Thermopsis. LEGUMINOS^E. \\§ 



Suborder II. C.ESALPIXE.E. 



Flower more or less irregular. Perigynous disk lining the tube or base of the 

 calyx. Petals imbricated in the bud, the superior one (answering to the standard) 

 within the lateral ones. Stamens 10 or fewer, distinct. Seeds sometimes with 

 albumen. Radicle not incurved. 



* Corolla seemingly papilionaceous. 



17. Cercis. Trees or shrubs, with simple rounded leaves, and lateral fascicles of rose-purple 



flowers. Calyx barely 5-toothed. 



* * Corolla not at all papilionaceous, yellow. Calyx 5-parted. Seeds with albuinen. 



18. Cassia. Herbs or sometimes shrubs, with simply and abruptly pinnate leaves. Anthers 



fixed by the base, mostly opening by terminal pores, either 10 and unequal or some of 

 the upper ones imperfect, abortive, or wanting. Calyx imbricated in the bud. 



19. Parkinsonia. Somewhat spinescent shrubs or trees, with twice pinnate (or apparently only 



pinnate) leaves : leaflets small. Anthers 10, fixed by the middle, opening lengthwise. 

 Calyx valvate. 



Suborder III. MIMOSEJE. 



Flowers regular, small, and numerous in spikes or heads. Xo perigynous disk. 

 Calyx and corolla valvate in the bud, 4 - 5-merous. Stamens as many or twice as 

 many as the petals, or numerous, hypogynous. Seeds mostly without albumen. 

 Itadicle not iucurved. Leaves usually twice pinnate. 



20. Prosopis. Stamens 10. Petals distinct or becoming so. More or less spiny shrubs or trees. 



Flowers greenish. 



21. Acacia. Stamens indefinitely numerous. Petals united below. Flowers yellow. 



1. THERMOPSIS, R. Brown. 



Calyx campanulate, cleft to the middle; teeth equal or the two upper ones united. 

 Standard roundish, shorter than the oblong wings, the sides reflexed : keel nearly 

 straight, obtuse, its petals somewhat united, equalling the wings. Stamens distinct. 

 Style slightly iucurved: stigma minute. Pod linear to oblong-linear, much com- 

 pressed, few - many-seeded, shortly stipitate or nearly sessile, straight or incurved. 

 — Stout perennial herbs, with erect clustered stem-; leaves digitately 3-foliolate, 

 with free foliaceous stipules, shortly petioled ; ballets entire ; flowers large, yellow, 

 in terminal racemes, with persistent herbaceous bracts; pedicels short, mostly soli- 

 tary, naked. 



About a dozen species, half belonging to Asia, and the rest to North America, Tin-. I these 



are confined to the Atlantic States and one I" the liocky Mountains. 



1. T. macrophylla, Hook. & Am. Villous with long spreading hairs : stipules 

 large, ovate ; leaflets oblong-elliptical, acute at each end. three inches long, glabrous 

 ali"\ e, toinentose and villous beneath: calyx-teeth acuminate: stamens somewhat, 

 persistent: pod villous, shortly stipitate. oblong-linear, nearly - inches long and 4 

 lines broad, straight, erect, 4 - ">-seeded. — Bot. Beechey, 329; Torr. & Gray, M. 

 i. 388. 



Collected by Douglas in California, but the locality unknown. All the specimens from other 



COlleCtionS that llMVe beell referred tn the Species, Seelll tn lielnlie t'l the 10 Xt . 



2. T. Californica, Watson. Woolly-tomentose throughout : stipules lanceo 

 late; leaflets obovate to oblanceolate, an inch or two long, acute or obtuse, equally 



toinentose on both sides : bracts broad at base, mostly ovate : pod very pubescent, 



