220 BOTANICAL GAZETTE [MARCH 
long or the basal one longer: flowers disproportionately large: 
sepals narrowly linear-lanceolate, 5-6 cm. long, tapering very 
gradually into the slender tip, bluish green with green midrib and 
white scarious margins: petals obovate-cuneate (either narrowly 
or broadly), rather abruptly rounded into the short lanceolate 
acute tip, as long as or somewhat longer than the sepals, delicate in 
texture, pale blue with greenish tinge and a narrow green stripe from 
apex to the gland; gland small, within 5 mm. of the base, bordered 
at sides and apex with flat yellow hairs, the upper four-fifths of the 
petal wholly glabrous: anthers yellow, 12-14 mm. long, exceeding 
the filaments: capsule narrow, nearly as long as the sepals. 
Probably most nearly related to C. macrocarpus Dougl., from which it is 
easily distinguished by its slender habit, color of flowers and anthers, and the 
nearly glabrate petal face. Secured by MAcsrRIDE on the dry slopes of the 
foothills of the Boise Mountains, June 18, 1910, no. 268. 
\ Arabis arcoidea, n. sp.—Perennial from a low multicipital 
caudex surmounting the rather slender woody taproot: stems few 
to several, simple, slender, erect, 2-5 dm. high, including the long 
raceme, rather densely short-hirsute below, glabrate above, the 
pubescence simple or branched (not stellate): leaves entire, 
crowded-rosulate on the crowns, narrowly linear-spatulate, taper- 
ing gradually into the very slender base, 4-6 cm. long (including 
the base), grayish green with a dense substellate pubescence; 
stem leaves several, auriculate-clasping at base, smaller, linear, 
rather distant, gradually reduced to small glabrate bracts above: 
inflorescence, wholly glabrous: sepals oblong, obtuse, with greenish 
base and thin purplish tips: petals purplish to violet, spatulate, 
about 8 mm. long, twice as long as the sepals: stamens scarcely 
longer than the sepals: pods glabrous, narrowly linear (less than 
1.5 mm. broad), 4-6 cm. long, arcuate spreading, on ascending 
pedicels 5-10 mm. long; seeds in one row, very thin, with wings 
more than half as broad as the body. 
I am unable to refer this to any close ally. If one had only the young 
plants, one would refer it by reason of the aspect of the basal leaves to 
A, canescens Nutt., to which it may be somewhat related in spite of the very 
different pods and pubescence. Secured by Macpripe at New Plymouth, 
Canyon County, on dry sandy soils, May 21, 1910, no. 87. 
