ECOLOGIC SUBTERRANEAN ANATOMY OF PLANTS 
Plate XX 
Fig. I. Polygonum Muhlenbergii, rhizome, X 45. 
Fig. 2. Polygonum Muhlenbergii, root, X 45. 
Fig. 3. Ranunculus delphinifolius, root, X 100. 
Plate XXI 
Fig. I. Heuchera americana, rhizome, X 80. 
Plate XXII 
Fig. I. Potentilla arguta, root, X 100. 
Fig. 2. Petalostemum candidum, root, X 75. 
Fig. 3. Asclepias verticillata, rhizome, X 75- 
Plate XXIII 
Fig. I. Baptisia leucantha, root, X 150. 
Fig. 2. Gentiana puberula, root, X 150. 
Plate XXIV 
Fig. i. Monarda fistulosa, rhizome, X 125. 
Fig. 2. Artemisia ludoviciana, rhizome, X 50. 
Plate XXV 
Fig. I. Viola pedata, rhizome, X 75. 
Fig. 2. Heliopsis scabra, rhizome, X 90. 
Plate XXVI 
Fig. I. Antennaria plantaginijolia, rhizome, X 165. 
Fig. 2. Aster azureus, rhizome, X no. 
Plate XXVII ' 
Fig. I. Vernonia fasciculata, rhizome, X 60. 
•Fig. 2. Vernonia fasciculata, root, X 90. 
Fig. 3. Helianthus tuber osus, rhizome, X 76, 
Plate XXVIII 
Fig. i. Lepachys pinnata, rhizome, X 85. 
Fig. 2. Liatris squarrosa, corm, X 16. 
