Pistillate scales mid to dark-brown, usually with pale midstripe, glossy, lanceolate, (3–) 3.5–3.7 (–4) mm, subequal to perigynia in length and width, margin white-hyaline, to 0.15 mm wide, apex acute. Perigynia ascending, light green to straw colored, pearlescent, often with adaxial reddish-brown blotch, conspicuously 7–15-veined abaxially, usually inconspicuously or conspicuously (6–) 9–12-veined adaxially, lanceolate, planoconvex, 2.9–4.3 × 0.9–1.4 mm, 0.6 mm thick, margin flat, including wing 0.07–0.4 mm wide, unwinged below median; beak brown, white-hyaline at tip, flat, ciliate-serrulate, abaxial suture conspicuous, often with narrow white-hyaline margin, distance from beak tip to achene 1.5–2.4 mm. Achenes ovate, 1.3–1.6 × 0.7-1.4 mm, 0.3–0.5 mm thick. 2n = 74.


Phenology: Fruiting summer (late Jun–mid Jul).
Habitat: Hay fields, forest edges, open woods
Elevation: 30–400 m

Discussion

Of conservation concern.

Carex oronensis is in the Center for Plant Conservation’s National Collection of Endangered Plants.

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 oronensis"
smaller +
0.3mm +  and 0.5mm +
bidentatate +
papillose +
Joy Mastrogiuseppe +, Paul E. Rothrock +, A. C. Dibble +  and A. A. Reznicek +
Fernald +
shortened +
persistent +
tapered +
not enlarged +
ciliate-serrulate +
18 cm180 mm <br />0.18 m <br /> (23 cm230 mm <br />0.23 m <br />) +
3 (?) +  and 4 (?) +
v--shaped +
2mm;4mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
Orono sedge +
round +  and trigonous +
30 cm300 mm <br />0.3 m <br /> (100 cm1,000 mm <br />1 m <br />) +
0.21 cm2.1 mm <br />0.0021 m <br /> (0.46 cm4.6 mm <br />0.0046 m <br />) +
30–400 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Hay fields, forest edges, open woods +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
not prophyllate +, sessile +  and pistillate +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
white-hyaline +
0.07mm +  and 0.4mm +
with (1-)3-6(-30) bristles and/or scales +
(6-)9-12-veined +  and 7-15-veined +
light green +  and straw colored +
0.6 +  and 2.9-4.3×0.9-1.4 +
Fruiting summer (late Jun–mid Jul). +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Proc. Amer. Acad. Arts +
adventitious +
0.37 cm3.7 mm <br />0.0037 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
lanceolate +
subequal +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.37 cm3.7 mm <br />0.0037 m <br />) +
herbaceous +  and membranous +
not differentiated +
papillose +
cylindric +
Illustrated +, Endemic +  and Conservation concern +
distinct +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
rhomboid-ovoid +
0.3 cm3 mm <br />0.003 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 +
u--shaped +
Carex oronensis +
Carex sect. Ovales +
species +
plant +  and cespitose +