Seed Plants, Ferns, Fern Allies of the Austin Region 55 



Megapterium Missouriense Spach. 



Common on dry hillsides of the Edwards Plateau. With very large 

 yellow flowers and winged pods. 



Southern plains and prairie states. 



Meriolix melanoglottis Rydb. Primrose. 



Similar to the following species, but with the inside of the cup 

 and the stigma black. Occasional in dry soil. 



Colorado to Texas. 



Meriolix serrulata Walp. 

 Roadsides, etc. 

 Plains and prairie states. 



Meriolix spinulosa Heller. (Oenothera serrulata T. & G.) 



Abundant on roadsides and hillsides and along railroad tracks. 

 Very similar to the preceding but with larger flowers. The flowers 

 of both are yellow and the leaves slender and toothed. 

 Southern plains and prairie states. 



Oenothera laciniata Hill. (Oenothera sinuata L.) Evening Primrose. 

 Dry ground, roadsides and along railroads. Flowers yellow. 

 Eastern and central states, Mexico and South America. 



Oenothera laciniata grandis Britton. (O. sinuxta var. grandiflora 

 Heller.) Evening Primrose. 



Common on the river flood plain. Similar to the preceding but 

 with large flowers. 



Southern-central states. 



Onagra Jamesii Small. (Oenothera Jamesii T. & G.) Evening Prim- 

 rose. 

 On the bank of Barton Creek. Very large yellow flower. 

 Southern plains states. 



GUNNERACEAE (HALORAGIDACEAE) Water Milfoil Family 



Myriophyllum heterophyllum Michx. Water Milfoil. 



Barton Creek. Growing submerged similar to Ceratophyllum, but 

 less branched, and with softer, pinnately divided leaves. 



Widely distributed in eastern North America. 



Myriophyllum proserpinacoides Gill. (Not in Small.) Parrots Feather. 

 Found in Shoal Creek. Escaped from cultivation. 

 Native of Chile and widely cultivated in acquaria. 



