Plante Lindheimeriane. 51 
292. Urricutarta personaTa, Le Conte, DC. Not suffi- 
eiently distinguishable from U. cornuta. — Wet soil. April. 
293. OxypapHus 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, Borruavia pirrusa, Willd. Roadsides and prairies ; 
a common weed. September — October. 
295. Rivina porruuaccoiwes, Nutt.in Trans, Amer. Phil. 
Soc. l. c. Woods and prairies, near Industry. June — Oc- 
tober. — A perennial herb, with a ligneous rhizoma. 
296. Po_yconum 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 
fructiferig 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. Ericonum muLtirtorum, Benth. Sandy prairies, near 
Industry. July — October.— The stamens in the fertile 
flowers are very woolly towards the base. 
298. ArIsroLocHIA LONGIFLORA (n. sp.): radice filiformi 
elongata; caule humili adscendente ramoso; foliis longe 
linearibus utrinque acutissimis subsessilibus glabris; floribus 
axillaribus pedunculatis basi unibracteatis extus pubescentibus, 
