62 Contributions from the Gray Herbarium 
typical form of the species, so apparently it has acquired a certain 
degree of stability. This form is similar to A. flavescens except that 
the sepals are salmon-color or flushed with pink. This color- 
modification is striking and extremely beautiful, well worth, it 
would seem varietal recognition. 
ACONITUM COLUMBIANUM Nutt. In the vicinity of Cape Horn, 
Custer Co., Idaho a form of this species with light-colored flowers 
(our no. 3642) seems to entirely replace the typical state which was 
found forty or fifty miles south of Cape Horn in the region of the 
Alturas Lakes. This appearance in restricted areas of forms with 
light-colored corollas has been observed before since we have at 
hand a specimen by Horner from the Blue Mts. of Washington 
which bears on the label this note, “‘ flowers all white in this 
locality.”” Neither Horner’s collection nor ours, however, appears 
to differ in any fundamental way from the typical dark-flowered 
orm, 
SisymMBrium Logseiu L. This Italian species is represented by 
our no. 2965 from Picabo, June 30, 1916. It was common along a 
roadway for some distance and will doubtless persist from year to 
year. Apparently it has not been collected in the United States 
before except in Connecticut and New York. 
DraBa vaLtipa Goodd. Bot. Gaz. xxxvii. 55 (1904). The dis- 
covery of this species in central Idaho (our no. 3138), hitherto 
known only from the Uintah Mts. of Utah is a range-extension that 
is plausible but noteworthy. 
Arabis nubigena, spec. nov., A. microphylla affinis, au minor, 
caudice lignoso multo minus ramoso, nune trifurca n ne bifurca 
tantum; caulibus 3-6 grajilibus erectis circa 8 cm. alice: foliis 
radicalibus 5-10 mm. longis fere linearibus vel anguste oblanceo- 
latis 5-10 mm. longis 1-1.5 mm. latis utrinque parce stellato- 
pubescentibus;  foliis caulinis paucis reductis glabris; floribus 
circa 4; sep alis glabris circa 3 mm. longis anguste albo-marginatis; 
coro. olla. serine Heat 5-6 mm. lo ongis; pedicellis fructiferis fere 
- longis et 1.5 mm. latis valde alatis. — IpaHo: expos 
sicins summit, Smoky Mts., Blaine Co., Aug. 13, 1916, Macbride 
& Payson, no. 3772 (Type, Gray He rb.). 
This dainty little alpine perennial is closely related to A. micro- 
phylla Nutt. which is a larger plant with larger leaves but very 
