''Draba weberi'' is a species of flowering plant in the family

Brassicaceae Brassicaceae () or (the older) Cruciferae () is a medium-sized and economically important family of flowering plants commonly known as the mustards, the crucifers, or the cabbage family. Most are herbaceous plants, while some are shrubs. The leav ...

known by the common names Weber's whitlow-grass and Weber's draba. It is narrowly

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found else ...

to Summit and Park Counties,

Colorado Colorado (, other variants) is a state in the Mountain states, Mountain West subregion of the Western United States. It encompasses most of the Southern Rocky Mountains, as well as the northeastern portion of the Colorado Plateau and the wes ...

, where several populations were estimated to total to approximately 300 individuals as of 2012. ''D''. ''weberi'' is principally threatened by alterations to its hydrologic environment, owing to its preference for wet, rocky streamside crevices. ''Draba weberi'' is a

perennial A perennial plant or simply perennial is a plant that lives more than two years. The term ('' per-'' + '' -ennial'', "through the years") is often used to differentiate a plant from shorter-lived annuals and biennials. The term is also wid ...

herb which grows in small, dense tufts with

pubescent The adjective pubescent may describe: * people or animals undergoing puberty * plants that are hairy, covered in trichomes * insects that are covered in setae In biology, setae (singular seta ; from the Latin word for "bristle") are any of a ...

stems 2 to 6 centimeters long. Flowering occurs from June to July, whereupon five to 15 small yellow flowers are produced per stem. Along with several other members of the genus ''

Draba ''Draba'' is a large genus of flowering plants in the family Brassicaceae, commonly known as whitlow-grasses (though they are not related to the true grasses). Species There are over 400 species: *'' Draba abajoensis'' Windham & Al-Shehbaz *'' ...

'', ''D. weberi'' produces sterile pollen and reproduces asexually through

agamospermy In botany, apomixis is asexual reproduction without fertilization. Its etymology is Greek for "away from" + "mixing". This definition notably does not mention meiosis. Thus "normal asexual reproduction" of plants, such as propagation from cuttin ...

. Consequently, its seeds are formed without fertilization and carry only maternal genes.

References

{{Taxonbar, from=Q15465995 Flora of Colorado weberi