7. Draba Arábisans Michx. Rock-Cress Whitlow-Grass

Fig. 2003

D. arabisans Michx. Fl. Bor. Am. 2: 28. 1803. D. incana arabisans S. Wats. Proc. Am. Acad. 23:

260. 1888. D. arabisans orthocarpa Fernald, Rhodora 7: 66.


Perennial by a slender branched caudex, the flowering stems 6'-2o' high, sparingly stellate-pubescent, often numerous. Leaves thin, green, loosely and mostly sparingly stellate-pubescent, the tufted basal ones spatulate to oblanceolate, 1/2'-2 1/2' long, 2"-4" wide, usually remotely dentate, sometimes entire, those of the flowering stems similar, oblong to spatulate; flowers white; fruiting pedicels slender, divergent-ascending, 5" long or less; pods narrowly oblong, glabrous, 3"-7" long, 1"-2" wide, twisted or straight.

On cliffs and in rocky and sandy soil, Newfoundland and Labrador to Maine, Vermont, northern New York and western Ontario. June-Aug.

8. Draba Stylàris J. Gay. Canescent Whitlow-Grass

Fig. 2004

Draba stylaris J. Gay, in Thomas, Cat. 1818.

D. confusa Reichenb. Ic. Crit. 8: 1033. 1830. Not Ehrh.

Perennial or biennial; flowering stems simple or little branched, 15' high or less, loosely pilose. Basal leaves ob-lanceolate, few-toothed, 1/2'-1 1/2' long, densely stellate-canescent; stem-leaves oblong-lanceolate to ovate, somewhat toothed or entire, more or less stellate-canescent; flowers white; fruiting pedicels nearly erect, 1"-2 1/2" long; pods oblong to lanceolate, 3 1/2"-6" long, mostly twisted when mature, stellate-canescent.

Cliffs and rocks, Newfoundland and Labrador to the mountains of Vermont; Alberta and British Columbia; Colorado. Europe. Previously confused with D. incana L.

Draba megaspérma Fernald & Knowlton, found on a gravelly beach in Bonaventure County, Quebec, differs in having broader pods, larger seeds and the flowering stems stellate-canescent.

Draba pycnospérma Fernald & Knowlton, of limestone cliffs and ledges in Quebec, has shorter pods with crowded angled seeds.

8 Draba Styl Ris J Gay Canescent Whitlow Grass 3468 Draba Styl Ris J Gay Canescent Whitlow Grass 347

9. Draba Ramosissima Desv. Branching Whitlow-Grass

Fig. 2005

Draba ramosissima Desv. Journ. Bot. 3: 186. 1814.

Erect, much branched below, 6'-18' high, stellate-pubescent throughout, the branches bearing tufts of leaves, the inflorescence corymbosely paniculate. Lower leaves spatulate or oblanceolate, l'-2' long, acute, dentate with spreading teeth; upper leaves oblong or ovate, similarly dentate; branches of the panicle erect or ascending; flowers white, 2"-3" broad; petals entire or erose, twice or thrice the length of the sepals; pedicels spreading or ascending, 3"-4" long in fruit; pods oblong or lanceolate, hairy, 3"-4" long, twisted; style slender, 1"-2" long.

Mountains of Virginia and Kentucky, south to North Carolina and Tennessee. April-May.