RELATION OF LEAF STRUCTURE TO PHYSICAL FACTORS 95 



IX. EXPLANATION OF PLATES 



All the figures are of cross-sections of the leaf, drawn to a scale of 100 

 magnifications. 



Plate I 



Fig. i. Isoetes lacustris paupercula, alpine lake. 



Fig. 2. Batrachium aquatile, alpine lake. 



a. Submerged. 



b. Amphibious. 



Fig. 3. Callitriche bifida, alpine lake. 



a. Submerged. 



b. Amphibious. 



Fig. 4. Hippuris vulgaris, alpine lake. 



a. Submerged. 



b. Aerial. 



Fig. 5. Sparganium angusti folium, alpine lake. 



a. Floating. 



b. Submerged. 



c. Deeply submerged. 



Plate II 



Fig. i. Saxifraga punctata, shady brook bank. 



Fig. 2. Limnorchis stricta, shady brook bank. 



Fig. 3. Vagnera leptosepala, shady brook bank. 



Fig. 4. Epilobium adenocaulon, shady brook bank. 



Fig. 5. Saxifraga debilis, alpine rock cleft. 



Fig. 6. Cicuta grayii, alpine rock cleft. 



Fig. 7. Adoxa moschatellina, alpine spruce forest. 



Fig. 8. Moneses unifiora, subalpine spruce forest. 



Fig. 9. Parietaria pennsilvanica, subalpine spruce forest. 



Fig. 10. Viola palustris, subalpine spruce forest. 



Fig. ii. Arnica cordifolia, subalpine spruce forest. 



Plate III 



Fig. i. Gyrostachys stricta, open spruce forest. 



Fig. 2. Castilleia sulphurea, open spruce forest. 



Fig. 3. Clementsia rhodantha, sunny bog. 



Fig. 4. Lilium tnontanum, sunny brook bank. 



Fig. 5. Senecio crocatus, sunny bog. 



Fig. 6. Veronica wormsjoldii, alpine meadow. 



Fig. 7. Agoseris aurantiaca, alpine meadow. 



Fig. 8. Draba streptocarpa, alpine meadow. 



