79 



Poa, 12, 27, :U, ;iS, 72. 

 Podophyllum, 21. 

 Pogonia. 21, 33, (ID. 

 Polyo-ala, 31, 44, fil. 

 Polygoiiatuiii, 22, (!!). 

 Polygoiielhi, ij."), 07. 

 Polygomini, 42, 48, i")3. .");"), 



56, 67. 

 Polypodium, 34. 72. 

 Poutederia, 41 . GO. 

 Populus. 10, 11. (IS. 

 Portulaea. 4(i, 00. 

 Potaniogeton, 33. 70. 

 Poteiitilla, 12, 25, 2S. (12. 

 Prenaiithes. 51, 04. 

 Proseriiinaca. 43, 02. 

 Pruuus. 14, 19, 20, 28, 02. 

 Ptelia, 57. 

 Ptens, 34. 72. 

 Puocinellia, 27, 72. 

 Pycnantheiuum, 44, (!(). 

 Pyrola, 37, 65. 

 Pyms, 14, 18, 19, 20, 02. 



Quereus, 22, 08. 



Ranunculus, 17, 24, 30. 39, 59 

 Raphanus, 18, (Ki. 

 Retinospora, 10. 

 Rhamnus, 19, 25. (U. 

 Rhexia, 45, 62. 

 Rheum, 21. 



miododendron. 18. 20, 32, 05 

 Rhodotypus, 57. 

 Rhus, 30, 37, 45, 51, 57. 01. 

 Rhynchospora, 38, 70. 

 Ribes, 14, 62. 

 Robinia, 30, 61. 

 Rosa. 27, 31, 32, 02. 

 Rubus, 25, 28, 62. 

 Rudbeckia, 37, 64. 

 Rumex, 21, 28. 67. 

 Ruppia. 33, 70. 



yabbatia, 45, 05. 

 Sag'ina, 18, 60. 

 Sagittaria, 45, 70. 



Salit'ornia, 48. 07. 

 Salisburia. 19. 

 Salix, 10, 10, 08. 

 Salsola, 48, 07. 

 Sanibucus. 30, 39. 03. 

 Sauguinaria, 10. 

 Saniuula, 28. 03. 

 Saponaria, 43, 00. 

 Sarracenia, 25, 59. 

 Sassafras, 19. 07. 

 Saxlfniga, 13, 58, 02. 

 Schwalbea, 41, 00. 

 Scirpus, 20. 30, 70. 

 Seleranthus, 19. 07. 

 Scrophularia, 41, 0(i. 

 Scutellaria. 44, 00. 

 Secale, 27. 

 Seduni, 33. 48, (!2. 

 Selaginella, 50, 73. 

 Senecio, 9, 21, (54. 

 Sericoearpus, 40, (m. 

 Setaria, 49, 71. 

 Shepherdia, 13. 

 Sicyos, 47, 62. 

 Sllene, 21,31, 00. 

 Sinapis, 18, 60. 

 Sisymbrium. 23, (!0. 

 Sisyrinchium. 25, ()9. 

 Slum, 40, 03. 

 Smilaeina, 22. 20, 09. 

 Smilax, 20, 28, 69. 

 Solanum, 32, 44, 06. 

 Solidago, 52, 54, .55. 03. 

 Sonehus, 32, 43, 04. 

 Sophora.'57. 

 Sparganium, 3S. 70. 

 Spartina, 49. 71. 

 Specularia, 33, 65. 

 Spergula, 18, (!0. 

 Spir.-ea, 19, 27,35,36,43. 

 Spiranthes, 49. 54, 69. 

 Sporobolus, 54, 56, 71. 

 Stachys, 44, 67. 

 Statice, 49, 65. 

 Steironema. 44, 65. 

 Stellaria. 9, 43, 60. 

 Stii)a. 29. 71. 



Strophostyles. 4(;. 01. 

 Styrax, 35. 

 Sujeda, 48, 67. 

 Symphori('ar])Os, 31 . 

 Symi»hytum, 37, 65. 

 Sym])locarpus, 9. 70. 

 Syringa, 23. 



Tamarix, 27. 

 Tanacetum, 43, 04. 

 Taraxacum, 12, 64. 

 Taxodium, 10, (>S. 

 Taxus, 10. 

 Tecoma, 50. 

 Tephrosia, 30. 61. 

 Teucrium, 44. 6(;. 

 Thalictrum, 21, 31, 59. 

 Thlaspi, 20, 60. 

 Thuya, 10, 68. 

 Tiarella, 20. 

 Tilia, 35. 



Tradescantia, 29, 69. 

 Trichostema, 53, 66. 

 Trientalis, 20. 65. 

 Trifolium, 24. 31, 61. 

 Ti'iglochin, 25. 70. 

 Trillium, 23, 69. 

 Triodia, 56, 71. 

 Tiisetum. 34, 71. 

 Triticum, 38, 72. 

 Tsuga, 22, 08. 

 Tussilago, 11. (i4. 

 Typha. 38. 70. 



Ulmus, 11, 67. 

 ITi-tica, 34, 08. 

 rtiicularia, 45, (iO. 



Yaccinium. 14, 19, .37, 05. 

 (i2. Verbascum, 37, 6(i. 

 Verbena, 44, 66. 

 Vernonia, .34, 54, 63. 

 Veronica, 14, 26, (i5. 

 ^•ibu^num, 27, 28, 32, 03. 

 Vicia, 30. 61. 

 Vinca, 9. 

 Viola, 10. 12, 13. 60. 



