a" 
bo 
2 Index 
P. Senega, 62. P. Tweedyi, 70, 76. 
Fr serpens, 19, 21, 37, 116. P. uncinata, 91, 92. 
P. setacea, 101. P. variabilis, 92, 95, 96. 
P. setifera, 89. P. variabilis f. leucanthema, 96, 117. 
r, apathuleki: 79, ees 117. P. variabilis f. typica, 96 
P. spergulaefolia, 112. P. velata, 37, 41, 116. 
P. sphae sonsphiali; 79, 82. P. velutina, 112. 
P. sphaerospora, 60, 61. P. verticillata, 112. 
P. squamifolia, 79, 88, 117. P. verticillata var. aparinoides, 83. 
P. stellera, 94. P. violacea, 35, 69 
E. stipitata, 11, 15, 16, 116. P. virgata, 12. 
P. stric P. viridis, 103, 109 
fi siriaulees P. Vogtii, 83. 
P. subalata, Pi — 110, 111, 117. P. vulgaris, 112. 
P. tehuacana, 58, P. Watsoni, 102, 105, 118. 
P. tenella, 112. P. Wightiana, 79, 87, 117. 
ise 23, 36. P. Wrightii Chod. 63, 65. 
P. texensis, 70, 74. P. Wrightii Gray, 106. 
z ata, 89, 90, 117. P. Xanthi, 21. 
P. 60, 63, 117. P. Xanti, 19, 21. 
P. Torreyi, 86. P. zacatecana, 23, 26. 
_ egos Pui esi Securidaca volubilis, 1, 14, 15, 111. 
P. turgida, 79, 82, 111, 117. Viola punctata, 55. 
