GENUS i. 



MUSTARD FAMILY. 



Draba stylaris J. Gay. Canescent Whitlow-grass. 

 Fig. 2004. 



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

 '. confnsa Reichenb. Ic. Crit. 8: 1033. 1830. Not Ehrh. 



erennial or biennial ; flowering stems simple or little 

 nched, 15' high or less, loosely pilose. Basal leaves ob- 

 lanceolate, few-toothed, \'-\\' long, densely stellate-canescent; 

 stem-leaves oblong-lanceolate to ovate, somewhat toothed or 

 entire, more or less stellate-canescent; flowers white; fruit- 

 ing pedicels nearly erect, \"-2\" long; pods oblong to lanceo- 

 late, 3i"-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 megasperma 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 pycnosperma Fernald & Knowlton, of limestone cliffs 

 and ledges in Quebec, has shorter pods with crowded angled seeds. 



9. Draba ramosissima Desv. Branching 



Whitlow-grass. Fig. 2005. 

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



Erect, much branched below, 6'-i8' high, stellate- 

 pubescent throughout, the branches bearing tufts 

 of leaves, the inflorescence corymbosely paniculate. 

 Lower leaves spatulate or oblanceolate, i'-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, i"-2" long. 



Mountains of Virginia and Kentucky, south to North 

 Carolina and Tennessee. April-May. 



10. Draba brachycarpa Nutt. Short-fruited 

 Whitlow-grass. Fig. 2006. 



Draba brachycarpa Nutt. ; T. & G. Fl. N. A. i : 108. 1838. 



Annual, tufted, 2'-$' high, loosely stellate-pubes- 

 cent, leafy to the inflorescence. Basal leaves ovate 

 or obovate, 4"-6" long, obtuse, sparingly dentate or 

 entire; stem-leaves smaller, sessile, oblong, entire; 

 pedicels ascending, i"-2" long in fruit; raceme 

 elongating; flowers yellow, i" broad; petals some- 

 what longer than the calyx, sometimes wanting; 

 pods oblong, acute, iJ"-2" long, J" broad; style 

 minute. 



__ Dry hills and fields, Virginia to Illinois, Missouri, 

 Kansas, Georgia, Louisiana and Arkansas. Montana to 

 Oregon. March-May. 



