178 UNITED STATES AXD MEXICAN BOUNDARY. 



pedicellis capillaribiis valvas fequantibus ; valvis lato-cordatis membranaceis integerrimis 

 ecallosis. Sandy soils from El Paso to the canons of the Kio Grande ; March — April. Eoot 

 white. Stem 2-3 feet high. ** Foliage intensely hitter ;" Thurher. Lower leaves a foot or 

 more long and 2-3 inches wide, somewhat nndiilate on the margin ; upper ones nearly flat. 

 Panicle a foot long ; the flowers crowded. Inner sepals of the fructiferous calyx nearly half an 

 inch long; roundish-ovate, strongly cordate, of a very thin texture, often rose-colored, slightly 

 reticulate-veined, twice as long as the achenium. We cannot refer Kumex to any described 

 species. It is nearest K. venosus, hut that is a smaller plant, the leaves with a much longer 

 and more attenuated base, the panicle lax, and with but few flowers in whorls, and the valves 

 are a great deal larger, as well as broader in proportion. 



RuMEx SALiciFOLiuSj Weinni. in Flora^ 1821, ex Meisn. in DC. Prodr. 14,^ar,9 1, p. 4Y. Banks 

 of the Eio Grande near Frontera, Texas ; April. (No. 1780 and 1781, Wright.) 



Yar. BENTicuLATius : valvulis lato- deltoid eis denticulato-serrulatis vix callosis. Near San 

 Diego, California ; TTiurher. Probably a distinct species. 



MARiTiMUS, Linn. ; Meisn. h c. p. 59. Moist sandy places near San Luis Key, Calfornia ? 

 Farry, 



Polygonum aviculaee, Linn. Sp. p. 519; Meisn. I. c. ^.97. Western Texas ; Wright^ No. 

 1774 and 1775 ; the latter a tall erect slender form with narrowly lanceolate leaves. 



Polygonum Paronychia, Oham. <& ScJdecht. in Linncea, 3, p. 51, Meisn. I. e. p. 89. Near 

 Monterey, California ; on the sea beach, April ; Parry. San Francisco, March ; Thurher. 



Polygonum camporum, y boreale, Meisn. in Mart. Ft. Bras. fasc. 14, Folyg. 2^- 22 ; & in 



DC. Frodr 



Willow 



Mouth 



of Los Moros ; Schott. (No. 614, Wright.) Stems 3-4 feet long, simple below, apparently 



m 



terminating in long slender 



interrupted spikes ; bracts 2-4-flowered, the lower ones remote and sometimes with small 

 oblong leaves in the axils, the upper somewhat approximated. Plowers on exserted pedicels. 

 Perianth pale rose color or white, not punctate. Achenium tric[uetrous.^ — Allied to P. scoparium 

 of Corsica. 



Polygonum tenue, Michx. FL 1, p. 238 ; Torr. Fl. N. TorJc, 2, p. 153. Hill sides, Santa 

 Eita del Cobra, Aug.; Bigeloiv. (No. 1776, Wright.) 



Polygonum acre, H, B. K,; 3Ieisn. L c. p. 107. P. hydropiperoides, Pnrsh, non Michx 

 Between El Paso and Dona Ana, on the Rio Grande, April ; also on the Mimbres ; Bigeloiv 



(No. 1777, Wright.) 



Polygonum HYDROPiPERomES, Michx. Fl. 1; i>. 239; Meisn. I. c. p. 103. Brady's Creek, 

 western Texas, October ; Thurher. 



Polygonum nodosum, Pers. var. incaknatum, Gray, Dot. N. States, ed. 2, p. 372. P. incarnatum, 



FU. With the h 

 Texas ; Thurher. 



San 



Wester 



Polygonum Pennsylvanicum, Linn. Sp. 1,^. 519 ; Meisn. I. c. Low grounds near San Elceario 



Texas ; Bigeloiv. Sonora ; Thurbery Copt. E. K. Smith. 



Polygonum Persicaeia, Linn.; Meisn. I. c. Wet places ; Valley of the Limpio^ etc. 

 Polygonum amphieium, Linn. ; Meisn. I. c, Var. terrestre. Presidio del Norte ; Bigeloio 



(a nearly glabrous form.) Santa Cruz river, Sonora ; Capf. E. K. Smith. (No. 1779, Wright. 



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