Facts about Deergrass (Trichophorum cespitosum)

Scirpus caespitosus L.:
Canada (North America)
Greenland (North America)
United States (North America)

Böcher, T. W., K. Holmen & K. Jacobsen. 1968. Fl. Greenland (ed. 2) 312 pp. http://www.tropicos.org/Reference/1507
Small, J. K. 1933. Man. S.E. Fl. i–xxii, 1–1554. Published by the Author, New York. http://www.tropicos.org/Reference/1515

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Scirpus cespitosus L.:
Canada (North America)
United States (North America)

Anonymous. 1986. List-Based Rec., Soil Conserv. Serv., U.S.D.A. Database of the U.S.D.A., Beltsville. http://www.tropicos.org/Reference/1103
Gleason, H. A. & A. Cronquist. 1968. The Pteridophytoa, Gymnospermae and Monocotyledoneae. 1: 1–482. In H. A. Gleason Ill. Fl. N. U.S. (ed. 3). New York Botanical Garden, New York. http://www.tropicos.org/Reference/1495
Cronquist, A., A. H. Holmgren, N. H. Holmgren & J. L. Reveal. 1977. Vascular Plants of the Intermountain West, U.S.A. 6: 1–584. In A. J. Cronquist, A. H. Holmgren, N. H. Holmgren, J. L. Reveal & P. K. Holmgren (eds.) Intermount. Fl. Hafner Pub. Co., New York. http://www.tropicos.org/Reference/1725

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Trichophorum caespitosum (L.) Hartm.:
Canada (North America)
Greenland (North America)
United States (North America)

Tolmatchev, A. I. 1966. Cyperaceae. Arktic. Fl. SSSR 3: 1–176. http://www.tropicos.org/Reference/10154

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National Distribution

Canada

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Global Range: Circumboreal, south in w. N. America to OR, UT, and MT. Sparse.

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Morphology

Comments

Segregates defined on the basis of characters such as the number of flowers per spike and distal leaf sheath morphology have been recognized at varietal or subspecific ranks in North America and Europe. In North America, at least, these characters are variable within populations and appear to have no geographic integrity. North American plants of Trichophorum cespitosum appear to be identical to subsp. cespitosum (cf. R. A. DeFilipps 1980). No cytological differences have been detected between European and North American populations; all counted plants have 2n = 104 or n = 52.

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Description

Plants densely cespitose; rhizomes absent. Culms grooved, terete, 5–45 cm, smooth. Leaves: basal sheaths brown; distal leaf sheaths concave at mouth; blades 1.5–8 × 0.3–0.4 mm, much shorter than culms at flowering and fruiting. Inflorescences: spikelets 3–9-flowered, 3.3–7 × 1.2–3 mm; bracts equaling spikelets, 3.3–4.5 mm, apex with awn less than 1 mm. Spikelets: scales reddish brown to dark brown, apex mucronate to acute. Flowers: perianth bristles 6, brown, terete, equaling or exceeding achenes, smooth to scabrous; anthers 1.5–2.6 mm. Achenes compressed trigonous, 1.4–1.7 × 0.6–0.9 mm. 2n = 104.

Flora of North America @ eFloras.org

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Diagnostic Description

Synonym

Scirpus cespitosus Linnaeus, Sp. Pl. 1: 48 1753; Baeothryon cespitosum (Linnaeus) A. Dietrich; Scirpus bracteatus Bigelow; S. cespitosus var. callosus Bigelow; S. cespitosus var. delicatulus Fernald

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Scirpus cespitosus could easily be mistaken for a species of Eleocharis; however, the former has spikelets subtended by a short-awned scale, while the latter do not. ELEOCHARIS CESPITOSUS forms large, distinctive tussocks.

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Habitat

Habitat & Distribution

Fruiting summer (May–Aug). Open, wet, rocky or peaty meadows, fens, bogs, shores; 0–2100 m; Greenland; Alta., B.C., Man., N.B., Nfld. and Labr., N.W.T., N.S., Nunavut, Ont., P.E.I., Que., Sask., Yukon; Alaska, Idaho, Maine, Mont., N.H., N.Y., N.C., Oreg., S.C., Tenn., Utah, Vt., Wash.; Europe; montane c Asia, boreal w Asia.

Flora of North America @ eFloras.org

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Associations

In Great Britain and/or Ireland:
Foodplant / parasite
immersed sorus of Anthracoidea scirpi parasitises live ovary of Trichophorum cespitosum x germanicum (T. x foersteri)
Remarks: season: 8

Source: BioImages - the Virtual Fieldguide (UK)

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Associations

Foodplant / parasite
immersed sorus of Anthracoidea scirpi parasitises live ovary of Trichophorum cespitosum ss.
Remarks: season: 8
Other: major host/prey

Source: BioImages - the Virtual Fieldguide (UK)

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Associations

In Great Britain and/or Ireland:
Foodplant / parasite
immersed sorus of Anthracoidea scirpi parasitises live ovary of Trichophorum cespitosum agg.
Remarks: season: 8
Other: sole host/prey

Foodplant / saprobe
fruitbody of Coprinopsis martinii is saprobic on decayed debris of Trichophorum cespitosum agg.

Source: BioImages - the Virtual Fieldguide (UK)

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Molecular Biology

Statistics of barcoding coverage: Trichophorum cespitosum

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 4
Species: 11
Species With Barcodes: 1

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Source: Barcode of Life Data Systems (BOLD)

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Statistics of barcoding coverage: Scirpus caespitosus

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

Source: Barcode of Life Data Systems (BOLD)

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Statistics of barcoding coverage: Trichophorum caespitosum

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Species: 11
Species With Barcodes: 1

Source: Barcode of Life Data Systems (BOLD)

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Conservation Status

National NatureServe Conservation Status

Canada

Rounded National Status Rank: N5 - Secure

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: G5 - Secure

Source: NatureServe

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Threats

Comments: Air pollution is a potential threat to high elevation habitats (Southern Appalachian Species Viability Project 2002).

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Taxonomy

Comments: Name correctly spelled 'Scirpus cespitosus' and not 'Scirpus caespitosus', see ICBN Art. 60.1, Example 1 (re retention of original spellings). LEM 22Feb94, rev. 18Oct01.

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