Cymophyllus fraseri (Andrews) Mack.:
United States (North America)

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

The broad, straplike leaf of Cymophyllus, apparently lacking a midvein, sheath, and ligule and with finely undulate margins, is unique in Cyperaceae. This southern Appalachian endemic (R. B. Clarkson 1962) is presumably a relict, sharing the same ancestry as Carex, and has evolved the flat, “blade” of its leaf from an expanded bladeless sheath (A. A. Reznicek 1989). Both the morphology of the inflorescence and preliminary observations (W. W. Thomas 1984b) suggest the plant is entomophilous. Some individuals in populations are protandrous, and others are protogynous, but details of the reproductive biology of this species are unknown. Cymophyllus is a striking plant with its broad, evergreen leaves and gleaming white inflorescences, and it is sometimes cultivated in woodland wildflower gardens.

Culms 20–40 cm. Leaves strap-shaped, gradually tapered to base that wraps around stem, finely evenly 50–90-veined, 20–60 × 1.7–5 cm, margin finely undulate, base gradually tapered, apex broadly acute-rounded, ciliate-serrulate. Inflorescences a single androgynous spike, 1.4–2.5 × 1.1–1.5 cm; pistillate portion ± globose at maturity. Scales translucent-white. Perigynia white, becoming pale greenish at maturity, ellipsoid to broadly ellipsoid, ± inflated, circular to flattened in cross section, 4.5–6.7 × 2.2–3 mm, membranaceous; beak short, orifice entire. Stigmas thick, stiff, finely papillose. Achenes dark brown, elliptic to circular or broadly obovate in outline, 2.4–3.2 × 1.6–2.5 mm.

Carex fraserianus Ker Gawler, Bot. Mag. 34: plate 1391. 1811; C. fraseri Andrews; Cymophyllus fraseri (Andrews) Mackenzie

Fruiting early summer (May–Jun). Mesic to wet- mesic, shaded slopes and banks in rich, often rocky deciduous, mixed, or hemlock forests, local, often abundant; 400–1300 m; Ga., Ky., Md., N.C., Pa., S.C., Tenn., Va. W.Va.

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 3
Species: 3
Species With Barcodes: 1

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Species: 2
Species With Barcodes: 1

United States

Rounded National Status Rank: N4 - Apparently Secure

Rounded Global Status Rank: G4 - Apparently Secure

Comments: Cymophyllus fraserianus is threatened by the loss of quality forested habitat to development in the region, as it reacts poorly to the radical alteration of forest conditions. Poor dispersal mechanisms prevent widespread distribution, and grazing also limits this species (Southern Appalachian Species Viability Project 2002).

Comments: Treated as Carex fraseri or Cymophyllus fraseri in most floras. Kartesz and Gandhi have shown that the name Carex fraseriana was published for this slightly sooner, and therefore has nomenclatural priority; they consider this species to belong to the segregate genus Cymophyllus, and provided the new name Cymophyllus fraserianus for that taxonomic placement. LEM 17Aug94.