Seed Plants, Ferns, Fern Allies of the Austin Region 11 



Hymenoclea monogyra T. & G. 

 Not common here. 

 West Texas, Mexico and southern California. 



Iva angustifolia Nutt. Marsh Elder. 

 Banks of Barton Creek. 

 Southern central states. 



Iva ciliata Willd. Marsh Elder. Rough Marsh Elder. 

 Banks of the river. 

 Southern central states. 



Xanthium speciosum Kearney. Cockle Bur. 



Very abundant in flood plains and waste places. 

 Central states. 



CARDUACEAE Thistle Family (Compositae) 



Tribe VERNONIEAE 



Vernonia Baldwinii Torr. Iron weed. 



In low open ground. Flood plains. A tall coarse weed with clus- 

 ters of red-purple flowers. 



Southern prairie states. 



Tribe EUPATORIEAE 



Coleosanthus cylindraceus Kuntze. (Brickellia cylindracea Gray & 

 Engelm.) 

 Mt. Bonnell. Onion Creek. In dry ground. 

 Texas. 



Conoclinum coelestinum DC. {Eupatorium coelestinum L.) Blue 

 Boneset. Mist Flower. 



Abundant in moist ground in ravines and valleys. Flowers light 

 blue. 



Widespread in southeastern and central states. 



Eupatorium ag eratif olium DC. Thorough wort. 



Common on bluffs and hillsides. Mt. Bonnell. A shrub with tri- 

 angular opposite leaves and white flowers. 



Texas and Mexico. 



EujMtorium ageratoides L. F. (Eupatroium urticae folium Reichard.) 

 Thoroughwort. White snakeroot. 

 Common in moist ravines. Similar in appearance to the preceding. 

 Eastern states and Canada. 



