OF ARTS AND SCIENCES. 439 



CoRDiA CANA, Mart. & Gal., ex Walp. Rep. 6. 554, but less ca- 

 nescent. A small straight tree, 8 feet high, with rouudish top. Bar- 

 ranca. (84.) 



Heliotropium limbatum, Benth. PI. Hartw. 20. Certainly the 

 species of Hai-tweg's collection, but with finer and closer pubescence. 

 Rio Blanco, on damp hillsides ; June. (52.) 



Heliotropium inundatum, Swartz. Very narrow-leaved. Gua- 

 dalajara, in moist bottoms ; July. (258.) 



Onosmodium strigosum, Don. Rio Blanco, in shady ravines ; 

 July. (173.) 



Ipomoea stans, Cav. Rio Blanco ; August. (324.) — " Espanti- 

 lobo" ; a decoction of the root is used for fever and ague. 



Ipojicea longepedunculata, Hemsl. Biol. Centr.-Am. Bot. 2. 

 389. (^Pharbitis longepedunculata, Mart. & Gal., by the character, 

 but not a Pharbitis.) Rio Blanco ; August. (335.) — " Running 

 over grass, rocks, and low plants ; the root an oblong tuber ; corolla 

 pink, the tube white." The same as Bourgeau's 495, from Pedregal. 

 I. Hartwegi, Benth., is a related species. 



Ipomcea l^ta. Gray, n. sp. Euipomcea, hispidulo-pubescens ; 

 caulibus e caudice crasso ligneo humifusis parumque volubilis ; fuliis 

 (sesqui-bipollicaribus) pube utriuque strigilloso profunde trifldis, seg- 

 mentis lateralibus bilobis, medio e basi contracta ovato ; pedunculis 

 unifloris folium superantibus apice bibracteato unifloris ; pedicello 

 bracteis lanceolatis a?quilongis sepalis extus patenti-hispidis ovatis 

 obtusiusculis (exterioribus subpollicaribus) dimidio brevioribus ; corolla 

 extus in alabastro pilis longis barbata, tubo per authesin cylindraceo 

 bipoUicari fere albo, limbo amplo (poll. 4 lato) violaceo-purpureo ; 

 capsula parvula quadrivalvi glabra ; seminibus subglobosis glabris lin. 

 3 latis. — Rio Blanco, " running among grass and over low plants, 

 very showy"; August. (341.) This fine species may have some 

 name already, but it cannot be I. superba. The fiower in form and 

 pubescence is much like that of /. Maireti (which abounds at Orizaba), 

 but foliage, pubescence, and habit are quite different. 



Ipomcea purga, Wender. Tequila, in ravines. (373.) 



Ipomcea rhodocalyx, Gray, n. sp. Inter Calonydion et Euipo- 

 mceam, glaberriraa ; caule alte scandente pedicellisque omnino la3vibus 

 (nee muricatis); foliis cordatis seu oblongo-cordatis iutegerrimis mem- 

 branaceis (majoribus 4-2iollicaribus cum petiolo 2|-pollicari) ; pedun- 

 culis folium subaequantibus 1-2-floris ; calyce in alabastro subvesicario 

 ovato rubente, fructifero pollicari pedicello clavato-incrassato paullo 

 breviore, sepalis ovatis acutiusculis pergamentaceis vel interioribus 



