485 



Erysimum asperimi (Nutt.) DC. Syst. ii, 505 (1821); Cheiranthus usptr Nutt. 

 Gen.ii, 69 (1818). 



Hot Springs, altitude l,Or)0 m., Juno 14; Hermosa, altitude 1,0U0 m., June 23; 

 Rapid City, altitude 1,000 m., Juno 26 (No. 522). 



A form with slender, twisted pods was collected on the hills north of 1 )ead\vood, 

 altitude 1,500 m., July 5 (No. 523). 



Erysimum cheirauthoides L. 8p. PI. ii, 661 (1753). 



Hut Springs, altitude 1,050 m., June 14; Rochford. altitude 1,050 in., July 11 (No. 

 524). 



Erysimum inconspicuum (Wats,) MacMillau, Metasp. Minn. Val. 268 (1892); 

 Jirysimum asperum inconspicuum Wats. Hot. King Surv. 24 (1871). 



This resemhles very much E. vi)(jatu7n Roth of Europe, and perhaps is only its 

 American form. It was growing together Avith /:,'. asperum and E. cheirantholdcs, and 

 in the field it seemed as if possibly it might he a hybrid of the two. In jiubescence, 

 color, and form of the llowers, and fonu of the pod it is more likfe E. asperum: tlie 

 general habit is that of E. cheiranthoidcs, and the size of the flowers intermediate 

 between those of the two. 



Hot Springs, altitude 1,050 m., June 13 (No. 525). 



Sisymbrium pinuatum (Walt.) Greene, Bull. Cal. Acad, ii, 390 (1887); Erysimum 

 pinuatum 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 14. 



Brassica alba (L.) lioiss. Voy. Espagne, ii, 239 (1839-45) ; Sinupis alba L. Sp. PI. ii, 

 668 (1753). 

 Railroad embankment, Buffalo Gap, altitude 991 ni., June 21 (No. 529). 

 Brassica sinapistrum Boiss. Yoy. Espagne, ii, 39 (1839-45). 

 Buffalo Gap, altitude 991 m.. June 21 (No. 528). 



Roripa palustris (L.) Bess. Enum. 27 (1821) ; Sisymbriuin amphibium 2)alustr€ L. Sp. 

 PI. ii, 657 (17.53). 

 Rare in the region : Rapid City, altitude 1,000 ni., June 26 (No. 530). 



Roripa nasturtium (L.j Rushy, Mem. Torr. Club, iii, 5 (1893); Sisymbrium nas- 

 turtium L. Sp. PI. ii, 657 (1753). 



Fall River, near the Chautamiua grounds, above Hot Springs, altitude 1,050 m., 

 June 14 (No. 531). 



A fonu, very low, creeping, extensively rooting, with very fleshy leaves of 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, xxiii, 252 

 (1888); I'eaicaria arenosa Richards. Bot. Apj). 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 Ilerbariuiu) 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 T. arctica in Curtis's Botanical Magazine,' 

 which, according to Watson, is the same as V, arenosa Richards., is drawn irom a 

 young specimen, biit resembles this much, although it seems to bo a little stouter 



My plant is densely stellate-pubescent, much branched from the perennial ('andcx; 

 radical leaves broadly spatulate or oblanceolate, often a little acutish; stem 1.5 dm. 



'Bot. Mag., Ivi, t. 2882. 



