New York Natural Heritage Program
Water Pigmyweed
Crassula aquatica (L.) Schoenl.
Dicots
Crassula aquatica Stephen M. Young
Family: Stonecrop Family (Crassulaceae)

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?
Water pigmyweed is everywhere and nowhere. It is a very widespread species in the colder regions of Europe and the Western Hemisphere but it is often overlooked because it is so small, has inconspicuous flowers and lives in rarely explored aquatic habitats. In New York it is even harder to see because it occurs in freshwater tidal areas where it is only visible for a few hours each day.

State Ranking Justification [-]
There are two large populations and one very small population which may be extirpated. There are four historical populations which need to be surveyed in more detail but they probably no longer exist.

Short-term Trends [-]

Long-term Trends [-]