24 GENERIC INDEX. 
Polystigma, xvi., 26. 
Polytznia, vii., 87. 
Polytoma, xili, 102. 
Polytrichum, ix., 133; xiv., 250; xv., 186, 243; 
Xvi, 96, 110, 250. 
Pontederia, vil., 97; viil., 125; x1., 90; xiii, 94; 
Xiv., 159; xvi., 242, 290. 
Populus, vil., 25, 57, 107; viii., 22; ix., 8, 79, 106; 
ix., 156; X., 38,128; X1.; 29, 23; xif., 24, 75, 
82, 94; xili., 89, 90, 91, 107, 195, 233; xiv., 
114, 132, 230, 236; xvi., 121, 290. 
Porella, xvi., 79. 
Porphyra, 1x., 70; xi., 181; xifl:, 109; xv., 19. 
Porphyridium, viii., 40; xvi., 184. 
Portlandia, xvi., 175. 
Poseidonia, xiil., 159. f 
Potamogeton, Vil., 18, 27, 71, 116; vili., 21, 59, 
120; ix., 34, 36, 150; x., 92, 107, 121; xi., 32; 
Xii., 12, 26, 40; xiil., 94, 95, 97, 145, 154, 171, 
252; Xiv., 52, 237, 243; xv., 94, 296; xvi,, 36, 
88, 120, 124, 134, 256, 264, 290, 312. 
Portulaca, vili., 115; ix., 5, 153; xi., 106; xiv., 
101, 147, 262; xv., 246; xvi., 62, 145. 
Potamogeton, xi., 90, 91; xlif., 84. 
_ Potentilla, vii., 19, 28, 93, 124; vill., 23, 47, 97; 
ix., 23, 36; X., 9, 36, 46; xi., 92, 99, 100, 128, 
139; xii., 24, 26, 53, 94, 103; xfil., 6, 73, 188, 
189, 195, 246; xiv., 280, 232, 233, 252, 261, 263; 
XV-, 58, 93, 243; xvi., 70, ome 151, 205, 221, 
287, 312. 
Poterium, vii., 124; xi., 36; xiv., 233. 
Pottia, xv., 186; xvi., 107. 
Prasiola, viii:, 40; ix., 25, 66. 
Prenanthes, xi., 102, 104; xifi., 73; xiv., 234; 
XV., 136, 301; xvi., 288, 329. 
Primula, viil., 81, 122; ix., 139; xi., 130; xil, 
39; XV., 276; Xv1., 35. 
Pringleophyton, xii., 11. 
Prionosciadium, xv., 200. 
Prionitis, xv., 184. 
*Prochnyanthes, xiv., 168. 
Prockia, xvi., 157. 
Prodorus, xiii., 141. 
Prodoxus, xiil., 139. 
Pronuba, xiil., 141. 
Propolis, vili., 65, 124. 
Prosartes, xi., 36; xv., 188. 
Proserpinaca, Vii., 27. : 
Prosopis, ix., 54; X., 122; xiv., 161,241; xv.,179; 
XVL, 86. 
Protium, xvi., 189. e 
Protococcus, ix., 94; X., 15, 136; xiil., 86, 87, 
99; xvi., 80, 35. 
Protophyllum, xiii., 38. 
Protosalvinia, xv., 300. 
Prunus, vii., 114; viii., 29, 48, 70; 1x., 53, 149, 
156; X., 44, 81; xi., 11, 98, 92, 108, 197; xti, 
39, 82, 85, 86; xill., 36, 83, 94; xiv., 187, 191, 
206, 207, 230, neal xV., 174, 175, 267, 288, 397; 
mires 287. 
7 
Psamma, ix., 135. 
Pseudauliscus, xvi., 75: 
Pseudocymopterus, xvi., 122. 
Pseudophcenix, xiv., 21; xv., 276; xvi., 58. 
Pseudotsuga, 1x., 79, 106; x., 42, 47; xii., 24; 
Xiv., 196; xvi., 203. 
Psilocarya, xv., 101. 
Psilophyton, vii., 75. 
Psilotum, ix., 128; xiif., 135; xiv., 244. 
Psoralea, xiv., 40, 241; xvi., 70, 259, 279. 
Psoroma, xiv., 222. 
Ptelea, xi,, 10, 12; xfii., 126; xiv., 167, 196; xv., 
299; xvi., 310. 
Pteris, vii., 60, 85, 114; viil., 88; ix., 69, 129; x., 
69; xi, 7; xill., 117; xiv., 181, 231; xv., 186, 
249; xvi., 290. 
Pterocarpus, XV., 188; xvi., 324, 325. 
Pteropsis, viii., 89. 
Pterostegia, xifi., 147; xvi., 277. 
Ptilocalais, xiii., 66; xvi., 150. 
Ptilonia, xv., 19. 
Ptilota, xi., 30; xifi.. 111; xv., 19, 313. 
Ptychomitrium, vil., 5; xvi., 109, 225. 
Puccinia, viii., 86, 125; ix., 183; xi., 32, 49, 58, 
64, 65, 93; xii., 34, 35, 44, 108; xiv., 20; xv.» 
119, 149, 257; xvi., 84, 122, 196. 
Pulmonaria, x., 83, 
Punctaria, xili., 107; xv., 811. 
Purshia, xii., 37. 
Puya, Xvi., 306. 
Pycnanthemum, Vil., 18, 53, 121; vill., 130; x., 
9; xii., 39; xvi., 133, 247. 
Pylaisea, xv., 186, 201. 
Pyrenophora, xi., 28. 
Pyrenothamnia, x., 22; xi., 25. 
Pyrenula, xii., 62; xiv., 249; xvi., 330. 
Pyrola, vil., 19; 1x., 114; X., 38; xi., 36; xii., 17, 
20; xill., 250; xv., 128, 136, 230; xvi., 183, 
263. 289. 
Pyrrhopappus, Xv., 214. 
Pyrularia, xiil., 74. 
Pyrus, Viii., 86; ix., 36, 149; x., 45, 67, 121, 136; 
Xi., 36, 128; xil., 39, 85, 103; xiii, 94, 176; 
Xiv., 230, 233; xv., 58, 200, 276; xvi., 287. 
Pyxidanthera, xiv., 87, 108; xvi., 194. 
Pyxidicula, xvi., 75. 
Pyxine, xiv., 222. 
Quamoclit, xiv., 164. - 
Quercus, vii., 12, 14, 70, 82, 101, 108, 118, 114, 
115; vill., 7, 11, 23, 50, 65, 126, 132; ix., 10, 
13, 15, 16, 55, 57, 78, 106, 111, 118, 152, 156; 
X., 9, 25, 91, 105, 106, 121, 199; X1., 24, 40, 42, 
73, 90, 99, 108, 117, 118, 120, 127; xil., 40, 82, 
90, 115, 119, 124, 132; xffi., 12, 40, 41, 65, 69, 
74, 78, 79, 95, 117, 126, 150, 200, 202, 203, 225, 
238, 250; xiv., 6, 81, 105, 171, 185, 187, 188, 
190, 195, 226, 241, 247; xv., 51, 150, 275, 303. 
327; xvi., 36, 58, 60, 105, 123, 138, 145, 177, 
194, 289, 311, 334. 
Quesnelia, Xvi., 227. 
