GENERIC INDEX. 
Picea, ix., 80; x., 47; xi., 65; xii., 24, 75; xiil., 
88, 126; xiv., 195; xv., 128, 1386; xvi-, 121, 
297, 290, 311. 
Picramnia, xvi., 160. 
Picridium, xv., 223. 
Picris, vii., 125, xi., 35; xvi., 24. 
Pilocarpus, xiv., 56. . 
Pilularia, xiv., 23; xv., 259; xvi, = 
Pimpinella, xiv., 79. 
Pinguicula, x., 35; xiL, 100. 
_Pinnularta, xiv., 70, 71, 72, 73, 109; Xvi., 99, 100, 
Pinus, vii., 14, 25, 39-48, 72, 102, 105; viil., 6, 
23, 46, 71; ix., 80, 106, 108, 156; x., 33, 47, 82, 
93, 94, 105, 106, 107, 118, 122, 182; x1. 22, 23, 
40, 97, 99, 100, 101, 128; xii., 24, 41, 42, 50, 61, 
65, 66, 68, 75, 81, 93, 94, 114, 132; xill., 5, 35, 
64, 70, 99, 121, 122, 148, 150, 178, 193, 198, 208, 
945; xiv., 81, 88, 129, 153, 189, 200, 241, 247; 
XV., 114, 128, 136, 243, 244, 306; xvi., 88, 90, 
187, 142, 163, 167, 172, 179, 194, 199, 256, 290, 
294, 311, 338. 
Pisum, xtil., 17; xvi., 242. 
Piper, xvi., 309. 
Piptadenia, xvi., 326. 
Piptocalyx, xiv., 191. 
Pitcairnia, viii., 118; xv., 224, 242; vi; 168. 
Pithecolobium, xvi., 310, 327. 
Pithophora, x., 13; xii, 126; xfif., 65. 
Plagiochaila, xiil., 180. 
Plagiogramma, xvi., 209. 
Plagiospermum, x., 15. 
Plagiothecium, vii..8.  . 
Plagiobothrys, xli., 11; xiv., 100, 150. 
- Placodium, xtit., 149; XVL, 198. 
- Plantago, vil , 67, 68, 96, 125; 1x., 10, 36, 74; xf., 
15; Xil., 48; xiii, 61, 73, 95, 187, 246; xiv., 
TT, 145, 147, 148, 200, 231, 236; xv., 136; XVi., 
70, 281, 289. 
_ Plasmodiophora, Riv., 199. 
- Platanus, vil., 80, 108; ix., ba 4h, a,b xy 
47; xiil., 126, 247; xv., 146, 208; xvi, aut 257. 
_ Platanthera, vii., 83. 
Platygrapha, xvi., 203, 380. 
_ Platystemon, xili., 218, 224; xvi, 339. 
-~Platysticta, xvi., 203. 
‘Platystigma, xiil., 218, 
-Plectritis, vili., $1. 
Pleonectria, X., 49. 
Pleospora, viil., 125; x., 53; AAS 75; XV, 204. 
Pleuchea, vill., 120 
Pleuraphis, 1x., 32, 86, 135, 136. 
Pluerocarpus, vii., 47; xi., 15; xvi., 184. 
Pleurococcus, Xi., 101., 102. 
Pleuropogon, ix., 135, 137; xX., 65. 
Pleurosigma, xiv., 27, 29, 31; xv., 130, 131, 183; 
XVi., 75. 
Pleurotzenium, vil., 44; vill., 4. 
‘ 
Pleurotis, xiv., 244; xvi, 202. 
Plocamium, Xxv., 19. 
Piceospora, ix., 70. 
Pluchea, xi., 103; xiv., 44. 
Pluteus, xii, 124. 
Poa, vii., 126; ix., 72, 185, 151; X., 8, 31, 65, 66, 
TT; Xi., 126; xil., 25; xfif., 76; xiv., 94, 151, 
221; xv., 11, 49; xvi., 206, 231. 
Podaxon, vii., 58; viil., 84; ix., 2. 
Podistera, xiv., 169. 
Podocarpus, xVi., 13. 
Podophyllum, vii., 11; viil., 7; ix., 10, 140; x., 
49; xi., 62; xif., 12; xfii., 88, 101, 114, 115; 
xiv., 80, 130, 140; xv., 214; xvL., 244. 
Podoszemum, ix., 88. 
Podosciadium, x., 69. 
Podosira, xiv., 32; xvi., 75. 
Podospheera, xiv., 193, 195; xvi., 231. 
Podostemon, xvi , 312. 
Podozamites, vil., 77; xii., 91, 92; xiil., 35. 
Pogogyne, Xv., 114. 
Pogonatum, xvi., 96, 110, 807. 
Pogonla, Vii., 118; viii., 108, 114; x , 9, 67; xiii., 
5; Xiv., 12,154; xv., 243; xvi., 38. 
Pogonopus, Xvi. 227. 
Pohlia, xvi., 110, 
Polanisia, xili., 60, 117; xiv. 223. 
Polemonium, viii, 6, 75; ix., 72; x., 9; XIi., 53; 
xili., 115; xiv., 184, 262: xv., 24, 128, 328. 
Polia, xiv., 159. 
Polycarpon, X., 82. 
Polycystis, xv., 310. 
Polyedrium, ix., 26; x., 15; Xvi., 183. 
Polygala, vii., 82; vili., 92, 115, 120; ix., 24; x., 
35, 120, 125; xf., 12; xii., 100, 101; xifi., 5, 12, 
70, 75, 126, 220; xiv., 128, 160, 186, 187, Xv., 
132; Xvi., 19, 179, 312. 
Polygonatum, vil., 49, 54; xiv., 86, 186. 
Polygonastrum, xv., 285. 
Polygonum, Vii., 28, 54, 57, 125; vili., 23, 28, 48, 
99, 106, 120; ix., 35, 73; x., 107, 121; xil., 25, 
40, 103; xiii., 5, 6, 61, 94, 117; xiv., 14, 44, 86, 
153, 164, 236, 252; xv., 136; xvi., 38, 169, 256, 
286, 289. 
Polyides, xiff., 112. 
Polymnia, x., 9. 
Polypodum, vii., 26, 85, 94, 97; ix., 22, 49, 151; 
X., 26, 33, 59, 101; XL, 7, 48, 182; xifl., 81, 
117; Xiv., 16, 87, 108, 164, 181; xv., 229, 251; 
Xv1., 58, 290, 312, 329. 
Polypogon, Viii., 76; ix., T7, 184, 158; x., 8, 64. 
Polyporus, vil., 102-105; viif., 20, 34, 51; Ix., 
120; xi., 26, 27; xti., 20; xlil., 14, 82, 64, 151, 
175, 193; xlv., 24, 130, 221; xv., 115, 184; 
Xvi., 178. 
Polypteris, xi., 128. 
a 
' Polysiphonia, xi., 29, 30; xili., 113, 114; xiv. 
28; XV., 314; xVi., 6. 
Polystichum, see Aspidium. 
Polystictus, xvi., 202. 
