Flora of North America species comparison

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Arabis pycnocarpa var. pycnocarpa
Photo is of parent taxon

blushing rock-cress, hairy fruit rock cress, hairy rockcress
Stems

usually hirsute basally, rarely glabrescent, trichomes often simple, sometimes branched.
Basal leaves

blade surfaces sparsely to densely pubescent, trichomes simple and stalked.
Fruits

(3.5–)4–5.8(–6) cm;

style (0.2–)0.5–1 mm, (rarely stout).
2n

= 32.

Arabis pycnocarpa var. pycnocarpa
Phenology Flowering Mar–Jul.
Habitat Bluffs, cliffs, ledges, rocky hillsides, open woods, bottom lands, gravel bars, meadows, streamsides, upland prairies, grassy swales, hillsides, stream bottoms
Elevation 0-2500 m (0-8200 ft)
Distribution
from FNA
AK; AZ; CA; CO; CT; IA; ID; KS; MA; ME; MI; MN; MT; ND; NE; NH; NJ; NM; NV; NY; OH; OR; PA; SD; UT; VA; VT; WI; WV; WY; AB; BC; LB; MB; NB; NS; NT; ON; QC; SK; YT; Asia (China, Japan, Russian Far East)
[BONAP county map]
Discussion

Some populations in northern Indiana and northern Illinois, [e.g., Herman 8790 (Jo Davies County) and Friesner 19072 (Elkhart County), both at GH] most likely represent hybrids between the two varieties of Arabis pycnocarpa. Trichomes borne proximally on stems of these plants are a mixture of forked and simple. It is expected that hybrids can be found where the ranges of the two taxa overlap.

(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. adpressipilis
Synonyms A. hirsuta var. minshallii, A. pycnocarpa var. reducta
Name authority unknown
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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