 |
|
Southern Yellow Flax Linum medium var. texanum (Planch.) Fern. |
Dicots |  Printer Friendly Version (PDF) |
Family: Flax Family (Linaceae)
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 the 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: G5T5
A Global Rarity Rank of G5T5 means: Secure globally - Both the species as a whole and the subspecies/variety are common in the world; widespread and abundant (but may be rare in some parts of its range). Did you know? Even though Linum medium var. texanum is a variety of the species, the variety medium has double the chromosome number (n=36 verses n=18) and could be treated better as a separate species (Harris 1968). Variety texanum was described based on a specimen from Texas even though it is at the edge of its range there (Fernald 1935). |
||||
| State Ranking Justification | [-] |
There are nine existing populations but only four of them are ranked good to excellent. Most populations have fewer than 100 plants and are threatened by succession or lack of proper management. There are 10 historical populations, but most of these occur in highly developed areas so the probability of relocating them is low.
| Short-term Trends | [-] |
The short-term trends seem stable to slightly declining as most existing populations have not had dramatic changes in the last 20 years. There are a couple of populations that have been checked again and their numbers were down from previous years.
| Long-term Trends | [-] |
During the last 80 years populations on Western Long Island have disappeared while new populations were found in central and eastern Long Island in the last 20 years. This species has never been common in New York with population numbers hovering around 10 statewide.
|
Home | Advanced Search | About Us Animal Guides | Plant Guides | Community Guides © 2004-2012 New York Natural Heritage Program, a partnership between the New York State Department of Environmental Conservation and the State University of New York College of Environmental Science and Forestry Please cite this page as:
New York Natural Heritage Program. 2013. Online Conservation Guide for Linum medium var. texanum. Available from: http://www.acris.nynhp.org/guide.php?id=9168. Accessed June 19th, 2013. 
|