APPENDIX.
393
villous, lower ones obversely cuneate and broadly trifid, with strong nerves running to the point of each division, pubescent as well as the calyx and peduncle. Flowers blue and large in proportion. Hab. Rainy Lake.
74.  Astragalus carolinianus, Pursh, p. 472. Common in the mountains of Carolina.
75.  Astragalus hypoglottis? Nutt. Gen. II. p. 99. Very imperfect specimen in fruit.    Leaflets more ovate
- than the European specimens.
Hab. Prairies of St. Peter's and Red rivers.
76.  Psoralea esculenta, Nutt. Gen. II. p. 102. Peculiar to the north-west.
Hab. Between Chicago and Prairie du Chien, and on the prairies of St. Peter's river.
77.  Psoralea incana, Nutt. Gen. II. p. 102. Likewise peculiar to that district.
The fine specimens of the collection differ from Mr. Nuttall's description in being much branched and to all appearance of a larger size.
XVII. CLASS SYN.GENESIA.
78.  Prenanthes virgata, Pursh, p. 498.
There are a number of species of this genus which have fallen under my observation, not distinctly established. The leaves are, however, so variable, that it would be highly improper to establish new ones from single specimens, especially when destitute of radical leaves. The present plant has certainly not occurred to me with exactly this form of cauline leaves, but in other respects it perfectly resembles the P. virgata of Pursh.
79.  Lactuca integrifolia? Nutt. Gen. II. p. 124.