1905] Fernald & Knowlton,— Draba incana and its Allies 65 
Waghorne): New BRUNSWICK, dry rocks, Nashwaak, 1881 (J. Moser, 
Herb. N. B. Nat. Hist. Soc): VERMONT, dry cliffs, Willoughby Mt. 
(Zuckerman, H. Mann, et al.); dry cliffs, Smuggler’s Notch, Mt. 
Mansfield, Aug. 2, 1893 (W. W. Eggleston): COLORADO, South 
Park, 1873 (Wolf & Rothrock, no. 631): ALBERTA, Bow River Pass, 
Sept. 13, 1879 (7. Macoun): BritisH CoLuMBIA, Macleod's Lake, 
Lat. 55°, June 21, 1875 (/. Macoun, no. 157). 
++ Mature seeds 1.33-1.5 mm. long. 
D. megasperma, n. sp. (Figs. 6-8). Perennial; caudex stout 
and branching: flowering stems 2 to 25, 1-3 dm. high, simple or 
loosely branched, scabrous-puberulent with stellate hairs, remotely 
leafy: basal rosettes numerous; their leaves spatulate, harsh with 
canescent-stellate hairs, entire or rarely dentate, 1-3 cm. long; 
cauliae leaves, 3 to ro, oblong-ovate, sub-entire, 1-1.5 cm. long, 
sparingly stellate: racemes loose; pedicels sub-ascending, in fruit 
becoming r.5-5 mm. long, glabrate: siliques elliptic, flat or barely 
twisted, 5-11 mm. long, 3-4 mm. broad, sparingly harsh-stellate, 
finally glabrate; stigmas sub-sessile : seeds not crowded. — QUEBEC, 
gravelly beach, Paspébiac Lighthouse, Bonaventure County, July 26, 
1902 (Williams & Fernald). 
Superficially resembling D. borealis, DC., of the Behring Sea 
region, a plant with longer looser pubescence, more elongate fruiting 
pedicels, and thinner less canescent leaves. 
+ + Siliques glabrous from the first. 
++ Seeds not crowded, their edges rounded. 
D.ARABISANS, Michx. (Fig. 9.) Perennial; caudex branching: 
flowering stems 1 to 40, simple or loosely branched, 1.5-4.5 dm. 
high, sparingly pubescent: basal rosettes numerous; their leaves 
oblanceolate or spatulate, entire or somewhat dentate, thin, green, 
thinly stellate-pubescent, 1-7 cm. long; cauline leaves 4-13, oblance- 
olate, serrate-dentate, 1-4.5 cm. long, otherwise like the basal: 
racemes loose; pedicels divergent, in fruit becoming 4-10 mm. 
long: siliques elliptic-lanceolate, much twisted, 9-15 mm. long, 
1.5-3 mm. wide; style definite: seeds 1-1.5 mm. long.— Fl. Bor.- 
Am. ii. 28 (1803); DC., Syst. ii. 349 (1821) and Prodr. i. 170 
(1824); Torr. & Gray, Fl. N. Am. i. 106 (1838); Torr., Fl. N. Y. 
1.62 (1843); Gray, Gen. i. 160, t. 68 (1848) and Man. 39, (1848). 
