DICOTYLEDONOUS PLANTS 89 



P. rivula'ris Dougl. Tree 15-25 ft. high. Leaves simple, ovate- 

 lanceolate, acute or pointed, 1-3 in. long, sometimes lobed or with 

 sharp teeth on the margins. Corymb somewhat like a raceme. 

 Pedicels slender, 1 in. long. Petals orbicular, white, ^ in. long. 

 Fruit reddish or yellowish, ^ in. long. This is found from northern 

 California to Washington. 



V. SOR'BUS, Mountain Ash, Rowan 



Shrubs or trees. Leaves large, pinnately compound, with 

 oblong, serrate leaflets. Flowers small, white, in terminal, 

 compound cymes. Styles distinct, as many as the cells of 

 the ovary. Fruit about the size of a pea, red when ripe, 

 usually containing one seed. 



S. occidentals Greene. Shrub 2-6 ft. high, smooth. Leaflets 

 3-5 pairs. Cyme small, with few flowers. Fruit pear-shaped. 

 This grows in the Sierra Nevada Mountains, chiefly northward. 



LEGUMJNO'S^. PULSE FAMILY 



Ovary 1-celled ; fruit a legume (/. Fig. 271, II ; e. Fig. 176). 

 Leaves alternate, compound, with stipules (with a few excep- 

 tions). There are three subdivisions, of which two are well 

 represented in California. 



SUBORDER I. PAPILIONACE^, PEA FAMILY 



Calyx of 5 sepals, more or less united, often somewhat 

 irregular. Corolla of 5 petals, papilionaceous (/. Fig. 141; 

 e. Fig. 119). Stamens 10, either monadelphous, diadelphous, 

 or distinct. Seeds 1 or several, without endosperm. 



I. THERMOP'SIS, Golden Pea 



Herb with spreading underground stems. Leaflets 3, 

 palmate, with stipules almost as large. Flowers large, yel- 

 ltr, in terminal many-flowered racemes on short pedicels 

 with bracts. Stamens distinct from each other. Legumes 

 linear, compressed. 



