LEG U MINOS /I-:, 119 



B. dlversilaba T. & Q. Fl. i, 218. ( Poison Oak). Stems erect and 

 shrubby or climbing by rootlets attached to the barU of trees; 2—20 

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

 5-f oltolate; leaflets ovate, obovate or elliptieal, 1—3 inches long, obtuse 

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

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

 2—3 lines in diameter, falling soon after maturing. In fonests 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 2—5 feet high, dif- 

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

 leaves trifoliolate: leaflets sessile, cuneate-obovate or rhomboidal, 1—2 

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

 obtuse: -spikes of small yellowish flowers 4^-6 lines long, approximate 

 at the end.s of the branchlets: fruit somewhat viscid, 2—3 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. LEGUMINOS^ Bojrh. 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 u:iiequal 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- 

 phbus (9 and 1) or monadelphous, sometimes distinct or num- 

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

 rarely two or more, free from the( calyx, the style protruding 

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

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

 solitary or several, heterotropous or anatiopous, 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/j: 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 cotyledon^, 

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

 ally perfect. 



Tribe i. Podalyrie^. Herbaceous or sufFrutescent plants with 

 palmate, or pinnate or sirnple leaves and papilionaceous flowers. 

 Stamens 10, distinct ; anthers uniform. Embryo incurved or 

 inflexed, or ofteri straight. 

 1. Tliermopsis. Herbs with conspicuous stipules, a,igitately trifoliolate 



