Plantcs Lindheimeriance. 159 



floribus flavis (pi. submasc. subfoem. fruct.) Rocky soil and 

 high prairies, New Braunfels. July. Plant from two to 

 five feet high. 



346. R. Toxicodendron, Linn. ; Torr. &f Gr. Fl. I. p. 218. 

 Thickets and stony prairies, New Braunfels. May, in flower: 

 September, in fruit. "Erect, not climbing." — This is the 

 Rhus verrucosa, Scheelc in Linncea 21, p. 592, which is com- 

 pared only with R. aromatica ! The " Verrucas magnse sub- 

 rotundas atropurpurea) lucidce," of the lower surface of the 

 leaves, which suggested the name, are merely exudations of 

 resinous juice caused by the puncture of insects on some 

 leaves only, as Dr. Engelmann has pointed out. 



f R. Toxicodendron, Linn. var. foliis ramulisque molliter 

 pubentibus. Thickets, New Braunfels. 



347. R. (Lobadium) trilobata, Nutt. in Torr. fy Gray, 

 Fl. 1, p. 219. Rocky soil, margin of high prairies, New 

 Braunfels ; March (in flower) ; June (in fruit). A slender, 

 much branched shrub, two to five feet high. 



348. R. virens (Lindhcimer, Mss.) : glabella ; foliis sem- 

 pervirentibus 3-4-jugis cum impari, rachide nuda ; foliolis 

 ovatis oblongisve obtusis v. obtusiuscule acuminatis margine 

 subrevolutis integerrimis coriaceis supra nitidis subtus pallidis 

 sub lente minutim tomentulosis ; floribus albidis thyrsoideo- 

 paniculatis ; paniculis axillaribus folio brevioribus ; drupa 

 rubra hirsuta, putamine lenticulari laevi. — Rocky soil, in open 

 places, in Cedar woods, New Braunfels, &c. March ; in 

 fruit, August. Mr. Wright sends the same species from 

 Western Texas ; and Dr. Coulter collected it at Zimapan, 

 Mexico. A well marked species, of the section Sumac. 

 Leaflets an inch or rather more in length, smooth, except 

 under a lens, soft to the touch, shining above, thick and 

 rigidly coriaceous. 



MALVACEAE. 



f Calltrrhoe involucrata, Gray, PL Fendl. p. 14, & 

 Gen. 111. 2, p. 53, t. 117. Malva involucrata, Torr. fy Gray, 

 Fl. 1, p. 226. Oak openings, on the Pierdenales. June. 



