Forked three-awned grass (Aristida basiramea) COSEWIC assessment and status report: chapter 10

Evaluation and Proposed Status

Existing Protection or Other Status

Global Rank: G5; Secure – Common, widespread, and abundant (although it may be rare in parts of its range, particularly on the periphery). Not vulnerable in most of its range. Typically with considerably more than 100 occurrences and more than 10,000 individuals (assigned 1984) (NatureServe, 2001).

National Rank (US): N2N4 (A range of uncertainty about the exact status of the element, from N2 (Imperiled in the nation because of rarity or because of some factor(s) making it very vulnerable to extirpation from the nation or subnation. Typically 6 to 20 occurrences or few remaining individuals (1,000 to 3,000) to N4 (Apparently Secure, uncommon but not rare, and usually widespread in the nation or subnation. Possible cause of long-term concern. Usually more than 100 occurrences and more than 10,000 individuals) (assigned 1998) (NatureServe, 2001).

US State Ranks: SR (Reported – often indicates species not yet reviewed locally) in Alabama, Florida, Indiana, Kansas, Massachusetts, Minnesota, Mississippi, Missouri, Nebraska, New Hampshire, North Dakota, Oklahoma, Tennessee, Texas, Vermont, and Wisconsin; S1 (Critically imperiled) in Colorado; S1/S2 (Critically imperiled) in Maine; S3 (Vulnerable) in Iowa; S3? (Vulnerable, but with some degree of uncertainty) in Illinois; S? (Rank not yet assessed) in Michigan; SE (Exotic) in New York (NatureServe, 2001).

National Rank (Canada): N1 (Critically imperiled – Critically imperiled in the nation because of extreme rarity or because of some factor(s) making it especially vulnerable to extirpation. Typically 5 or fewer occurrences or very few remaining individuals (<1,000) (assigned 1989) (ONHIC, 2001).

Ontario Rank: S1 (Extremely Rare – Extremely rare in Ontario; usually 5 or fewer occurrences in the province or very few remaining individuals; often especially vulnerable to extirpation (assigned 1994) (ONHIC, 2001).

Quebec Rank: Considered indigenous to Quebec by Jacques Cayouette and Jacques Brisson. “It will be added to our list of threatened/vulnerable plants in the near future with an S1 rank for Quebec.” (Jacques Labreque, pers. comm. 2000, cited in Oldham 2002).

Manitoba Rank: SRF (reported falsely) (Given the age of the reports, the likelihood of misidentification, and the fact that they have never been confirmed. Greenall, pers. comm. 2003.)

OMNR Designation: None

COSEWIC Designation: Endangered

Ontario General Status: May Be At Risk (assigned 2000) (ONHIC, 2001)

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