Seed Plants, Ferns, Fern Allies of the Austin Region 85 



Tetraneuris lineari folia Green. (Actinella linearifolia Torr. & Gray.) 

 Similar to T. linearis, but annual. Less abundant. 

 Southern central states. 



Tetraneuris linearis Green. {Actinella scaposa var. linearis Nutt.) 

 Abundant in dry, open places and stony hillsides. Campus. A 



rosette of narrow, basal leaves and conspicuous yellow heads borne 



on a long, slender, leafless stem. 

 Texas and New Mexico. 



Thymophylla pentachdeta Small. (Hymenantherum pentachaetum 

 DC.) 

 Hills of the Edwards Plateau. Not common here. 

 Southern plains states and Mexico. 



Tribe ANTHEMIDEAE 



Anthemis Cotula L. Mayweed. Dog's Camomile. Dog Fennel. 

 Along the railroad track. 

 Widespread in North America. Introduced from Europe. 



Achillea millefolium L. Yarrow. 



Dry, open places. Common. A strong-scented weed with very 

 finely divided leaves and dense, flat-topped clusters of white heads. 



Introduced from Europe and Asia and widespread in North Amer- 

 ica. Very common in the eastern states. 



Artemisia mexicana Willd. 



Open, dry ground. Not very common here. 

 Southern plains states and Mexico. 



Tribe SENECIONEAE 



Mesadenia tuberosa Britton. (Cacalia tuberosa Nutt.) Indian Plan- 

 tain. 

 Flood plain of Bull Creek. 

 Prairie states. 



Senecio ampullaceus Hook. Squaw-weed. 



Abundant in the river flood plain. A tall, coarse weed with large, 

 white-wooly leaves and yellow heads. 



Texas. 



Senecio lobatus Pers. 

 Valleys and flood plains. 

 Southeastern states to Mexico. 



