PlantcB Lindheimeriance. 215 



Wright.) Stems diffuse, decumbent, from a filiform, often 

 tuberiferous root. Leaflets of the lower leaves orbicular, of 

 the upper rhombic-ovate and mostly acute. Peduncles in our 

 specimens commonly shorter than the leaves. Legume mem- 

 branous, suborbicular, rostrate, transversely dehiscent ; the 

 upper part strigose-pubescent, the lower glabrous and some- 

 what rugose. Seeds orbicular, compressed. The singular 

 transverse dehiscence of the pod appears to confirm the 

 opinion that Psoralea belongs to the tribe Hedysareae. 



36. P. obtusiloba, Torr. 8f Gr. I. c. Dry prairies east of 

 the Brazos, flowering early in the season. Legumes glandular. 

 The allied, but distinct, P. floribunda is wrongly described as 

 " canescent but not glandular," whereas the plant is gen- 

 erally glandular, often very much so. 



37. Amorpha paniculata, Torr. fy Gr. Fl. I. p. 306. 

 Thickets, Galveston Bay, and west of the Brazos. June, July. 

 A stately plant, 6 to 9 feet high, the long spikes clustered in 

 ample panicles. 



38. A. glabra, Desf. ; DC.prodr. 2. p. 256. Wet prairies, 

 Houston, &c. 



39. Dalea aurea, Nutt. West of the Brazos. June to 

 August. 



40. Petalostemon obovatum, Torr. &f Gr. Fl. I. p. 310. 

 Brazos. August. 



41. P. PHLEOIDES (9 MICROPHYLLUM, Tort. &f Gr. I. C. 



Sandy elevations in the prairies west of the Brazos. July. 



42. P. violaceum, Michx. : a pubescent variety. 



43. P. multiflorum, Nutt. On the Brazos. August. 



44. Trifolium reflexum, Linn. Galveston. May. 



45. Astragalus Nuttallianus § trichocarpus, Torr. &/• 

 Gr. Fl. I. p. 334. Coast of Galveston Island, on soil com- 

 posed of fragments of shells ; while A. Nuttallianus is found 

 in prairies in the interior of the island. The present variety, 

 if such it be, has rather shorter as well as hairy pods, with 

 usually 7-8 seeds in each cell, while in the true A. Nuttalli- 

 anus there are commonly 10-12. 



