58 
IOWA ACADEMY OF SCIENCES 
815. H. grosse-serratus Martens. Common on prairies and along 
streams. 
816. H. decapetalus L. Scarce along streams. 
817. H. tuherosus L. Scarce in moist soil. 
Coreopsis. 
818. C. palmata Nutt. Abundant on prairies. 
Bide.\s. 
819. B. laevis (L.) B. S. P. Scarce in fields and meadows. 
820. B. cernua L. Plenty in waste places. 
821. B. connata Mubl. Scarce in moist soil. 
822. B. comosa (A. Gray) Wiegand. Scarce in moist soil. 
823. B. frondosa L. Abundant in fields and woods. 
824. B. trichosperma tenuiloha (A. Gray) Britton. Rare. Adventive. 
825. B. involucrata (Nutt.) Britton. Scarce in swamps. 
Galiasoga. 
826. G. parviflora Cav. Rare in waste places. 
Heleaium. 
827. li. autumnale L. Abundant in fields and swamps. 
Boebera. 
828. B. papposa (Vent.) Rydb. Common in waste places. (Dysodia 
papposa (Vent.) A. S. Hitchc.) 
Achillea. , 
829. A. lanulosa Nutt. Abundant on prairies. 
830. A. millefolium L. Less common and usually in the pink flow- 
ered form. 
Anthemis. 
831. A. cotula L. Common waste places and along roadsides. 
832. A. arvensis L. Scarce in fields. 
Taaacetum. 
833. T. vulgare L. Common, usually escaped from gardens. 
Artemisia. . 
831. A. caudata Michx. Common in sandy soil. 
835. A. canadensis Michx. " Rare, adventive. 
836. A. dracunculoides, Pursli. Plenty in dry soil. 
837. A. hiennis V/illd. Plenty on prairies. 
838. A. serrata Nutt. Scarce on prairies. 
839. A. longifolia lAutt. Plenty on prairie hillsides. 
840. A. gnaplialodes Nutt. Abundant on dry prairies. 
Erechtites. 
841. E. hieracifolia (L.) Raf. Plenty in woods and thickets. 
Mesadenia. 
842. M. tuherosa (Nutt.) Britton. Abundant in moist fields and 
meadows. 
Senecto. 
843. halsamitae Muhl. Plenty in sandy soil. 
844. S. aureus L. Common in sw'amps and fields. 
845. 8. palustris (L.) Hook. Rare in swamps and marshes. 
Arctium. 
846. A. lappa L. Abundant in woods and w^aste places. 
847. A. minus Schk. Rare in waste places. 
Carbuits. 
848. G. lanceolatus L. Abundant in fields and waste places. 
849. C. altissimus L. Plenty in wmods and fields. 
850. C. discolor (Muhl.) Nutt. Common in fields. 
851. C. arvenis (L.) Robs. Plenty in fields and waste places. 
852. C. ioense Pammel. Scarce on prairies. 
