Arabis adpressipilis (M. Hopkins) Al-Shehbaz. Slender Rockcress, Hairy Rockcress. Phen: Apr-May; May-Jun. Hab: Thin soils near outcrops of mafic or other rock weathering to nutrient-rich soils. Dist: OH to IL, south to c. TN and AR; disjunct east of the Blue Ridge Mountains in NC.

Origin/Endemic status: Native

Taxonomy Comments: A. pycnocarpa and A. adpressipilis are related to but clearly specifically distinct from A. hirsuta (Linnaeus) Scopoli of Europe and A. eschscholtziana Andrzejowski of w. North America. Al-Shebbaz (2017) discusses the rationale for treating A. pycnocarpa and A. adpressipilis at species rank.

Synonymy: = K4, Al-Shehbaz (2017); = Arabis hirsuta (L.) Scop. var. adpressipilis (M.Hopkins) Rollins – C, F, G, Pa, Al-Shehbaz (1988a), Rollins (1993); = Arabis pycnocarpa M.Hopkins var. adpressipilis M.Hopkins – FNA7, Il, K3, NY, Tn, Va, Hopkins (1937); = n/a – RAB; < Arabis hirsuta (L.) Scop. – S13; < Arabis hirsuta (L.) Scop. var. pycnocarpa (M.Hopkins) Rollins – K1; > Arabis ovata Michx. – S, misapplied

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Heliophily: 7