270 PHANEROGAMOUS PLANTS. 



long, more or less pubescent, and slightly sprinkled with little glands. 

 Leaflets li to 2i inches long, and 1 to 2 inches wide, obtuse, pubes- 

 cent or almost villous when young, but nearly glabrous in the mature 

 plant, thickly dotted with dark-colored glands. Stipules broadly 

 ovate, small. Scapes or peduncles 1 or 2 feet long, naked, terete. Spike 

 2 to 5 inches long, and an inch or more in diameter, very villous with 

 soft hairs. Calyx villous, sometimes blackish, but more commonly 

 canescent, the hairs mixed with pedicellate glands ; the two upper 

 teeth more united than the lateral ones, all of them very acute. 

 Corolla purple, rather longer than the calyx. Vexillum oblong, one- 

 fourth longer than the narrow wings and keel. Stamens diadelphous 

 (9 and 1) ; the filaments (except the upper one) united nearly to the 

 summit. Ovary villous: style filiform, hairy below, dilated and 

 somewhat clavate upward : stigma capitellate and hairy. Legume 

 ovate, acute, much compressed. Seed oblong, dark-brown. A re- 

 markable species, differing from all others of the genus in its extremely 

 long peduncles and petioles ; but a genuine Psorcdea. 



6. PETALOSTEMON, Michx. 



1. Petalostemon macrostachyum, Torr. 



Hab. On the Walla- Walla River, Washington Territory. — In the 

 western plant the leaves do not acquire in drying the bright ver- 

 digris green on the upper surface, which is so striking a character 

 in Dr. James's specimens from the Forks of the Platte. The stems 

 are 2 to 3 feet high and somewhat clustered. Petals oblong, unguicu- 

 late. Teeth of the calyx as long as the tube. This is the only 

 species of Petalostemon found west of the Rocky Mountains. 



7. T R I F L I U M, Linn. 



1. Trifolium altissimum, Dougl. in Hook. 



Hab. On the Columbia, Spokane, and Kooskooskee Rivers ; abun- 

 dant in some places : flowering in May. — A tall, showy species, with 

 large oblong heads of purplish-red flowers. 



