DICOTYLEDONOUS PLANTS 71 



XII. DENTA'RIA, Toothwort, Pepper-root 



Pods linear, flattened parallel with the partition, walls 

 firm without nerves, stigma short. Seeds in 1 row, wingless. 

 Flowers large, pale rose-color or milky white. 



D. Califor'nica Nutt. MILKMAIDS. Rootstocks bearing tubers 

 which easily break off. Root leaves simple and round-kidney-shaped 

 or with 3 leaflets (usually not found on the blooming plant) ; stem 

 leaves with from 3 to 5 pinnate leaflets on petioles. This is one of 

 the loveliest and most common of the early spring flowers, usually 

 found in damp places. Widely distributed in the Coast Mountains. 



XIII. CARDA'MINE 



Pods linear, flat, with the seeds in 1 row, wingless. This 

 is similar to Dentaria, but has smaller floiuers, narrower pods, 

 and smaller seeds. The chief differences lie in the cotyledons, 

 which in Cardamine are flattened, while in Dentaria they are 

 thick, unequal, and oblique. 



C. oligosper'ma Nutt. Annual, slender, hairy or smooth. Leaves 

 pinnately divided, with small 3-5 lobed or toothed divisions which 

 are on small petioles. Flowers small, \ in. long, white, in few- 

 no wered racemes, on short peduncles. Pods erect, on short stipes 

 and containing 8-20 seeds. This grows in shady, damp places ; it 

 blooms in the spring and is widely distributed along the Pacific 

 Coast. 



XIV. AR'ABIS, Rock-cress 



This is similar to the preceding, except that the walls of the 

 jxx/x are nerved, roots woody, and seeds usually with a border 

 or wing. Flowers white or rose-color, often conspicuous. 



. A. perfolia'ta Lam. TOWER MUSTARD. Biennial herbs with 

 stems bluish green, erect, 1 or 2 ft. high. Stem leaves arrow-shaped 

 and clasping. Root leaves hairy, soon withering. Flowers small, 

 white. Pods numerous, slender, erect, parallel, and close to the stem. 

 Seeds generally narrowly winged. Widely distributed. 



b. A. blepharophyl'la Hook. & Arn. Stems low, from a tuft of 

 broadly spatulate, dark-green leaves, with long hairs on the margins. 

 Flowers large, fragrant, reddish purple. Pods beaked, flat, loosely 

 spreading. Seeds with a narrow wing, in 1 row. This is perennial and 

 is found on rocky hills near the coast from San Francisco to Monterey. 



