MTl. D. HANBUUY ON A SPECIES OP TPO"M(EA.. 281 



my correspondent sent some pressed and dried specimens from 

 Guanajuato, which corresponded perfectly with tlie growing plant. 

 Having ascertained, from the study of these materials, that the 

 plant belonged to the genus Ipomoea^ I endeavoured to identify it 

 with some species described in the ' Prodromus ' of De Candolle, or 

 in the subsequently published ' Annales ' of Walpers, but without 

 success. Neither wms I able to find any corresponding specimeji 

 in the herbaria of the British Museum or of the Royal Gardens of 



Kew. In the Paris Museum there is a plant, collected by Galeotti 

 on the lofty Cordillera near Oaxaca, whicl), so far as a scanty 

 specimen enables me to judge, accords precisely with that received 

 from Mr. Pinck. It bears a number which is not mentioned in 

 the enumeration, by Martens, of Galeotti's Convohulacece (con- 

 tained in the ' Bulletin de I'Academie Eoyale de Bruxelles' *); and I 

 therefore conclude that it is unnamed. Under these circum- 

 stances, I have drawn up the following diagnosis and description 

 of the plant, w^hich I propose to call Ipomosa simidans. The spe- 

 cific name is chosen in allusion to the remarkable similarity which 

 the plant bears in foliage and habit to the true jalap (Ipomoea 

 Purffa, Hayne), not to mention the resemblance of its tubercules. 

 The funnel-shaped corolla and pendent flower-buds of the Tampico 

 jalap.plant are quite unlike the corresponding parts of I. Fur^a, 

 and furnish a ready means of distinguishing the two species : — 



IpOMCEA siMULANS,sp. nov. Radicc tuberosa, caule volubili herbaceo 

 glabro, fohis ovatis, acuminatis, cordatis v. sagittatis, indivisis, j)edun- 

 cuhs unifloris solitariis, sepalis parvis. 



Hub. in Andihus Mexicanis Sierra Gorda dictis, prov. Guanajuato (fide 

 cl. Finck); in regione frigida ad ped. 8000 prope Oaxaca {H. Gale- 

 otti, no. 13691). 



Radix napiformis v. subglobosa v. elongata, carnosa, 2-3 poll, longa, 

 basi fibrillosa. Caules herbacei, graciles. Folia glaberrima, 2-4-pol- 

 licaria, 1-2 poll, lata, lobis baseos acutis v. rotundatis v. subtruacatis, 

 petiole tenui, l^-2i-pollicari. PeduncuU axillares, petiolum subae- 

 quantes, penduli, uniflori v. in planta vegetiore novelli alabrastra duo 

 ferentes, altero semper (ut videtur) abortiv o. Pedicelli incrassati, basi 

 bracteis 2 minutis. Sepala ovata, obtusa, exteriora paullulum breviora. 

 Corolla infundibuliformis, l|-2 polL longa, glabra, rosea, pallide 

 striata. Stigma bilobum. Capsula calycem superans, conica, 2-locu- 

 laris, valvis 4 coriaceis. Semina glabra. 



Tab, IL fig. 1, Calyx and pistil; 2, Ovary ; 3, Mature cai^sule : all fnagnifieJ, 



♦ Tome xii. pt. 2 (IJ«45}, p. 257. 



