80 



Rather plentiful in rich, shaded ground about Kerrville, climbing over 

 bushes and small trees. 



April 24 (1644); type locality, "mountain ravine near Live Oak " 



.CONVOLVULACEAE. 



IPOMOEA L. Sp. PL 1 60 (1753). 

 Ipomoea Lindheimeri A. Gray. Syn. Fl. 2: 210 (1878). 



Ipomoea heterophylla Torr. Mex. Bound. Surv. 2 : 149 (1859), not 



Ortega. 



On stony limestone ridges northeast of Kerrville, altitude, 1900 feet. 

 Twining over bushes. Corolla light blue, but turning pink when dry. 

 May 21 (1776) ; type locality, west Texas. 



CONVOLVULUS L. Sp. PL 153 (1753)- 

 Convolvulus incanus Vahl. Symb. Bot. 3 : 23 (1794). 

 In dry, open ground about Kerrville, altitude 1650-1750 feet. 

 June 23 (1910); range, Arkansas to Texas and Arizona. 



EVOLVULUS L. Sp. PL Ed. 2, 391 (1762). 



Evolvulus Nuttallianus R. & S. Syst. 6: 198 (1820). 

 Evolvulus pilosus Nutt. Gen. i : 174 (1818), not Roxb. 

 Evolvulus argenteus Pursh, FL Am. Sept. 187 (1814), not R. Br. 



In dry, bare places about Kerrville, altitude 1650-1800 feet. Corolla 

 pale purple. 



June 23 (1912); type locality, " confluence of the Rapid river and 

 the Missouri." 

 Evolvulus sericeus Swartz, Prodr. FL Ind. Occ. 55 (1783-87). 



In sandy ground at sea level about Corpus Christi. Flowers white. 



March 12 (1441); type locality, Jamaica. 



CRESSA L. Sp. PL 223 (1753). 



(PLATE 5.) 



Cressa aphylla n. sp. 



From an apparently perennial root; low, about six inches high, slender, dif- 

 fusely branched from the base ; whole plant covered with scales and 

 appressed hairs ; leafless, each branch subtended by an ovate, acute 

 or acutish bract or scale, smaller ones scattered along the naked 

 branches and at the base of each flowering pedicel ; flowers on very 

 short pedicels ; calyx bibracteolate, the bracts appressed, lanceolate 



