34 University of Texas Bulletin 



ROSALES 



SEDACEAE (CRASSULACEAE) Orpine Family 



Sedum Nuttalianum Ref. Stonecrop. 



Very abundant on level rock uplands of the Edwards Plateau and 

 in dry gravelly soil of the postoak woodlands. A small succulent 

 annual, rooting in very shallow soil and disappearing during the 

 dry season. When in bloom its yellow flowers form a conspicuous 

 covering in shallow depressions in the rocks. 

 South central states. 



Sedum pulchellum Michx. Stonecrop. Rock Moss. 



Hilltops of the Edwards Plateau region. A little larger than the 

 preceding and with white flowers. Rather rare. 



Southeastern states. 



Tilleastrum Drummondii Britton (Tillaea Drummondii T. & G.) 



Common on shallow pools and mud holes of the postoak woods. 

 Disappearing in the dry season. A minute plant with reddish suc- 

 culent stems. 



Western states and Mexico. 



SAXIFRAGACEAE Saxifrage Family 



Lepuropetalon spathulatum Ell. 



In compact wet soil of the postoak woods. Disappearing in the 

 dry season. A very tiny, short-stemmed plant with yellowish blos- 

 soms. 



Southeastern states and Mexico. 



PLATANACEAE Plane-tree Family 



Platanus occidentalis L. Sycamore. 



A familiar shade tree. Growing wild along streams. 

 Widespread in eastern North America. 



ROSACEAE Rose Family 



Geum canadense Gmel. Avens. 



In moist, rich soil. Shaded bluffs Onion Creek. 

 Northeastern states. 



Geum Virginianiim L. Avens. 



Moist woods north of the Seminary. 

 Eastern states and Canada. 



Rubus trivialis Michx. Dewberry. 



Abundant in waste ground, along railroad tracks and roadsides. 

 Southeastern states. 



