New York Natural Heritage Program
Slender Crabgrass
Digitaria filiformis (L.) Koel.
Monocots
Digitaria filiformis USDA-NRCS
Family: Grass Family (Poaceae)

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: G5
A Global Rarity Rank of G5 means: This species is demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.


Did you know?
The name for the genus comes from the Latin for finger and refers to the fingerlike flowering stalks of the genus (Fernald 1950). Even though some species of crabgrass are known for their weediness in lawns, Digitaria filiformis is not weedy even though it can occur in habitats preferred by weeds, like roadsides and open sandy areas. It may often be overlooked because it is small and delicate.

State Ranking Justification [-]
There are 5 existing populations, but only one population has over 100 plants. There are 30 historical occurrences, but almost all very old records are from western Long Island and New York City and are considered extirpated.

Short-term Trends [-]

Long-term Trends [-]