New York Natural Heritage Program
Lake-cress
Rorippa aquatica (Eat.) Palmer & Steyermark
Dicots
Neobeckia aquatica infloresence Hugh Wilson
Family: Mustard Family (Brassicaceae)

State Protection: Threatened
listed species are those with: 1) 6 to fewer than 20 extant sites, or 2) 1,000 to fewer than 3,000 individuals, or 3) restricted to not less than 4 or more than 7 U.S.G.S. 7 minute topographical maps, or 4) listed as threatened by U.S. Department of Interior.

Federal Protection: Not Listed

State Rarity Rank: S2
A State Rarity Rank of S2 means: This plant is threatened/imperiled in New York because of rarity (typically 6-20 populations or few remaining individuals) or is vulnerable to extirpation from New York due to biological factors.

Global Rarity Rank: G4?
A Global Rarity Rank of G4? means: Apparently Secure globally (most likely) - Conservation status is uncertain, but most likely uncommon 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 firm conservation status.


Did you know?
Lake-cress appears to be sterile, reproducing only vegetatively, at least in the natural populations studied so far. It can produce clones from rhizomes, from "gemmipary" (using specialized buds on the leaf bases which can detach and produce plantlets), or from fragmentation . Fragments of stem or leaf break off easily, and may produce an entire new plant if they lodge in an appropriate substrate. Northern populations (including those in New York) may flower but have never been observed to produce seeds (Gabel and Les 2000).

State Ranking Justification [-]
There are 12 verified occurrences, and only two of these are ranked better than "fair". There are many historical occurrences which have not been inventoried.

Short-term Trends [-]

Long-term Trends [-]