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14. Cheiranthus L. Wa.t-riower. 
Lateral sepals saccate. Petals unguiculate. 
Siliqua laterally compressed; replum broad; 
valves 1-nerved. Seeds compressed, 1-seriate 
in each valve. 
1. ©. aspen Cham. & Schlecht. Petals -in 
different localities of different coloration, viz. , 
near San Francisco cream-color, at San Mateo 
orange-color, in Saucelito light yellow.—©o, 
Common. Spring. 
15, Streptanthus Nutt. 
Sepals colored and equal. Petals undulate. 
Siliqua laterally compressed; valves flattened, 
I-nerved. Seeds o, 1-seriate, marginate, com- 
pressed. 
1. §. GLANDULOsus Hook. Hispid; lat- 
eral pair of sepals not turned inward behind 
the upper petals; sepals and petals white or 
red.—@. Sunnyside. Spring. 
2. §. PERAM@NUS Greene. Hispid; lateral 
pair of sepals turned inward behind the upper 
petals; sepals dark purple, petals pale.—©. 
Wright’s Station. Oakland Hills. Summer. 
3. §. NIGER Greene. Glabrous, glaucous; 
sepals obtuse, dark purple; petals pale with 
purple claws.—@©. Tiburon. Spring. 
16. Arabis L. Rocx-cruss. 
Petals not undulate. Siliqua laterally com- 
