Plante Lindheimeriane. 959 
292. UTRICULARIA prrsonata, Le Conte, DC. Not suffi- 
ciently distinguishable from U. cornuta. — Wet soil. April. 
293. Oxyparnus 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, J uly, August. 
Leaves on very short petioles. -Involucre 2-flowered. Stamens 
4-5, exserted. (Also collected in Texas, by Dr. Wright.) = 
294. Borrnavia pirrvsa, Willd. Roadsides and prairies; 
a common weed. September — October. - US 
:995. Rivina rogrTULACCorDzs, Nutt. in Trans, Amer. Phil. 
Soc. l: c. Woods and prairies, near Industry. June — Oc- 
tober. — A perennial herb, with a ligneous rhizoma. = =- 
7^ 996. Potyconum 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 thé 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. : Ie sakke 
| 991. Ergonom wvLTIFLORUM, Benth. Sandy prairies, near 
Industry. July — October. — The , stamens in the fertile 
.. "IS are very woolly towards the basées ^ `, : 
“298, aned LONGIFLORA (m. 8p.): radice filiformi 
- S12; caule humili adscendente ramoso; foliis longe 
wy US utrinque acutissimis subsessilibus glabris; floribus 
axillaribus pedunculatis basi unibracteatis extus pubescentibus, 
