98 ILLINOIS BIOLOGICAL MONOGRAPHS [188 



EXPLANATION OF PLATE 



Fig. 13, a-e — Cuscula pringlei 



Fig. 14, a-e — Cuscuta choisiana 



Fig. 15, a-e — Cuscuta deltoidea 



Fig. 16, a-e — Cuscuta tinctoria typica 



Fig. 16, f-g — Cuscula tinctoria kellermaniana 



Fig. 17, a-e — Cuscuta gracillima subtilis 



Fig. 17, f-g — Cuscuta gracillima saccharata 



Fig. 18, a-e — Cuscuta lacerata 



