''Arabis pycnocarpa'', the slender rock cress, is a
species
A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...
of flowering plant in the family
Brassicaceae
Brassicaceae () or (the older but equally valid) Cruciferae () is a medium-sized and economically important Family (biology), family of flowering plants commonly known as the mustards, the crucifers, or the cabbage family. Most are herbaceous pla ...
. It is native to North America and eastern Asia, being found in rocky,
calcareous
Calcareous () is an adjective meaning "mostly or partly composed of calcium carbonate", in other words, containing lime (mineral), lime or being chalky. The term is used in a wide variety of Science, scientific disciplines.
In zoology
''Calcare ...
areas.
Description
It is a small perennial or biennial that has white flowers in the spring.
Two varieties have been named that are distinguished by pubescence differences:
Flora of North America
/ref>
*''Arabis pycnocarpa'' var. ''adpressipilis'' – native only to eastern North America
*''Arabis pycnocarpa'' var. ''pycnocarpa'' – widespread across North America and Asia
See also
* List of ''Arabis'' species
References
pycnocarpa
Flora of Northern America
Flora of temperate Asia
Plants described in 1937
{{Brassicales-stub