20 University of Texas Bulletin 



Sisyrinchium pruinosum Bicknell. Blue-eyed Grass. 



A tufted, grass-like plant. The deep blue flowers have yellow 

 centers. 



Abundant in meadows and roadsides. 



A plant of the north Texas prairies. 



Sisyrinchium minus Engelm. and Gray. 



In low places along railroad tracks and roadsides where the soil 

 is fine and compact. A low form with small reddish flowers. 



Characteristic of low moist prairies of east Texas and Louisiana. 



Sisyrinchium, other species, not certainly identified. 



ORCHIDALES 



ORCHIDACEAE Orchid Family 



Ibidium (Spiranthes, gyrostachys) . Ladies' Tresses. 

 Hillsides of the Edwards Plateau. 

 Flowers small, white, in racemes about four inches high. 



DICOTYLEDONS 



JUGLANDALES 



JUGLANDACEAE Walnut Family 



Hicoria Pecan Britton. Pecan. 



On the river flood plain and in most valleys. Abundant along 

 Walnut Creek. 



Southern-central states and introduced eastward. 



Juglans nigra L. Black Walnut. 



A large tree with a fruit an inch or more in diameter. 



River flood plain and deep ravines. Abundant along Walnut Creek. 



Widespread in the eastern and central forest regions of the United 

 States. 



Juglans rupestris L. Mexican Walnut. , , 



Small trees. Ravines of the Edwards Plateau. The nut is about 



1 cm. in diameter. 



Texas, New Mexico and Mexico. Common along streams in the arid 



mountain regions of West Texas. 



