RELATION OF LEAF STRUCTURE TO PHYSICAL FACTORS 1OI 



Pachylophus caespitosus, 78, 85, 86, 



PI. IX : la, b. 

 Parietaria pennsilvanica, 33, 34, PI. 



II: 9- 



Paronychia pulvinata, 41. 

 Pedicularis canadensis, 36; Pedicu- 



laris parryi, 36; Pedicularis pro- 



cera, 39, PL IV: 5- 



Pentstemon brandegei, 43; Pentste- 

 mon brandegei prostratus, 43; 

 Pentstemon glaucus, 68, 85, 86; 

 Pentstemon hallii nanus, 43; Pent- 

 stemon humilis, 42; Pentstemon 

 torreyi, 43; Pentstemon unilater- 

 alis, 43, PL V:7- 



Pericome caudata, 36. 



Phacelia glandulosa, 39; Phacelia 

 heterophylla, 39; Phacelia lyallii, 



39, PL IV: 4. 



Physaria acutifolia, 40. 



Pirola chlorantha, 37. 



Plantago purshii, 41. 



Polemonium pulchellum, 53, 83, 84, 

 87, 88, PI. VI:4a, b; Polemonium 

 speciosum, 34. 



Polygonum bistortoides, 60, 82; 

 Polygonum convolvulus, 68, 85, 86, 

 PI. VIII :2a, b; Polygonum vivi- 

 parum, 37. 



Populus tremuloides, 37, PI. IV : 2. 



Potentilla bipinnatifida, 39; Poten- 

 tilla coloradensis, 42; Potentilla 

 minutifolia, 39; Potentilla monspe- 

 liensis, 39; Potentilla propinqua, 

 64, 85, 86; Potentilla pulcherrima, 

 39; Potentilla rubricaulis, 39. 



Primula angustifolia, 36; Primula 

 parryi, 55, 89, PI. VII : la, b. 



Prunus demissa, 63, 85, 86. 



Pseudocymopterus anisatus, 75, 85, 

 86 ; Pseudocymopterus montanus, 

 40 ; Pseudocymopterus montanus 

 purpureus, 38, PI. 1:7; Pseudocy- 

 mopterus tenuifolius, 54, 85, 86, 87, 

 88. 



Psoralea lanceolata, 44. 



Pulsatilla hirsutissima, 39. 



Quercus novimexicana, 62, 83, PI 

 VII : 43, b. 



Ranunculus inamoenus, 61, 82. 



Rhus trilobata, 37. 



Rosa sayii, 33. 



Rudbeckia flava, 74, 85, 86; Rud- 

 beckia laciniata, 55, 83, PL VI: 

 6a, b. 



Rydbergia grandiflora, 45, 62. 



Salix nuttallii, 37; Salix pseudolap- 

 ponum, 37; Salix saximontana, 37, 

 PL IV: i. 



Saxifraga debilis, 32, 35, PL II:s; 

 Saxifraga interrupta, 61, 83, 84; 

 Saxifraga punctata, 31, PL II : i. 



Scutellaria brittonii, 70, 85, 86, PL 

 VIII : 4 a, b. 



Sedum roseum, 35. 



Senecio carthamioides, 32, 35; Sene- 

 cio chloranthus, 36, 38; Senecio 

 crocatus, 35, PL 111:5; Senecio 

 eremophilus, 39; Senecio pudicus, 

 38, 53, 87, 88; Senecio rosulatus, 

 76, 81, 85, 86; Senecio spartioides, 

 78, 85, 86; Senecio taraxacoides, 

 44- 



Sibbaldia procumbens, 39. 



Sideranthus spinulosum, 40. 



Sieversia turbinata, 60, 83. 



Solanum triflorum, 79, 85, 86. 



Solidago decumbens, 41 ; Solidago 

 extraria, 41, 74, 85, 86; Solidago 

 missouriensis, 41; Solidago multi- 

 radiata, 41 ; Solidago oreophila, 

 41 ; Solidago pallida, 40, PL V : i. 



Sparganium angustifolium, 47, 83, 84, 

 PL I: 5 a, b, c. 



Spergula sp., 36. 



Streptopus amplexifolius, 32, 34. 



Swertia scopulina, 60, 82. 



Symphoricarpos oreophila, 68, 85, 86. 



Tetraneuris glabriuscula, 40; Tetra- 

 neuris lanata, 40. 



Thalictrum sparsiflorum, 52, 83, 85, 

 86, 87, 88. 



Thelesperma gracile, 40. 



Thelypodium micranthum, 42. 



