Carex interrupta

Boeckeler

Linnaea 40: 432. 1876.

IllustratedEndemic
Synonyms: Carex interrupta var. distenta Kükenthal
Treatment appears in FNA Volume 23. Treatment on page 396. Mentioned on page 381, 393.

Plants not cespitose. Culms obtusely angled, 20–75 cm, glabrous. Leaves: basal sheaths redbrown; sheaths of proximal leaves glabrous, fronts lacking spots and veins, entire, apex U-shaped; blades 3–5 mm wide. Proximal bract subequal to inflorescence, 2–3 mm wide. Spikes erect; proximal 4–7 spikes pistillate, 4–9 cm × 3–4 mm, base attenuate; terminal 1 (–2) spikes staminate. Pistillate scales redbrown or black, shorter than or equaling perigynia, apex acute, awnless. Perigynia ascending, olive-green, veinless, distended by and tightly enclosing achenes, ellipsoid or obovoid, 1.5–2.1 × 0.9–1.4 mm, dull, apex rounded, glabrous; beak green, 0.1–0.3 mm, orifice oblique. Achenes not constricted, dull. 2n = 68.


Phenology: Fruiting Jul–Aug.
Habitat: Sandy soils along rivers, occasionally wet meadows
Elevation: 0–600 m

Discussion

Carex interrupta, an uncommon species, is distinguished by the very small, green, glabrous perigynia distended and often split by the developing achenes. Relationships of the species with other members of the section are not clear; it shares distinctive characteristics with C. torta and C. endlichii, the next two species.

Selected References

None.

Lower Taxa

None.
... more about "Carex interrupta"
biconvex +
not constricted +
, +  and papillose +
Lisa A. Standley +, Jacques Cayouette +  and Leo Bruederle +
Boeckeler +
shortened +
not +  and fibrous +
attenuate +
bidentate +  and emarginate +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
m--shaped +  and v--shaped +
3mm;5mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
redbrown +  and brown +
20 cm200 mm <br />0.2 m <br /> (75 cm750 mm <br />0.75 m <br />) +
prophyllate +, subsessile +, pedunculate +  and staminate +
B.C. +, Oreg. +  and Wash. +
0–600 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Sandy soils along rivers, occasionally wet meadows +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
with (1-)3-6(-30) bristles and/or scales +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.21 cm2.1 mm <br />0.0021 m <br />) +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
Fruiting Jul–Aug. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
short-sheathing +, sheathless +  and leaflike +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
adventitious +
black +  and redbrown +
basal +  and proximal +
2-keeled +
ladder-fibrillose +  and veined +
cylindric +
Illustrated +  and Endemic +
staminate +  and pistillate +
4 cm40 mm <br />0.04 m <br /> (9 cm90 mm <br />0.09 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +
2-3(-4)-fid +
Carex interrupta var. distenta +
Carex interrupta +
Carex sect. Phacocystis +
species +
, +  and staminate +
plant +  and not cespitose +