485 
Erysimum asperum (Nutt.) DC. Syst. ii, 505 (1821); Cheiranthus asper Nutt. 
Gen. ii, 69 (1818). 
Hot Springs, altitude 1,050 m., June 14; Hermosa, altitude 1,000 m., June 23; 
Rapid City, altitude 1,000 m., June 26 (No. 522). 
A form with slender, twisted pods was collected on the hills north of Deadwood, 
altitude 1,500 m., July 5 (No. 523). 
Erysimum cheiranthoides L. Sp. Pl. ii, 661 (1753). 
Hot Springs, altitude 1,050 m., June 14; Rochford, altitude 1,050 m., July 11 (No. 
524). 
Erysimum inconspicuum (Wats.) MacMillan, Metasp, Minn. Val. 268 (1892) ; 
Erysimum asperum inconspicuum Wats. Bot. King Sury. 24 (1871). 
This resembles very much F. virgatum Roth of Europe, and perhaps is only its 
American form. It was growing together with /. asperum and £. cheiranthoides, and 
in the field it seemed as if possibly it might be a hybrid of the two, In pubescence, 
color, and form of the flowers, and form of the pod it is more like /. asperum; the 
general habit is that of FL. cheiranthoides, and the size of the flowers intermediate 
between those of the two. 
Hot Springs, altitude 1,050 m., June 13 (No. 525). 
Sisymbrium pinnatum ( Walt.) Greene, Bull. Cal. Acad. ii, 390 (1887); Hrysimum 
pinnatum Walt. Fl. Car. 174 (1788). 
This is very variable. Some specimens are more or less canescent and have the 
seeds plainly in two rows (No. 526); others are smooth or, on the upper parts, 
glandular and have the seeds apparently in one row, characters that should belong 
to S. incisum Engelm. (No, 527). ‘The two were growing together at Hot Srpings, 
altitude 1,075 m., June L. 
Brassica alba (L.) Boiss. Voy. Espagne, ii, 259 (1839-45); Sinapis alba L. Sp. PI. ii, 
668 (1753). 
Railroad embankment, Buffalo Gap, altitude 991 m., June 21 (No, 529). 
Brassica sinapistrum Boiss. Voy. Espagne, ii, 39 (1839-45). 
Buffalo Gap, altitude 991 m., June 21 (No, 528). 
Roripa palustris (L.) Bess. Enum. 27 (1821) ; Sisymbrium amphibium palustre L. Sp. 
Pl. ii, 657 (1753). 
Rare in the region: Rapid City, altitude 1,000 m., June 26 (No, 530). 
Roripa nasturtium (L.) Rusby, Mem. Torr. Club, iii, 5 (1898); Sisymbrium nas- 
turtium L. Sp. Pl. ii, 657 (1753). 
Fall River, near the Chautauqua grounds, above Hot Springs, altitude 1,050 m., 
June 14 (No. 531). 
A form, very low, creeping, extensively rooting, with very fleshy leaves of 0 to 2 
small pairs of leaflets and a larger, nearly orbicular, odd leaflet, and with short and 
thick pods, was growing in the warm springs, at Hot Springs, altitude 1,050 m., June 
14 (No. 532). 
Lesquerella argentea arenosa (Richards.) Wats. Proc. Amer. Acad. xxili, 252 
(1888) ; Vesicaria arenosa Richards. Bot. App. 743 (1823). ; 
There are no specimens of this variety in the National Herbarium, but I think it 
is this plant (which is illustrated by specimens in the Harvard Herbarium) that 
Dr. Watson had in view in his revision. The form of the leaves does not agree fully 
with the original description in the Appendix to Franklin’s Journal, being narrower 
and with entire margin. The figure of I’. arctica in Curtis's Botanical Magazine,! 
which, according to Watson, is the same as I’, arenosa Richards., is drawn from a 
young specimen, but resembles this much, although it seems to be a little stouter. 
My plant is densely stellate-pubescent, much branched from the perennial caudex ; 
radical leaves broadly spatulate or oblanceolate, often a little acutish; stem 1.5 dm. 
1 Bot. Mag., lvi, t. 2882. 
