4 FLOWERS OF FIELD. HILL, AND SIVAMP 



3. Worm-seed Mustard 



Erysimum cheirantholdes. — Family, Mustard. Colo/; yel- 

 low. Leaves, alternate, entire, lance- shaped. No stipules. 

 Time, July. 



The mustard family is composed of herbs, with a pungent, 

 watery, never poisonous juice ; flower sepals and petals in 

 fours, the latter equal and spreading; stamens, 6, 2 being 

 shorter than the other 4. Stigmas, 2. Pod, two-celled ; when 

 long, narrow, and roundish, called a siliqiie, and when very 

 short, a silicic. Flowers in terminal racemes. The leaves are 

 simple, opposite or alternate, in many species much dissected. 



The cabbage, cauliflower, turnip, and horse-radish belong to 

 this family. Many of the species are originally from Europe, 

 and have become common weeds with us. 



This species has a four-sided, short pod, with a mid-rib on each 

 of its four valves. Flowers small, on slender, diverging stems. 

 Minute, split hairs, as seen through the microscope, cover the 

 plant and give it a roughish appearance, i to 2 feet high. 



4. Cut-leaved Toothwort 



Dentaria faciniafa. — Family, Mustard. Color, pale purple 

 or nearly white. Leaves, in 2 or 3 whorls, on the stem, 3 in 

 each whorl, long-petioled, each leaf 3-parted, into linear or 

 lance-shaped leaflets, which are irregularly and deeply toothed. 

 Similar root leaves, or none. Time, April, May, as early as 

 March in the South. 10 to 15 inches high. 



A short raceme of flowers terminates the unbranched stem. 

 A pretty species, with graceful foliage, found from New England 

 to Minnesota and southward. 



5. Great St.-John's-wort 



Hypericum Ascyron. — Family, St.-John's-wort. Color, yel- 

 low. Leaves, opposite, dotted, 3 to 5 inches long, clasping or 

 sessile, lime, July. Height, 2 to 5 feet. 



