New York Natural Heritage Program
Stiff Tick-trefoil
Desmodium obtusum (Muhl. ex Willd.) DC.
Desmodium obtusum plant David Werier
Family: Pea Family (Fabaceae)

State Protection: Endangered
listed species are those with: 1) 5 or fewer extant sites, or 2) fewer than 1,000 individuals, or 3) restricted to fewer than 4 U.S.G.S. 7 minute topographical maps, or 4) species listed as endangered by U.S. Department of Interior.

Federal Protection: Not Listed

State Rarity Rank: S1
A State Rarity Rank of S1 means: This plant is endangered/critically imperiled in New York because of extreme rarity (typically 5 or fewer populations or very few remaining individuals) or is extremely vulnerable to extirpation from New York due to biological factors.

Global Rarity Rank: G4G5
A Global Rarity Rank of G4G5 means: Apparently or Demonstrably Secure globally - Uncommon to common in the world, but not rare; usually widespread, but may be rare in some parts of its range; possibly some cause for long-term concern due to declines or other factors. More information is needed to assign a single conservation status.

Did you know?
The genus name derives from the Greek word desmos, meaning bond or chain, and refers to the connection between the segments of the fruit. The species name refers to the blunt-tipped leaves. The common name of this species is in reference to the fruit's ability to stick to animals like ticks. Trefoil refers to the three stiff leaflets that make up each leaf.

State Ranking Justification [-]
There are three existing populations, one of good quality, one of fair quality and under threat, and one without any quality information. There are four historical records from 1882 to 1906.

Short-term Trends [-]

Long-term Trends [-]