8 SYNOPSIS OP THE FLORA OF COLORADO. 



from D. aurea, which it most resembles, by its lack of stellular pube- 

 scence, longer styles and the more twisted silicles. In the mountains 

 from 7-14,000 feet altitude. Alpine forms much dwarfed. Hall & Har- 

 bour,^; Parry, Canby; Brandegee ; Coulter. 



DRABA CRASSIFOLIA, Grah. Scape naked or with a single leaf, l'-3' 

 high ; leaves lanceolate-linear, entire or somewhat serrate, ciliate with 

 simple hairs ; calyx and pedicels glabrous; flowers small, yellow or white ; 

 petals a little exceeding the calyx, retuse; silicles ovate-elliptical, glab- 

 rous. Hall & Harbour, 41. Sangre de Cristo Pass, Brandegee. 



DRABA NEMOROSA, L., var. LUTEA, Gr. (D. lutea, DC.) ' Pubescent ; 

 stem branching, leafy, 6'-15' high, very slender, sometimes branching 

 from the base ; pubescence simple or forked ; leaves oval, cauline ones 

 lanceolate, toothed; flowers very small, yellow; petals about twice as 

 long as the calyx; style none; silicles oblong-elliptical, rather obtuse, 

 glabrous, about 4" long, one-third to one-half the length of the slender 

 spreading pedicels. Alpine and subalpiue. Hall & Harbour , 42. Sierra 

 Madre Range at 11-13,000 feet altitude, Coulter. 



Var. ALPINA, Porter. Dwarf, 2'-3' high, branching from the base ; 

 fruiting raceme short; flowers white; pedicels shorter than the silicles; 

 stigmas distinctly 2-lobed. Mount Lincoln, at 13,000 feet altitude, July, 

 Coulter. 



DRABA CUNEIFOLIA, Nutt. Canon City, Brandegee. 



SISYMBBIUM CAKESCENS, Nutt. Very variable in the division of the 

 leaves and the amount of pubescence, the latter always branched. Very 

 common on the plains and in the mountains at all heights. Hall <fc 

 Harbour, 40; Dr. Smith; Meehan; Porter; Brandegee; Coulter. 



SISYMBRIUM GLAUCUM, Kutt. Annual, glaucous, about 1 high, 

 much branched, leaves entire, radical ones small, spatulate, cauline 

 ovate, sagittate and clasping, rather acute; flowers minute, pale pur pie ; 

 petals cuneate-oblong, twice as long as the sepals ; silicles ' long, gla- 

 brous; style almost none; seeds in a single or partly in a double series: 

 cotyledons decidedly incumbent. 



South Park, July, 1872, Porter. A slender dwarf- form, 3'-4' in height, 

 with smaller leaves and shorter siliques. 



SMELOWSKIA 1 CAL.YCINA, Meyer. (Hutchinsia, Desv.) Leaves mostly 

 radical on long petioles, deeply pinnatifid; flowers white, in dense 

 corymbs, the limb of the petal roundish; calyx persistent; stem 4'-6' 

 high, elongating in fruit. Alpine and subalpiue. Hall & Harbour, 43. 

 Mount Lincoln at 1,300 feet altitude, July, Coulter. 



ERYSIMUM CHEIRANTHOIDES, I^.Hall & Harbour, 38. Twin Lakes 

 at 9,000 feet altitude, Porter. 



ERYSIMUM ASPERUM, DC., var. ARKANSANUM, Nutt. Variable and 

 abundant on the plains and mountains. Hall & Harbour, 39; Dr. 

 Smith; Porter; Coulter. 



Var. PUMILUM, Watson. King's Rep., vol. 5, p. 24. (E. pumilum, 

 ]N~utt.) Somewhat scabrous, stems 2'-4' high; leaves linear, all entire; 

 flowers pale yellow, conspicuous; petals longer than the calyx; stigma 

 small, nearly entire; pedicels very short; siliques flatly 4-sided, 3' long, 

 erect. Hall & Harbour, 39. Alpine; 



1 SMELOWSKIA, C. A. Meyer. Sepals short, equal; silicle rather short, narrowed at 

 each end, somewhat tetragonal or laterally compressed; valves concave, submembru- 

 nous, with included filiform replum and membranous septum; style short and stigma 

 simple. Seeds few in one row, immarginate, funiculus setaceous, free; cotyledons in- 

 cumbent. Perennial hoary, toinentose subca'spitose herbs, with 1-2 piiiuatinxL leaves 

 and bractless flowers. Benth. and Hook* 



