SUB-CLASS II. DICOTYLEDONES. 211 
Artemisia gnaphalodes Nutt. (A. ludoviciana Nutt., in part.) 
In dry soils. (Fitzpatrick.) 
Erechtites hieracifolia (L.) Raf. Fire-weed. Common in 
waste places and clearings. Hesper, north fork of Bear creek. 
Mesadenia reniformis (Muhl.) Raf. (Cacalia reniformis 
Muhl.) Great Indian Plantain. Quite common, in woods. De- 
corah, Bluffton, Canoe creek. 
Mesadenia tuberosa (Nutt.) Britt. (Cacalia tuberosa Nutt.) 
Tuberous Indian Plantain. In moist places. Not common. 
Ft. Atkinson. 
Mesadenia atriplicifolia (L.) Raf. (Cacalia atriplicifolia L.) 
Pale Indian Plantain. In rich soil. Rare. Calmar. 
Synosma suaveolens (L.) Raf. (Cacalia suaveolens L.) In 
rich woods. Rare. Ft. Atkinson. 
Senecio aureus L. Swamp Squaw-weed. In bogs. Not rare. 
Hesper. 
Senecio balsamitae Muhl. (S. aureus var. balsamitae T. & G.) 
Balsam Groundsel. In dry places. Bluffton, ete. 
Arctium lappa L. Great Burdock. Introduced weed. Cal- 
mar. 
Arctium minus Schk. (A. lappa var. minus Gray.) Common 
Burdock. Common introduced weed. Decorah, etc. 
Carduus lanceolatus L. (Cnicus lanceolatus Hoffm.) Common 
Field Thistle. Introduced weed. Common. Ft. Atkinson, etc. 
Carduus altissimus L. (Cnicus altissimus Willd.) Tall This- 
tle. Common in thickets, ete. Canoe creek, Kendallville. 
Carduus discolor (Muhl.) Nutt. (Cnicus altissimus var. dis- ‘ 
color Gray.) Field Thistle. Common along borders, ete. De- 
corah, Ft. Atkinson. 
Carduus iowensis Pammel. (Cnicus altissimus Willd., in 
part.) Jowa Thistle. Along borders and in thickets. Notcom- | 
mon. Hesper. 
Carduus hilli (Canby) Porter. (Not given in Gray.) Hill’s 
Thistle. On rich prairies. Not common. Calmar. 
Carduus muticus (Michx.) Pers. (Cnicus muticus Pursh.) 
Swamp Thistle. Common in bogs near Hesper. 
Carduus arvensis (L.) Robs. (Cnicus arvensis Hoffm.) An 
introduced weed. Fortunately not common. Ft. Atkinson. 
