New York Natural Heritage Program
Jacob's-ladder
Polemonium vanbruntiae Britt.
Dicots
Polemonium vanbruntiae flowers Troy Weldy
Family: Phlox Family (Polemoniaceae)

State Protection: Rare
listed species have: 1) 20 to 35 extant sites, or 2) 3,000 to 5,000 individuals statewide.

Federal Protection: Not Listed

State Rarity Rank: S3
A State Rarity Rank of S3 means: This plant is rare in New York (typically 21-50 populations, limited number of individuals, or limited range).

Global Rarity Rank: G3G4
A Global Rarity Rank of G3G4 means: Vulnerable globally, or Apparently Secure -- At moderate risk of extinction, with relatively few populations or locations in the world, few individuals, and/or restricted range; or uncommon but not rare globally; 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 single conservation status.


Did you know?
Jacob's-ladder was described as a new species in 1870 by N. L. Britton of the New York Botanical Garden and named after Mrs. Cornelius Van Brunt who made excellent collections from the Catskill Mountains of New York. New York has the greatest number of populations and some of the largest populations of Jacob's-ladder in the world.

State Ranking Justification [-]
There are 31 known sites and over 20 historical populations. A review of the known sites may show a high level of interaction and gene flow between the sites, whereby multiple "sites" may represent a single population. As a rough guess, New York likely has 10-15 populations represented by 31 sub-populations. Many of these sites are in isolated wetlands and/or within protected landscapes. While rare, this plant is well-protected within New York.

Short-term Trends [-]

Long-term Trends [-]