New York Natural Heritage Program
Slender Spikegrass
Chasmanthium laxum (L.) Yates
Monocots
Chasmanthium laxum illustration
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?
This grass had only been collected a few times in New York before the last collection in September of 1936 from Valley Stream on Long Island. Then in 1996, exactly 60 years later to the month, it was rediscovered in Eastern Long Island during a natural community inventory by New York Natural Heritage botanists Greg Edinger and David Hunt. Their discovery is still the only known occurrence in the state.

State Ranking Justification [-]
There is one existing population which was discovered in 1996. There are two historical populations known from the 1800s and early 1900s which have been surveyed but no plants were found. Three additional populations from western Long Island are considered extirpated.

Short-term Trends [-]

Long-term Trends [-]