150 CRUCIFERAE. [Vor. II. 
1o. Arabis brachycarpa (T. &.G.) Britton. Purple Rock-cress. (Fig. 1780.) 
Turritis brachycarpa T. & G. Fl, N. A. 1: 79. 1838. 
Arabis confinis §, Wats. Proc. Am. Acad. 22: 466. 
Anrodcadpa Britton, Mem. Torr. Club, 5: 174. 1894. 
Biennial, somewhat glaucous, generally pur- 
plish, glabrous except at the base, simple or 
sparingly branched, 1°-3° high. Basal leaves 
stellate-pubescent, obovate or spatulate, 1/—3/ 
long, dentate, narrowed into a petiole; stem 
leaves sessile, auricled at the base, lanceolate or 
oblong-linear, about 1’ long, entire or with a 
few teeth; pedicels erect or spreading, 3//-5/’ 
long in fruit; flowers white or pink, 4’ broad; 
petals twice the length of the calyx; pods nar- 
rowly linear, nearly straight, 1/-3’ long, 1/7 
wide, loosely erect or ascending; seeds in 2 rows 
in each cavity, oblong, wing-margined. 
Quebec to Manitoba and the Northwest Territory, 
south to Massachusetts, western New York, IIli- 
nois and Minnesota, June-July. 
uz. Arabis glabra (L.) Bernh. ‘Tower Mustard. ci 
(Fig. 1781.) f | 
/ 
Turritis glabra I,. Sp. Pl. 666. 1753. } 
Arabis glabra Bernh. Verz. Syst. Erf. 195. 1800. \ 
\ 
N|— 
| 
Arabis perfoliata Lam, Encycl. 1: 219. 1783. ' 
Biennial, erect, glabrous and decidedly glaucous above, \, { 
pubescent at the base, nearly simple, 2°-4° high. Basal yf 
leaves petioled, 2-10’ long, oblanceolate or oblong, dentate , i 
or sometimes lyrate, hairy with simple pubescence, or with +. 
hairs attached by the middle; stem-leaves sessile, with a ‘i G 
sagittate base, glabrous, entire or the lower sparingly den- 3 
tate, 2’-6’ long, lanceolate or oblong, acutish; pedicels 2’/— 
6’” long, erect; flowers yellowish-white, 2’” broad; petals 
slightly exceeding the calyx; pods narrowly linear, 2/—3/ 
long, %4’’ wide, strictly erect and appressed; seeds in 2 
rows, marginless, or narrowly winged; style none. Nii 2 
In fields and rocky places, Quebec to southern New York and \\ f 
Pennsylvania, west to the Pacific Coast. Appearsin some places 
as if not indigenous. Also in Europe and Asia. May—Aug. 4 
12. Arabis Holboéllii Hornem. MHolboell’s Rock-cress. (Fig. 1782.) 
A. Holboellii Hornem., Fl. Dan. 11: pi. 1879. 1827- 
Arabis retrofracta Graham, Edinb. Phil. Journ. 
1829, 344. 1829. 
Erect, simple or branching above, 10’-24’ 
high, stellate-pubescent, hirsute or even nearly 
glabrous. Lower leaves spatulate or oblance- 
127. 
olate, tufted, petioled, !4’-2’ long, obtuse, en- 
tire or sparingly toothed; stem-leaves sessile, 
erect, clasping by a narrow auricled base; 
pedicels slender, reflexed or the upper as- 
cending, 3/’-5’’ long in fruit; flowers purple 
or whitish, 3//-4’’ long, becoming pendent 
petals twice the length of the calyx; pods lin- 
ear, I/-2’ long, slightly more than 13’ wide, 
drooping; seeds margined, indistinctly in 2 
rows in each cell; style very short or none. 
Lake Nepigon (according to Macoun) and 
throughout arctic America, extending south in 
the Rocky Mountains and the Sierra Nevada to 
New Mexico and California. Summer. 
