Carex davisii

Schweinitz & Torrey

Ann. Lyceum Nat. Hist. New York 1: 326. 1825

Common names: Davis’ sedge
Treatment appears in FNA Volume 23. Treatment on page 464. Mentioned on page 463, 465, 542.
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Plants densely cespitose. Culms dark maroon at base; flowering stems 30–100 cm, as long as leaves at maturity or a little shorter, 1.5–3 mm thick, glabrous or pubescent on angles. Leaves: basal sheaths maroon, bladeless, sheaths pubescent or rarely glabrous; others grading from maroon to green on back, light brown-hyaline on front, red dotted and usually pubescent distally, prolonged at apex; blades flat, 3–8 mm wide, usually pubescent on abaxial surface at least near sheath, minutely scabrous on margins. Inflorescences: peduncles of proximal spikes slender, 10–25 mm, pubescent; peduncle of terminal spike 10–30 mm, pubescent; proximal bracts equaling or often exceeding inflorescences; sheaths 15–45 mm; blades 2–6 mm wide. Lateral spikes 2–4, 1 per node, well separated or distal 2 usually overlapping terminal spike, mostly erect when young but at least proximal spikes nodding at maturity, pistillate with 10–40 perigynia attached 1 mm apart distally and to 4 mm apart proximally, cylindric, 10–50 × 3.5–6 mm. Terminal spike gynecandrous, sessile or pedunculate, 15–35 × 2–6 mm. Pistillate scales pale hyaline with broad green midrib, elliptic or ovate-lanceolate, body shorter than mature perigynia but extending into pubescent green awn 2.5–3 mm, often short-ciliate near apex. Perigynia green to olive-green, often red dotted, 2-ribbed with 9–12 almost equally prominent, evenly spaced veins extending from base to apex, slightly inflated around achene, ellipsoid-ovoid, 4.5–6 × 2–2.5 mm, membranous, base rounded, apex narrowing abruptly to minute beak, glabrous; beak bidentate, less than 0.5 mm. Achenes distinctly stipitate, 2.2–2.7 × 1–1.2 mm, stipe 1 mm.

Phenology: Fruiting late spring–mid summer.
Habitat: Floodplain forests, rich deciduous forests and forest margins, usually along streams or in ditches, wooded ravine slopes, meadows, fields and thickets, often associated with calcareous soils

Distribution

V23 850-distribution-map.jpg

Ont., Ark., Conn., Del., Ill., Ind., Iowa, Kans., Ky., Md., Mass., Mich., Minn., Mo., Nebr., N.J., N.Y., Ohio, Okla., Pa., Tenn., Tex., Vt., W.Va., Wis.

Discussion

Glabrous forms are sporadic in the western part of the range and were recognized as Carex davisii forma glabrescens by G. Kükenthal (1909) but do not warrant taxonomic recognition. A single collection of a putative sterile hybrid between C. davisii and C. hirsutella has been reported from Missouri (G. Yatskievych 1999+) but needs further study to confirm the parentage.

References

None.

Lower Taxa

No lower taxa listed.

Facts about "Carex davisii"
AuthorMarcia J. Waterway +
AuthoritySchweinitz & Torrey +
BasionymsHymenochlaenae +
Common nameDavis’ sedge +
DistributionOnt. +, Ark. +, Conn. +, Del. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, Md. +, Mass. +, Mich. +, Minn. +, Mo. +, Nebr. +, N.J. +, N.Y. +, Ohio +, Okla. +, Pa. +, Tenn. +, Tex. +, Vt. +, W.Va. + and Wis. +
HabitatFloodplain forests, rich deciduous forests and forest margins, usually along streams or in ditches, wooded ravine slopes, meadows, fields and thickets, often associated with calcareous soils +
IllustratorSusan A. Reznicek +
PhenologyFruiting late spring–mid summer. +
Publication titleAnn. Lyceum Nat. Hist. New York +
Publication year1825 +
ReferenceNone +
Source xmlhttps://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse grained fna xml/V23/V23 850.xml +
Taxon familyCyperaceae +
Taxon nameCarex davisii +
Taxon parentCarex sect. Hymenochlaenae +
Taxon rankspecies +
VolumeVolume 23 +