Plantce Lindheimeriance. 259 



292. Utricularia personata, Le Conte, DC. Not suffi- 

 ciently distinguishable from U. cornuta. — Wet soil. April. 



293. Oxybaphus pilosa ? == Alliona ovata, Pursh. Caly- 

 menia pilosa, Nutt. — Both bad names, as the stem and 

 leaves are sometimes nearly glabrous, and the leaves are mostly 

 oblong-lanceolate. Prairies west of the Brazos. July, August. 

 Leaves on very short petioles. Involucre 2-flowered. Stamens 

 4-5, exserted. (Also collected in Texas, by Dr. Wright.) 



294. Boerhavia diffusa, Tlilld. Roadsides and prairies ; 

 a common weed. September — October. 



295. Rivina portulaccoides, Nutt. in Trans, Amer. Phil. 

 Soc. I. c. Woods and prairies, near Industry. June — Oc- 

 tober. — A perennial herb, with a ligneous rhizoma. 



296. Polygonum cristatum (n. sp.) : caule herbaceo volu- 

 bili angulato-striato ; foliis e basi subcordata vel truncata 

 triangularibus acuminatis margine scabris ; floribus in axillis 

 foliorum glomeratis seu in spicas foliaceas laxe dispositis ; 

 floribus octandris ; stigmatibus 3 sessilibus ; laciniis perigonii 

 fructiferis tria exterioribus cristato-alatis, alis crenato-incisis ; 

 nucibus parvis trigonis nitidis. — Margin of woods, &c. near 

 Industry. July. Near Polygonum scandens and P. dume- 

 torum, from which it is distinguished by its less cordate and 

 more triangular leaves, and the crenately incised wings of the 

 three outer sepals, in fruit ; and also by the smaller nuts, 

 which are just one line in length. In P. scandens the nuts 

 are more than a line and a half, in P. dumetorum fully two 

 lines long. In the latter the broad wings are undulate and 

 entire. In P. scandens they are somewhat crenate, but often 

 one or all three are wanting. In P. Convolvulus the wings 

 are wanting, and the nuts are opaque. 



297. Erigonum multiflorum, Benth. Sandy prairies, near 

 Industry. July — October. — The stamens in the fertile 

 flowers are very woolly towards the base. 



298. Aristolochia longiflora (n. sp.~) : radice filiformi 

 elongata ; caule humili adscendente ramoso ; foliis longe 

 linearibus utrinque acutissimis subsessilibus glabris ; floribus 

 axillaribus pedunculatis basi unibracteatis extus pubescentibus, 



