Difference between revisions of "Carex davisii"
Ann. Lyceum Nat. Hist. New York 1: 326. 1825.
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|common_names=Davis’ sedge | |common_names=Davis’ sedge | ||
+ | |special_status={{Treatment/ID/Special_status | ||
+ | |code=F | ||
+ | |label=Illustrated | ||
+ | }}{{Treatment/ID/Special_status | ||
+ | |code=E | ||
+ | |label=Endemic | ||
+ | }} | ||
|basionyms= | |basionyms= | ||
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name=Carex davisii | name=Carex davisii | ||
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|authority=Schweinitz & Torrey | |authority=Schweinitz & Torrey | ||
|rank=species | |rank=species | ||
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|publication title=Ann. Lyceum Nat. Hist. New York | |publication title=Ann. Lyceum Nat. Hist. New York | ||
|publication year=1825 | |publication year=1825 | ||
− | |special status= | + | |special status=Illustrated;Endemic |
− | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V23/V23_850.xml |
|genus=Carex | |genus=Carex | ||
|section=Carex sect. Hymenochlaenae | |section=Carex sect. Hymenochlaenae |
Latest revision as of 21:43, 5 November 2020
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](/w/images/b/bf/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.
Selected References
None.