Peritoma 
aureum, 210 
inornatum, 210 
luteum, 210 
serrulatum, 210 
Petrocallis Pyrenaica, 204 
Phacelia frigida, 39 
hyla ` 
betulæfolia, 48 
canescens, 48 
Chinensis, 47 
cuneifolia, 47 
Phyllitis lineata, 106 
Physalis 
polyphylla, 150 
Virginiana, 151 
Piarimula Chinensis, 47 
Platonia nudiflora, 47 
Polanisia tenuifolia, 212 
Polemonium luteum, 100 
Pyrus occidentalis, 131 
Ranunculus 
acriformis, 16 
cardiophyllus, 144 
Earlei, 15 
eremogenes, 144 
INDEX. 
Ranunculus—Continued. 
Eschschotzii, 15 
fasdicularis, 144, 145 
hispidus, 145 
ocreatus, 15 
trifoliatus, 144 
unguiculatus, 142 
vicinalis, 145 
Ribes 
amictum, 35 
aridum, 35 
cruentum, 35 
Rosa 
Arkansana, 13, 14 
blanda, 13 
Macounii, 10 
manca, 11 
melina, 10 
pratincola, 13 
amplectens, 177 
bicolor, 179, 180 
divergens, 177 
