45 



322. Heliotropium aiigustifolium Torr. Camp Cliailotte (Ixion comity). Our 



plants repmseiit tliis species iu every pai tieular except that tt.e corolla-lobes 

 are not "ovate and acute." The lobes are t!io.se of //. ieiidUm. M.ich oC the 

 "acuteuess" of the lobea of ^. angHsUJoiium is apparently the result of dry- 

 in J,'. 



323. Heliotropium coiifertifolium Torr. Koiiia (Htarr county). 



324. Heliotropium convolvulaceum Gray. Pena (Duval county). 



325. Heliotropium Curassavicum L. l',;c()s FlatK, near Pecos City (Pecos county). 



326. Heliotropium imuidatum Swartz. Hidal-o (liidalj^o county). 



327. Heliotropitmi tenellum Torr, Peiia (JJuval county). 



328. Kr^iiitzkia floribunda Gray. Linipia canon (Presidio county). 



329. Lithospermum Matamoreuse DC Brazos Santiafro. 



330. Ipomoea costellata Torr. Liuipia canon (Presidio county). 



331. Ipomoea Nealleyi Coulter, «. *j>. Glabrous, with slender creeping or twining 



stems: leaves thin, triangular in outline, cordate at base with a broad sinus, 

 augulately threo-lobed (the lateral lobes reseuiLtling the basal lobes of a 

 broadly hastate leaf, and often with an additional basal angle), 2 to IJ'-" long 

 and somewhat broatler, angles all mucronulate, on slender petioles: pedun" 

 clcH slender, usually a little shorter than the petioles, one-Howered : sepals 

 foliaceons, glabrous, loose, little if at all imbricated, linear-lanceolate, 

 acuminate, conspicnons, nearly or cinife as long aa the tube of the corolla, 

 ly to IB""" long, 8i)re;iding in fruit: corolla broadly funnelform, 15 to 20"'™ 

 long, with purfdish blue lobes and whitish tube: globose capsule glabrous.— 

 Chenate Mountains (Presidio couuty). Kelated to /. trifida Don. and its 

 allioe. 



332. IpomoB.-x sinuata Ortega. Pena (Duval county). Calyx shorter than usual. 



333. Ipomoea Texana Coulter, ». up. Apparently arborescent, glabrous, or minutely 



puberulent, with coarse blanches: leaves thickish, entire or nearly so, sagit- 

 tate, acuminate, the base with inconspicuous rounded lobes or truncate, 6 to 

 12<"' long, :!.,5 to ')-■" broad at base, on petioles 3.5 to T.O'^'" long: pednnelos 

 mostly shorter tlian the petioles, bearing simple or compound few to several- 

 llowered cymes : sepals short (6 or 7""'> long), somewhat coriaceous, minutely 

 pubescent, broad and rounded or two-lobed at apex: corolla piuk-i»urp]e, 

 pubescent, 5 to 7.5''" long.— Santa Maria (Cameron couuty.) A member of 

 the arborescent group of Ipoma^as, reiiresonted by the Mexican /. murucoides 

 R. & S., to which our plant is related. 



334. Convolvulus hermanuioides Gray. Santa Maria (Cameron county). 



335. Evolvulus alsiuoide.s L. Pena (Duval county) and Eoiiia (Starr couuty), 



336. Evolvulus sericeus Swartz. Pena (Duval county). Flowers 10 to 12""" in 



diameter. 



337. Dichoadra argentea Willd. Chenate Mountains (Presidio county). 



338. Cuscuta Califoniica Clioisy, var. reflexa Coulter, n. var. Flowers 1 to ,^>mm 



long when the lanceolate subulate corolla-lobes are erect, but these soon 

 sharply reflexed and as long as the tube: calyx-lobes acuminate, about 

 equaling the corolla tube: scales somewhat jirominent and lacerate: stylos 

 about as long as (he ovary : corolla marcescent around the two to four seeded 

 capsule.— Roma (Starr county), PritujU 783 (collection of 1886), from Chi- 

 huahua, seems also to be a form of this variable species. Our variety has 

 some important points of ditference from the species and any published varicr 

 ties, but it seems to be fnrly included in the same specific relationship. It' 

 this conclusion is right the range of this Californiau and Arizonian polymor- 

 phous species is extended through northern Mexico and into southern Texas. 



339. Solatium nigrum L. Brazos Santiago. A pubescent, rather small, and putire 



leaved form of this exceedingly polymor{)hou8 &}>ecies, 



24574— No, 'Z 3 



