Carex aquatilis var. dives

(Holm) Kükenthal in H. G. A. Engler

in H. G. A. Engler, Pflanzenr. 28[IV,20]: 311. 1909.

Basionym: Carex dives T. Holm
Synonyms: Carex howellii L. H. BaileyCarex panda C. B. ClarkeCarex sitchensis Prescott ex Bongard
Treatment appears in FNA Volume 23. Treatment on page 398. Mentioned on page 397.
Revision as of 01:52, 27 July 2019 by FNA>Volume Importer
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

Culms 35–150 cm, angles scabrous. Leaves: basal sheaths leafless, usually red-brown; blades epistomic, 5–18 mm wide, adaxially papillose. Inflorescences: peduncle of proximal spike to 11 cm; proximal bract longer than inflorescence, 3–10 mm wide. Spikes pendent or the terminal usually erect; proximal 3–6 spikes pistillate, 4.5–11.5 cm × 4–7 mm, base attenuate; terminal 2–4 spikes staminate. Pistillate scales red-brown or purple-brown. Perigynia pale brown, ellipsoid, 1.9–3.5 × 1–1.2 mm, apex acute or obtuse; beak purple-brown, 0.3–0.4 mm, papery. 2n = 72, 74, 78, 80.


Phenology: Fruiting Jul–Aug.
Habitat: Marshes, shallow water along shores
Elevation: 0–900 m

Distribution

V23 711-distribution-map.jpg

B.C., Alaska, Calif., Mont., Oreg., Wash.

Discussion

Carex aquatilis var. dives is the most robust variety of C. aquatilis and the only member to have pendent spikes, ellipsoid perigynia, and epistomic leaves. Carex aquatilis var. dives intergrades with var. aquatilis and does not appear to be distinct at the specific level. It may hybridize with C. lyngbyei.

Selected References

None.

Lower Taxa

None.
Lisa A. Standley +, Jacques Cayouette +  and Leo Bruederle +
(Holm) Kükenthal in H. G. A. Engler +
Carex dives +
B.C. +, Alaska +, Calif. +, Mont. +, Oreg. +  and Wash. +
0–900 m +
Marshes, shallow water along shores +
Fruiting Jul–Aug. +
in H. G. A. Engler, Pflanzenr. +
W2 +, W1 +  and Illustrated +
Carex howellii +, Carex panda +  and Carex sitchensis +
Carex aquatilis var. dives +
Carex aquatilis +
variety +