64 BOTANY. 
SisyMBRIUM CANESCENS, Nutt.—Colorado and Nevada. From Ash 
Creek, Arizona, I have specimens (306) that are an enigma to me; the very 
sharp cut to the leaves, the great glandular-hairiness, the linear pods, 
and filiform pedicels almost tempt me to call it a new species It does 
not appear to be either incisum of Engelman or auriculatum or diffusum 
of Gray. 
Sisymprium incisum, Engelm. (Pl. Fend. p. 8). . (S. Californicum, Wat- 
son, in King’s Report )—Nevada and Utah. 
SisyMBriIuM virgatum, Nutt.—‘‘ 6-12’ high; stems simple or branched 
from the base (or sometimes branched above), slender, covered below with 
an ashy, simple, or forked pubescence; leaves tomentose pubescent; those 
of the root petioled, lanceolate-oblong, and sinuate-dentate; stem leaves 
sessile, lanceolate, auriculate, and clasping at base, entire, denticulate, or 
slightly wavy-margined, 6-8” long; flowers pale purple, 2’ in diameter ; 
stigma almost sessile; pods 1-14’ long, and 3-4 times exceeding the slender 
pedicels; seeds 4-angled, ‘in a double series.’” (605, 606, 652.) South 
Park and Twin Lakes, Colorado. 
SMELOWSKIA cALyciInA, Meyer—Alpine regions of Colorado. (601.) 
ERysIMUM CHEIRANTHOIDES, L—Twin Lakes, Colorado, 9,000 feet 
altitude. (651.) : 
Erysimum asperumM, DC.—Nevada and Utah. 
Erysimum AsperuM, DC., var. ArKansanum, Nutt—Central Colorado. 
(593, 596, 599, 640.) 
_Erysmmum asperum, DC., var. pummLum, Watson—Biue River. (594.) 
Erysimum WHEELERI, sp. nov.—3-—5° high, erect, unbranched, sparsely 
covered with closely appressed hairs, which are fixed by the middle 
(very rarely forked), never 4-parted; root-leaves, including petiole, into 
which they gradually taper, 2-4’ long, narrowly lance-linear, entire or 
sub-entire; stem-leaves narrowly lanceolate, sessile, 1-24’ long, entire ; 
pedicels (in fruit) 4-4’ long; mature pods erect, 1-2’ long (in younger 
pods there are distinct ribs between the angles), canescent; stigma two- 
lobed, style evident; seeds attached to each side of cell; cotyledons 
obliquely incumbent; petals varying from yellow to scarlet, twice as long 
as sepals, claw 4’ long, nearly filiform, lamina obovate, little over 4’ long. 
