54 



PHANEROGAMIA. 



lines long, obovate-oblong, obtuse. Peduncles scapiform, leafless, from 

 one to 3 inches long. Raceme in flower dense and subcorymbose, in 

 fruit more or less elongated, with the lower pedicels rather distant, 

 but the upper corymbose-crowded. Flowers nearly 2 lines long: 

 petals white. Pedicels spreading, a line or two in length. Silicles 

 mostly 3 lines long and a line wide, pubescent with short and close 

 hairs, sometimes almost as canescent as the leaves, even when 

 mature ; while in the varieties characterized above, this pubescence 

 is sparser and more or less deciduous : their form varies from ellip- 

 tical-oblong to oblong-linear; the valves nearly flat. Style very short, 

 but distinct. Seeds 10 to 15 in each cell. 



A rather variable species, allied to D. Macleani, into which some of 

 the forms may possibly pass, notwithstanding their narrow and pubes- 

 cent pods. 



4. Drab A Pickeringii, Sp. Nov. 



D. tomentoso-canescens ; caulibus e radice perenni divisis abbreviate; 

 foliis confertis obovatis obtusis; pedunculis elongatis nudis vel oligo- 

 pliyllis; racemo densifloro; floribus majusculis sublonge pedicellatis 

 albis; pedicellis calyceque villosis; siliculis ovali-ellipticis incano- 

 pubescentibus stylo longiusculo abrupte superatis; valvis planis. 



Hab. Between Culnai and Obrajillo, high Andes of Peru. 



Plant canescent with a close stellate tomentum, and with hirsute or 

 villous hairs. Sterns clustered from a perennial root, an inch long : the 

 leaves crowded, spreading, obovate, obtuse, 4 to 6 lines long, often one or 

 two oblong ones cm the peduncle, or at the base of the raceme. Peduncle 

 2 or 3 inches long. Raceme densely-flowered, an inch long; the 

 pedicels from 3 to 5 lines long, all approximated, or two or three of 

 the lower ones distant, villous, as also is the calyx. Flowers rather 

 larger than in the preceding species: petals white. Silicles oval or 

 broadly elliptical, very obtuse, about 3 lines long and 2 lines wide, 

 canescently pubescent, abruptly tipped with a conspicuous style of about 

 half a line in length; the valves flat, very thin. Seeds 10 to 16 in 

 each cell. 



