New York Natural Heritage Program
Pale Duckweed
Lemna valdiviana Phil.
Monocots
Family: (Lemnaceae)

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 little plant gets around. Its range extends from New Hampshire all the way down to southern South America. It was first described from plants collected in 1861 in Valdivia, Chile, thus its species name. It was named by Rodolfo Armando Philippi, a German-born scientist who moved to Chile in 1851 (Wikipedia contributors).

State Ranking Justification [-]
There are two existing populations but their size and quality are unknown. Six additional historical populations were known from the late 1800s to 1974 and these have not been resurveyed.

Short-term Trends [-]

Long-term Trends [-]