Flora of North America species comparison

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Arabis pycnocarpa var. adpressipilis
Photo is of parent taxon
Stems

pilose, trichomes appressed, malpighiaceous, or minutely stalked, forked, plants rarely glabrescent.
Basal leaves

blade surfaces pubescent, trichomes sessile, forked, and/or stellate.
Fruits

(4–)4.5–6(–6.5) cm;

style 0.5–1.3 mm.

Arabis pycnocarpa var. adpressipilis
Phenology Flowering Mar–Jun.
Habitat Ravines, pastures, cliffs, calcareous talus, dolomite glades, rich woods, bluffs, rocky ledges
Elevation 0-300 m (0-1000 ft)
Distribution
from FNA
IA; IL; IN; KS; MO; NY; OH; PA; TN; VA; ON
[BONAP county map]
Discussion

R. C. Rollins (1941, 1993) recognized both pycnocarpa and adpressipilis as distinct varieties of Arabis hirsuta; G. A. Mulligan (1996) treated adpressipilis as a synonym of A. hirsuta var. pycnocarpa. In my opinion, the differences in trichome morphology of the stems and leaves are significant enough to justify recognition of infraspecific taxa of one species.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 7, p. 260.
Parent taxa Brassicaceae > tribe Arabideae > Arabis > Arabis pycnocarpa
Sibling taxa
A. pycnocarpa var. pycnocarpa
Synonyms A. hirsuta var. adpressipilis
Name authority M. Hopkins: Rhodora 39: 117. (1937)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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