300 LEGUMINOS^. Psohalea. 



4. P. longifolia (VuTih) : whole plant silky-villous ; leaves 3-foliolate, ob- 

 scurely glandular ; leaflets linear, elongated ; spikes pedunculate, loose, short- 

 er than the leaves ; teeth of the calyx and bracts lanceolate. — Pursh,Ji. 2. p. 

 741; DC.prodr.2. p. 220. 



On the Missouri, Bradbury .' (v. s. in herb. Lamb.) — Stem about a foot 

 high, apparently assurgent. Leaflets an inch long, scarcely one line wide. 

 Flower small. 



5. P. linearifolia: slightly pubescent with appressed hairs; stem tall, 

 slender, divaricately branched; leaves 3-foliolate, on short petioles; leaflets 

 narrowly-linear, elongated, mucronate, the upper surface dotted with black 

 glands; stipules minute, subulate, deciduous; peduncles hi i form ; racemes 

 loose, few-flowered, much longer than the leaves; calyx glandular, the teeth 

 lanceolate, acute, the lower one elongated. 



Arkansas, Beyrich ! communicated by Dr. Leavenworth. Stem sprink- 

 led with a few black dots. Leaflets 2-3 inches long, 1-2 lines wide, scarcely 

 glandular beneath. Racemes 6-8-flowered. Bracts lanceolate. Pedicels 

 slender, longer than the flower. 



6. P. scabra (Nutt. mss.): "much branched, somewhat hirsute when 

 young; leaves 3-foliolate, glandular ; leaflets all sessile, narrowly-linear, apicu- 

 late ; stipules minute, deciduous ; racemes few-flowered, on short peduncles ; 

 calyx glandular, the teeth obtuse. 



'' On the Walla-wallah, Mr. John Toxonsend. A slender species, with 

 small leaves and flowers. — In habit alhed to P. glandulosa of Chili." NuUall. 



7. P. cZi'o-ifaia (Nutt. ! mss.) : canescent, diff'usely branched; leaves 5-fo- 

 liolate ; leaflets cuneate-oblong, and oblong-linear, with an abrupt rigid point, 

 minutely dotted ; stipules lanceolate, reflexed ; spikes elongated, interrupted, 

 the clusters 3-6-flowered ; flowers sessile ; bracts obcordate or reniform; ca- 

 lyx villous ; segments ovate, acuminate, the lowest one produced. 



Sandhill? of Red River, Arkansas, NuUall ! Dr. Leavenworth ! West- 

 ern parts of Arkansas, Beyrich ! May. — Stem bushy, with slender branches. 

 Leaflets about one inch long, 2-4 Imes wide, glabrous above, hirsute beneath: 

 petioles shorter than the leaflets. Spikes many times longer than the leaves. 

 Calyx half as long as the corolla ; lowest segment one-third longer than the 

 others. Vexillum roundish-obovate. Legume orbicular-ovate, compressed, 

 hirsute, not wrinkled. Seeds ovate. 



8. P. floribiinda (Nutt. ! mss.) : canescent, not glandular, much branched ; 

 leaves 3-5-foliolate ; leaflets varying from linear to obovate-oblong, slightly 

 mucronate; stipules setaceous, minute; racemes many-flowered, oblong, 

 scarcely interrupted, twice as long as the leaves; pedicels as long as the 

 flowers ; bracts small, ovate, acuminate ; teeth of the calyx somewhat equal, 

 ovate, acute ; vexillum nearly orbicular. 



Plains of the Arkansas and Platte, nearly to the Rocky Mountains, Nutlall! 

 Arkansas, Dr. Pitcher ! and Dr. Leavenworth ! Illinois, Mr. Buckley ! 

 June. — Stem 2-4 feet high, somewhat spreading. Leaflets 2-4 lines wide, 

 longer than the petiole. Racemes 40-50-flowered : pedicels rather longer 

 than the bracts. Flowers about one-fourth of an inch long. 



9. P. obiusiloba: canescent; branches spreading; leaves 3- rarely 5-fo- 

 liolate ; leaflets oblong-obovate, obtuse or slightly emarginate, finely dotted; 

 stipules very minute ; racemes 3 times as long as the leaves, oblong, loose, 

 10-15-flowered ; bracts minute, broadly ovate, abruptly acuminate, spreading; 

 calyx very short; the teeth ovate, nearly equal, obtuse; vexillum roundish. 



Texas, Drmnmnnd ! — Plant clothed in every part with a minute appres- 

 sed pubescence, much branched. Leaflets about | of an inch in length. 

 Stipules almost none. Calyx scarcely \ the length of the petals. Legume 

 nearly glabrous, not wrinkled. 



