393 APPENDIX. 



XV. CLASS MONADELPHIA. 



66. Geranium robertianuni, Nutt. Gen. II. p. SO. 

 Common in Penns3dvania. 



XVI. CLASS DIADELPHIA. 



67. Petalostemum candidum, Pursh, p. 461. 

 Indigenous to the western country. 



68. Petalostemum violaceum, Pursh, p. 461. 

 Likewise peculiar to the western countries. 



Both these plants are well described by Michaux, and * 

 figured on his Tab. 37, f. 1 and 2. 



69. Corydalis glauca, Pursh, p. 463. 

 Common among rocky hills. 



70. Amorpha canesceiis, Nutt. Gen. II. p. 92. 

 Peculiar to the north-western country. 



71. Lathyrus7?«/'W5/H5, Pursh, p. 471. 



Found in Canada by Michaux, and common in Europe. 



72. Lathyrus venosus, Pursh, p. 471. 

 Common in the Pennsylvania mountains. 



73. Vicia *tridentata, L. v. Schw. 



The single, but good specimen of this plant, does not 

 agree, I think, with any one described by American au- 

 thors or Persoon. I therefore venture to point it out by the 

 above name, taken from the singular form of its stipules. 

 It approaches nearest to V. sylvatica. 



Stem flexuosely bent, subpubescent, angular and much, 

 grooved. Peduncles equal to the leaves. Leaflets nume- 

 rous, sometimes alternate, sometimes opposite, narrow, ob- 

 long, entire, obtuse, with a short mucro, sprinkled with 

 hair on the upper surface, and almost canescently so on 

 the under. Stipules, upper ones lanceolate, long, acuminate, 



