Seed Plants, Ferns, Fern Allies of the Austin Region 41 



GERANIALES 



GERANIACEAE Geranium Family 



Erodium cicutarium L'Her. Pin Clover. Alfilaria. 

 Waste ground and open woods. 

 Introduced from Europe and widespread in Eastern North America. 



Erodium texanum A. Gray. Wild Geranium. Stork's Bill. 



Very abundant in waste places, roadsides and barren, dry hillsides, 

 carpeting the ground in many places. 



Texas to California. 



Geranium texanum Heller. Wild Geranium. Crane's Bill. 



Abundant in woods and ravines. 



Southern Texas. Very closely related to G. caroliniana of the 

 Atlantic and Gulf States. 



LINACEAE Flax Family 



Cathartolinum multicaule Hook. Flax. 

 Common in dry open ground. 

 Texas plains and prairies. 



Cathartolinum rigidum Pursh. Flax. 

 Dry soil. 

 Prairie and plains states to Mexico. 



Cathartolinum rupestre Engelm. Flax. 

 Dry soil. 

 Texas and Mexico. Plains and prairies. 



OXALIDACEAE Wood-Sorrel Family 



Ionoxalis Drummondii Rose (/. vespertitionis in the old edition of 

 Small). (Oxalis vespertilionis T. & G.) Violet Wood Sorrel. 



It differs from Xanthoxalis in its large violet flowers and large, 

 deeply lobed leaflets. Ravines or hillsides, rich or barren soil. 



Texas to Arizona. 



Xanthoxalis corniculata Small. (Oxalis corniculata L.) Yellow 

 Wood Sorrel. Sour Grass. 



Very common in waste and cultivated ground, lawns and roadsides. 

 Well known by its trifoliate leaves and acid juice. 



Southeastern states. 



