New York Natural Heritage Program
Green Rock-cress
Boechera missouriensis (Greene) Al-Shehbaz
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 ½ 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: 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 genus, named for the Danish botanist Tyge Wittrock Böcher, is endemic to North America. The species is named for the State of Missouri. Green rock-cress is considered a facultative biennial. It puts forth a rosette of basal leaves in its first year, then produces a flowering stalk the following or a subsequent year (dependending on conditions), after which the individual plant dies.

State Ranking Justification [-]
There are 12 known populations in New York. One of these is protected at a Nature Conservancy preserve. Since there appears to be plenty of suitable habitat, the causes of this plant's rarity are not well understood. There are about 12 additional historical records, and potential habitat still to be checked across the state.

Short-term Trends [-]

Long-term Trends [-]