CATALOGUE. 87 



Hoffmanseggia. Low herbs or woody at base. Pod flat. Seeds without 



albumen. 

 Pakkinsonia. Somewhat spinescent shrubs or trees. Pod more or less 



torulose. Seeds albuminous. 



* • Leaves simply and abruptly pinnate : anthers 10 or fewer, fixed by the base, 



opening by terminal pores : calyx imbricated. 

 Cassia. Herbs or woody at base. Pods rather thick or flat. Seeds albu- 

 minous. 

 Suborder III. MIMOSEiE. Flowers regular, small, in spikes or heads, perfect or 

 polygamous. Calyx and corolla valvate, 4-6-toothed or divided. Perigy- 

 nous disk none. Stamens as many or twice as many as the lobes of the 

 corolla, or numerous, hypogynous. Seeds mostly without albumen. Radicle 

 not inflexed. Leaves usually bipinnate. 



* Stamens twice as many as the petals or just as many: pollen-grains numerous. 



Prosopis. Shrubs or trees, more or less spiny. Petals distinct or becoming 



so. Flowers greenish, in heads or cylindrical spikes. Pod straight or 



coiled, at length thick and pulpy within. 

 Desmanthus. Herbs, unarmed. Flowers purplish, in globose heads. Pod 



flat and thin, not jointed, 2-valved. 

 Mimosa. Herbs or shrubs, armed with prickles. Flowers in heads or short 



spikes. Valves of the pod separating from the persistent margins, entire 



or jointed. 



* * Stamens numerous : pollen-masses 4 to 6 in each anther-cell. 



Acacia. Shrubs or small trees, usually armed. Flowers capitate or spicate, 

 yellow. Stamens distinct. Pod flat, 2-valved. 



Calliandra. Herbaceous or shrubby, unarmed. Flowers capitate. Sta- 

 mens united at base into a tube, long-exserted, purple or white. Pod 

 dehiscing elastically from the apex downward. 



Thermopsis* Montana, Nutt. (Toit. & Gray, Fl. i, 300). (T. fdbacea, 

 DC, var. montana, Gray.) — Somewhat silky-pubescent, at least on the 

 under surface of the leaves : leaflets oblong-obovate to narrowly oblong, 

 obtuse or acutish, smooth above, one to three inches long; stipules ovate 

 to lanceolate, exceeding the petioles : bracts oblong to linear-lanceolate : 

 pod linear, straight, erect, pubescent, two or three inches long and 10-12- 

 seeded, on a stipe shorter than the calyx-tube. — On stream-banks in the 

 mountains, from Wyoming Territory to New Mexico and westward to 

 Oregon; Northern Nevada, 1871; Denver, Colo. (201). 



"Thermopsis, R. Brown.— Calyx canipanulate, equally cleft to the middle, or the two upper teeth 

 united. Standard broad, shorter than the straight wings, the sides reflexed. Stamens distinct ; anthers 

 uniform. Pod coriaceous, linear to oblong-linear, flattened, few-many-sceded, nearly sessile. — Stout 

 perennial herbs, with digitately 3-foliolate leaves on short petioles ; leaflets entire and stipules foliaceous ; 

 flowers large, yellow, in terminal racemes, with persistent herbaceous bracts. 



