34 



carpa. My specimens, which have the fruit most characteristic of 

 streptocarpa, are in other respects most like (generally including the 

 length of style also) axirea. I must, however, say that the fruit is in 

 no instance so much twisted as in the original specimens on which 

 streptocarpa was founded. That differences sufficient to constitute 

 distinct species exist between the extreme forms no one will probably 

 deny. It is equally certain that they both shade into one another 

 until at times all tests are doubtful and justify a place under either 

 name. These species furnish a ^^reductio ad afisMrdwrn " to the idea 

 that extreme forms so connected must be considered as one species. 

 In this instance I have named as streptocarpa all specimens having 

 leaves "beset and especially ciliate, with long and rigid, shaggy, 

 spreading, simple or simply forked hairs, far more bristly than iu D. 

 anrea, and with no fine stellular pubescence intermijed."'^ I rely more 

 on this character in deciding between interloping specimens than on 

 any other. 



D. KEMOKOSA, L. Stems leafy; pedicels about as long as the silicles, 



which are pubescent on their edges, becoming, however, glabrous with 



age. My specimens have the flowers bright yellow on opening, and a 



clear white when a day older, before even they begin to wither. (637.) 



D. ne:mokosa, L., var. lutea. Gray. Georgetown. June. (628.) 



D. NEJioEOSA, L., var. CRAssrroLiA, S. Wats. Open wood>^. 10-11,000 



feet. (036.) (635 is a still more reduced form from still greater alti- 

 tudes.) Some extreme forms to me look quite near B. CaroUniana, 

 Walt., var. micrantha, Gray, to which 1 apprehend they will yet be 

 removed. 



D. IKCANA, L., var. conpusa. Hook. Plant agrees with authentic her- 

 barium specimens bearing the above label. (Number mislaid ) 



Sisymbrium canescens, IS'utt. One form of which exactly resembles, 

 so far as I can determine in the absence of fruit, the var. r of T & G 

 (598, 611, 012, 614.) 



Smelowskia calycina, Meyer. Alpine in Central Colorado. (601 ) 

 Erysimum CHEiKANTHOiDEs, L. Twin Lakes; altitude, 9,400 feet. Jul v. 



(051.) '' 



E. ASPEEUM, DC;, var. ARKA^fSANUM, mitt. Ki„ Carson, Clear Creek, 

 South Tark. (593, 50G, 599, 640.) • ' 



E. ASPERUM, DC, var, pumilUxM, Watson. Blue River. (594.) 



E. yiRGATUM, Giay. {Sisymbrium virgatum, Nntt.) South Park, Clear 

 Creek. (605, (>m.) ' 



Theltpodium integrifolium, Endl. Dwarfed specimens. South 

 Park. August. (645.) 



CamelIxNA sativa, Crantz. Apex, Introduced. (604.) 

 Lepidium INTER3IEDIUM, Gray. Si)ecimeo8 too young. (597 ) 

 L. ALYSsoiDES, Gray. South Park, San Luis Valley. (02 ! ) 



L. moktanum, 2^"utt. San Luis Valley. Fruit and^flowers iu Septem- 

 ber. (624.) ^ 



Tiilaspi alpestee, L. Clear Creek, and common in alpine and sub- 

 alpine regions of Central Colorado, I have no means of comparing 

 It with the Enropeau specimens, but accept Mr. Watson's conclusion 

 lu regard to it. Certainly it is very variable. (607.) 



OAPPARIDACEiE. 



^^^?^^^ INTEGEIFOLIA, T. & G. Dry plains. August to September. 



(ioO,) ■ 



C. Sondes, Gray. San Luis Yalley. (761.) 



■T 

 ^i 



