IOWA academy OF bCiENCES 
55 
CICHORIACEAE. 
CiCHOEIUM. ^ j 
722. C. intyhus L. Scarce in thickets and waste places. 
Tragopogon. 
ITi: T. yratensis L. Rare in waste places. 
724. T. porrifolius L. Scarce in waste places. Escaped from culti- 
vation. 
Taraxacum. 
725. T. tarazacum (L.) Ksirst. Abundant everywhere. (T. dens 
leonis Desf.) 
726. T. erythrospernum Andrez. Scarcer but not rare. 
SONCHUS. 
727. 8. oleraceus L, Common in fields and waste places. 
728. 8, asper (L.) All. Plentj;' in waste places. 
Lactuca. 
729. L. scariola L. Abundant as a weed in fields and in waste places. 
730. L. canadensis L. Scarce in moist soil. 
731. L. ludoviciana (Nutt.) DC. Scarce in waste places, 
732. L. floridana (L;) Gaertn. In moist soil. Somietimes 10 feet 
high. 
Lygodesmia. 
733. L. juncea (Pursh.) D. Don, Rare on high prairies 
Nothocalais. 
734. A. cuspidata (Pursh.) Greene. Abundant on prairie hillsides. 
^Hieeacium. 
735. H. canadense Michx. Scarce in dry woods. 
Nab ALUS. 
736. 2V. alhus (L.) Hook. Abundant in woods. (Prenanthes alda L.) 
737. N. asper (Michx. T. & G.) Plenty on dry prairies. {Prenanthes 
aspera Michx.) 
738. 2V, raeemosus (Michx.) DC. Scarce along edges of woods and 
on open prairie. (P. raeemosa Michx.) 
AMBROSIACEAE. 
IVA. 
739. I. xanthifolia (Fresen.) Nutt. Common in swampy fields. 
Ambrosia. 
740. A. trifida L. Plenty in fields and waste places. 
741. A. trifida integrifolia (Muhl.) T. & G. Scarcer; with the above. 
742. A. artemisiaefolia L. A common and troublesome w^eed every- 
where. 
743. A. psilostaehya DC. Rather scarce on dry prairies. 
Xanthium. 
744. X. canadense Mill. Comm.on in waste places. 
1 
compositae. 
Vebnonia. 
745. F. fasciculata Michx. Abundant in moist places. 
