(226) 



14. Cheiranthus L- Wall-flower. 



Lateral sepals saccate. Petals unguiculate. 

 Siliqua laterally compressed; replum broad; 

 valves 1-nerved. Seeds compressed, 1-seriate 

 in each valve. 



1. C. ASPER Cham. & Schlecht. Petals in 

 different localities of different coloration, viz., 

 near San Francisco cream-color, at San Mateo 

 orange-color, in Saucelito light yellow. — 0. 

 Common. SjDring. 



15. Streptanthus Nntt. 

 Sepals colored and equal. Petals undulate. 

 Siliqua laterally compressed; valves flattened, 

 1-nerved. Seeds oo, 1-seriate, marginate, com- 

 pressed. 



1. S. GLANDULOSUS Hook. Hispid; lat- 

 eral pair of sepals not turned inward behind 

 the upper petals; sepals and petals white or 

 red. — 0. Sunnyside. Spring. 



2. S. PERAMCENUS Greene. Hispid; lateral 

 pair of sepals turned inward behind the upper 

 petals; sepals dark purple, petals pale. — 0. 

 Wright's Station. Oakland Hills. Summer. 



3. S. NIGER Greene. Glabrous, glaucous; 

 sepals obtuse, dark purple; petals pale with 

 purple claws. — 0. Tiburon. Spring. 



16. Arabis L. Eock-cress. 



Petals not undulate. Siliqua laterally com- 



