64 BOTANY. 



Sisymbrium caebscens, Nutt — Colorado and Nevada From Ash 

 < 'ic.k, Arizona, I have specimens (306) that are an enigma to me ; the very 

 sharp cut to the loaves, the great glandular-hairiness, the linear pods, 

 and filiform pedicels almosi tempi me t.» call it a new species It does 

 not appear to lie cither incisum of Engelman or a/uriculatum or diffwtm 

 of ( . r.i \ . 



Sisymbrium incisum, Engelm. (PL Fend p. 8). (fi. Californicum, Wat 

 son, in Bang's Report) — Nevada and Utah. 



Sisymbrium 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 1-1 i' long, and 3-4 times exceeding the slender 

 pedicels; seeds 4-angled, 'in a double series.'" (G05, 606, 652.) South 

 Park and Twin Lakes, Colorado. 



Smelowskia calycina, Meyer. — Alpine regions of Colorado. (601.) 



Erysimum ciieiuantiioides, L. — Twin Lakes, Colorado, 9,00<» feet 

 altitude. (651.) 



Erysimum asperum, DC. — Nevada and Utah. 



Erysimum asperum, DC, var. Aukansanum, Nutt. — Central Colorado. 

 (593, 596, 599, 640.) 



Erysimum asperum, DC., var. pumilum, Watson. — Bine River. (594. 



Erysimum Wheeleri, sj). 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, 1-2.V long, entire; 

 pedicels (in fruit) \-V long; mature pods erect, 1-2' long (in younger 

 pods there are distinct ribs between the angles), canescent : stigma two 

 lobed, style evident: Beeds attached t<> each side of cell; cotyledons 

 obliquely incumbent ; petals varying from yellow to scarlet, twice as long 



pals, (daw h' long, nearly filiform, lamina obovate, little over \ Long 



