SUPPLEiVIENT.— CRUCIFER E. 6( 7 



California, Douglas. — Plant 1-2 feet high. Petals about lialf as long 

 again as the calyx. Hovk. ^- Am. 



6. ARABIS, 2). 79-83. 



1 (fl). A. hU phnrophyUa (Honk. cV Arn.) : jifronnial ; leaves naked, ex- 

 cept the niargiiis, wiiich are ciliate witii very rigid simple or forked white 

 hairs; the radical ones ohovate-spaiulate, the caiiline oblong and sessile; 

 sepals elliptical, obtuse, pubescent above with stellate liairs ; petals (purple) 

 obovate, with slender claws. Hook. S^' Arn. ! hot. Becclinj, suppl. p. 321. 



California, Duitnlas ! [probably from the interior.] — Stem 3—4 inches 

 high. Calyx half the length of tlic petals. — A very distinct species. 



14. A. laevigata 0. laciniata. — Kentucky, Dr. Peter! Dr. Short.' 



7. CARDAMINE, ]). 83-86. 



1. C. rhomboidea y. — Louisiana, Prof. Carpenter ! 



4. C. purpurea (Cham. & Schlechf. !) — We have this fine species from 

 Douglas's collection, (communicated by Mr. Bcnthaiii) probably from the 

 interior of Oregon, but the locality is not recorded. The leaflets of the 

 radical leaves are all obtuse, as indeed they are described by Chainisso and 

 Schlechtendal, but some of them are acute at the base. 



10. PHCENICAULIS, p. 89. 



P. cheiranthoides. — Add syu. Hespcris Menziesii, Hook. fl. Bor.-Am. 1. 

 p. 60, ty hot. Beechey, suppl. p. 322, t. lb. California, Menzies ! Pine 

 Creek, in the Snake Country, Mr. Tolmiel 



12. HESPERIS, p. 90. 



2. H. minima is Cheiranthus Pallasii, Pursh .', and must be called H. 

 Paiasii. — (Vid. notes upon Cheiranthus.) 



3. H. Menziesii is Phcenicaulis cheiranthoides, Nutt. 



13. SISYMBRIUM, p. 91-93. 



3. S. linifolium. — Add syn. Erj-simum ? glaberrimum, Hook. Sf Am. ! 

 hot. Beechey, suppl. p. 323. (Snake Country, Mr. Tolmie.) Flowers pale 



yellow. 



4. S. pygmaum (Nutt.) is only a dwarf form of tlie preceding. 

 8. jS. humile. — Add syn. Ledeb. ic. pi. Ross.-Alt. t. 147. 



15. ERYSIMUM, 2?. 94. 



3. E. asperum. — Add syn. Hook. Sf Arn. ! hot. Beechey, suppl. p. 323. 

 E. elatum, Nutt. no. 5. (certe.) — Interior of California, Douglas I Mr. 

 Tolmie ! 



4. E. Arkansanum. — Rocky banks of the Scioto, near Columbus, Ohio, 

 Mr. Sullivant I 



8. E. grandiflorum. — Add syn. Cheiranthus asper, Cham. S; Schlecht. ! 



