ANATOMY OF SOME PLANTS OF A PROVINCE IN IOWA 
85 
EXPLANATION OF PLATES IX-XIV 
The figures were made with the aid of a camera lucida and are magnified approximately 
30 diameters. 
Ed, dorsal epidermis; Ev, ventral epidermis; P, palisade parenchyma; Sp, spongy 
parenchyma; VB, vascular bundle; h, bulliform cell; r, resin duct; s, stomate; t, trichome; 
cps, chlorophyll parenchyma sheath. 
Plate IX. Fig. i, Andropogon scoparius; Fig. 2, Bouteloua curtipendula; Fig. 3, 
Muhlenhergia mexicana; Fig. 4, Leersia oryzoides; Fig. 5, a and 6, Polygonum Muhlenhergii; 
Fig. 6, Anemone cylindrica. 
Plate X. Fig. 6a, Baptisia leucantha; Fig. 7, Amorpha canescens; Fig. 8, Ceano- 
thus americanus; Fig. 9, Steironema lanceolata; Fig. 10, Apocynum cannahinum; Fig. 11, 
Asclepias verticillata. 
Plate XI. Fig. 12, Mentha arvensis var. canadensis; Fig. 13, Physostegia virginiana; 
Fig. 14, a and h, Lycopus virginicus; Fig. 15, a and h, Mimulus ringens; Fig. 16, Eryngium 
yuccaefolium. 
Plate XII. Fig. 17, Aster salicifolius; Fig. 18, Helianthus tuherosus; Fig. 19, 
Helianthus grosseserratus; Fig. 20, Coreopsis palmata; Fig. 21, Solidago graminifolia; 
Fig. 22, Silphium laciniatum. 
Plate XIII. Fig. 23, Solidago serotina; Fig. 24, Artemisia ludoviciana; Fig. 25, 
Solidago canadensis. 
Plate XIV. Fig. 26, Solidago rigida; Fig, 27, Vernonia novehoracensis. 
