142 CRUCIFERAE. [Vor. II. 
5. Draba nivalis Lilj. Yellow Arctic 
Whitlow-grass. (Fig. 1759.) 
Draba nivalis VAjlj. Vet. Akad. Handl. 1793: 208. 1793. 
Perennial by a short branched caudex; scapes 
tufted, somewhat pubescent, slender, leafless or 
sometimes bearing a small sessile leaf, 1/4’ 
high. Basal leaves usually numerous, tufted, 
oblanceolate or spatulate, 2/’-7/’ long, entire, 
acutish or acute at the apex, narrowed into a 
short petiole, stellate-canescent, not ciliate, or 
slightly so near the base; flowers yellow, about 
2/’ broad; calyx pubescent; style short; pods ob- 
long or linear-oblong, narrowed at both ends, 
glabrous or but little pubescent, on ascending 
pedicels 1//-3’’ long. 
Labrador (according to Robinson), through arctic 
America to Alaska, south in the Rocky Mountains 
to Colorado, and in the Sierra Nevada to Nevada. 
Also in northern Europe and Asia. Summer. 
6. Draba incana L. Hoary or Twisted Whitlow-grass. (Fig. 1760.) 
Draba incana I. Sp. Pl. 643. 1753. 
Draba confusa Ehrh. Beitr. '7: 155. 1792. 
Perennial or biennial, erect, simple or somewhat 
branched, leafy, stellate-pubescent throughout, 6/— 
12’ high. Leaves lanceolate, oblanceolate or ovate, 
4//-12/’ long, acutish or obtuse, dentate or nearly 
entire; flowers white, 1//-1%’’ broad; petals 
notched, twice as long as the calyx; pods oblong or 
lanceolate, acute, twisted when ripe, on short nearly 
erect pedicels, densely pubescent or nearly glabrous; 
style minute. 
In rocky places, Green Mountains; Gaspé, Quebec, 
arctic America, to British Columbia, south in the Rocky 
Mountains to Colorado. Also in arctic and alpine Eur- 
ope and Asia, Called also Hunger-flower. Summer. 
Draba incana arabisans (Michx.) S. Wats. Proc. Am. 
Acad. 23: 260. 1888. 
Draba arabisans Michx. F1. Bor. Am. 2: 28. 1803. 
Stem branched below, bearing tufts of spatulate 
narrow leaves; pods glabrous, twisted; style %’’ long. 
Northern New England and New York to Labrador, 
west along the Great Lakes to Minnesota and Manitoba. 
YP WR 
7. Draba ramosissima Desy. Branching 
Whitlow-grass. (Fig. 1761.) 
Draba ramosissima Desv. Journ. Bot. 3: 186. 1814. 
Erect, much branched below, 6/18’ high, stel- 
late-pubescent throughout, the branches bearing 
tufts of leaves, the inflorescence corymbosely pan- 
iculate. Lower leaves spatulate or oblanceolate, 
1/-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. 
