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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 léaf-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, flattish, in one row in each cell. 
es This has small flowers, but often grows 
ely podium : ai 
OC haratnen in such 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 
es Oe: 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. 
Say ae This is a rather pretty plant, a foot or 
Arabis Féndlerr ™ore tall, with more or less hairy stems 
Magenta and leaves and pretty clusters of magenta 
Spring flowers, each about a quarter of an inch 
Arizona 
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 
ay Wall- handsome flowers is exceedingly effective 
ees ues among the dark tree-trunks of the moun- 
Gsperum tain forests where they often grow. They 
Orange,lemon- are widely distributed as far east as Ohio. 
Ne ed The stout, purplish stems are from one to 
Spring, summer 
Wiest cic. two feet 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. 
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