LEG U MINOS IE. 119 



R. diversiloba T. & G. Fl. i, 218. ( POISON OAK). Stems erect and 

 shrubby or climbing by rootlets attached to the bark of trees; 220 

 feet high, usually somewhat pubescent: leaves usually 3-foliolate rarely 

 5-foliolate; leaflets ovate, obovate or elliptical, 13 inches long, obtuse 

 or acutish, 3-lobed or coarsely toothed, (rarely entire), the lobes and 

 teeth rounded: panicles peduncled: flowers dioecious: fruit white, 

 23 lines in diameter, falling soon after maturing. In forests and 

 rocky hillsides, Brit. Columbia to California. 



* * I . owers polygamo-dioecious, in short scaly-bracted spikes 



preceding the leaves. 



R. trilobata Nutt. T. & G. Fl. i, 219. A shrub 25 feet high, dif- 

 fusely branched, more or less pubescent, at length nearly glabrous: 

 leaves trifoliolate: leaflets sessile, cuneate-obovate or rhomboidal, 12 

 inches long, coarsely toothed above and often 3-lobed, the segments 

 obtuse: spikes of small yellowish flowers 46 lines long, approximate 

 at the ends of the branchlets: fruit somewhat viscid, 23 lines in 

 diameter, globose, bright red; nut smooth. On gravelly plains and 

 hillsides, along streams, southern Oregon to California and the Rocky 

 Mountains. 



ORDER XXVI. LEGUMIXOS^E Bcerh. Hor. Acad. ii. 22. 



Herbs shrubs or trees with alternate usually compound 

 stipulate leaves, and usually showy flowers in axillary or termin- 

 al racemes or spikes, rarely solitary or capitate. Sepals united 

 into a 5-cleft or 5-toothed calvx, the lobes often unequal or 

 variously combined, the odd one inferior. Petals 5, sometimes 

 by abortion fewer or wanting, perigynous or hypogynous, ir- 

 regular and unequal, or sometimes regular, distinct or various- 

 ly cohering, the odd one superior. Stamens mostly 10, diadel- 

 phous (9 and I) or monadelphous, sometimes distinct or num- 

 erous, inserted with the petals. Ovary simple, solitary, very 

 rarely two or more, free from the calvx, the style prolruding 

 from the upper or ventral suture: stigma simple. Fruit, a 1- 

 celled 2-valved pod (legume), or sometimes a drupe. Seeds 

 solitary or several, heterotropous or anatropous, sometimes 

 with an aril or large caruncle: albumen none. Embryo straight 

 or with the radicle bent back along the edge of the cotyledons. 

 Cotyledons thin and somewhat foliaceous, or thick and fleshy. 



Ours are all of 



SUBORDER PAPILIONACE^; L. Sepals imbricate or rarely 

 somewhat valvate in the bud. Corolla papilionaceous or other- 

 wise more or less irregular, rarely wanting Stamens 10, rarely 

 fewer, inserted with the petals into the bottom of the calyx, or 

 perigynous. Radicle bent back upon the edge of the cotyledons, 

 or straight. Leaves simple or simply compound. Flowers usu- 

 ally perfect. 



TRIBE i. PODALYRIE^E. Herbaceous or suffrutescent plants with 

 palmate, or pinnate or simple leaves and papilionaceous flowers. 

 Stamens 10, distinct ; anthers uniform. Embryo incurved or 

 inflexed, or often straight. 



1. Thermopsis. Herbs with conspicuous stipules, digitately trifoliolate 



