Plants Lindheimeriance. 217 



what hairy and often incurved, (ffi. bifrons, Don, has 

 rounded petals.) Galveston to the Brazos. June, July. 



57. Ludwigia hirtella, Raf. ; Torr. &f Gr. I. c. Houston. 



58. L. linearis, var. puberula : caule ramosissimo angu- 

 lato foliisque junioribus minutim puberulis ; lobis calycis tri- 

 angulari-lanceolatis acuminatis tubum sequantibus capsula 

 elongato-turbinata subpedicillata dimidio brevioribus ; petalis 

 flavis conspicuis. — Prairies and road-sides, Houston. June, 

 September. Also in Alabama, Louisiana, &c. ; these char- 

 acters gradually shading away into the ordinary L. linearis, 

 in its branching forms, so that we cannot consider it as a dis- 

 tinct species. 



59. JuSSIiEA DECURRENS, DC. Houston, &C. 



60. Gaura sinuata, Nutt. Steep river-banks, &c, west 

 of the Brazos. August. 



61. Gaura Lindheimeri (n. sp.) : perennis, erecta, vir- 

 gato-ramosa, strigoso-pubescens vel hirsuta ; foliis infimis 

 spathulatis lyrato-pinnatifidis sinuatisve, caulinis sessilibus lan- 

 ceolatis acutis sinuato-dentatis vel undulatis, supremis plerum- 

 que integris ; bracteis ovato-lanceolatis acuminatis scariosis 

 caducis ; calycis tubo ovarium sessile aequante segmentis (in 

 alabastro hirsutis) multo breviore ; petalis 4 spathulato-rhom- 

 boideis breviter unguiculatis subadscendentibus staminibus 8 

 styloque deflexis paulo brevioribus ; nuce tetraquetra circum- 

 scriptione ovali utrinque acuta, faciebus usque ad medium 

 carinato-costatis fere laevigatis. — Prairies from Houston to the 

 Brazos, flowering from April to May, and through the summer. 

 In the botanic garden of Harvard University, where it is cul- 

 tivated from seeds collected by Mr. Lindheimer, it also flowers 

 through the whole summer, and proves to be a very showy 

 and elegant species. It attains the height of from 3 to 6 feet, 

 and its copious racemose branches produce a long succession 

 of blossoms which are of a large size for this genus. The 

 petals, which are often three-fourths of an inch long, are pure 

 white changing to rose color ; the calyx is reddish. Flowers 

 always tetramerous and octandrous. This is probably the 



vol. v. 15 



