MUSTARD FAMILY. Cruciferae. 



There are a good many kinds of Thelypodium, natives 

 of North America, all western or southwestern; mostly 

 smooth plants, the leaves usually with leaf-stalks, the 

 flowers in clusters; stamens long, conspicuous, with very 

 narrow, arrow-shaped anthers; pods long, cylindrical or 

 four-sided, often twisted, sometimes on a slender stalk; 

 seeds oblong, flatiish, in one row in each cell. 



This has small flowers, but often grows 



Thelypodium . on. 



toruldsum m suc " quantities on the flats near Salt 



Lilac Lake that it tints the fields with purple. 



Spring, summer The purplish stem is from twelve to fifteen 

 West, etc. inches tall and the leaves are light bluish- 



green and very smooth, the root-leaves with long leaf- 

 stalks, and the stem-leaves arrow-shaped and clasping at 

 base. The flowers are about half an inch across, with a 

 purplish-tinged calyx and pale pinkish-lilac petals, and form 

 flat-topped clusters. The pods are spreading and rather 

 knobby. This usually grows on dry hills, reaching an al- 

 titude of over nine thousand feet, as far east as Wyoming. 

 There are many kinds of Arabis, widely distributed, 

 with small, white or purplish flowers. 



_ Jt , . This is a rather pretty plant, a foot or 



Fendler's Arabis , . 



Arabis Fcndlen more tall Wlt ^ more or less h airv Stems 



Magenta and leaves and pretty clusters of magenta 



Spring flowers, each about a quarter of an inch 



Anzona across. It grows on the rim of the Grand 



Canyon. 



There are many kinds of Erysimum, most abundant in 

 Europe and Asia. They are usually biennial or perennial, 

 more or less downy; mostly with yellow flowers; the pods 

 long, narrow and squarish or flattish, rarely round, with 

 numerous seeds, in one row. In Europe these plants often 

 grow in the crannies of old walls, hence the common name. 

 The vivid glowing orange of these 

 fllwer" 1 Wal1 " handsome flowers is exceedingly effective 

 Erysimum among the dark tree-trunks of the moun- 



asperum tain forests where they often grow. They 



Orange, lemon- are widely distributed as far east as Ohio. 

 ye ow /Pj^ stout p ur pii s h stems are from one to 



Spring, summer 



West, etc. two - eet tall and the long, narrow leaves, 



often toothed, are apt to be purplish on 



the under side, and both stem and leaves are rather rough. 



