100 ILLINOIS BIOLOGICAL MONOGRAPHS [190 



EXPLANATION OF PLATE 



Fig. 19, a-e — Cuscuta macrocephala 



Fig. 20, a-e — Cuscuta tuberculata 



Fig. 21, a-e — Cuscuta harpcri 



Fig. 22, a-e — Cuscida americana 



Fig. 23, a-e — Cuscuta purpusii (d represents the ovary) 



Fig. 24, a-e — Cuscuta corymbosa grandiflora 



Fig. 24, f — Cuscida corymbosa stylosa 



