OO NEW AFRICAN CONVOLVULACEiE. 



feram ssepe transit, quamquam facile pro specie autonoma censeri 

 potest. Supra rupem ad Souffriere (n. 146) et Bath Estate (n. 141) 

 in Dominica et ad Baleine Falls (n. 295), Lomond Bay et Fort 

 Charlotte (u. 287) in St. Vincent. — Pycnoconidiis cum f. <jraniilij'era 

 congruit. 



(To be continued.) 



NEW AFRICAN CONVOLVULACE^. 

 By a. B. Rendle, M.A., F.L.S. 



Ipomoea marmorata Britten & Rendle, sp. n, Caule lignoso 

 striato glabro, foliis magnis petiolatis reniformibus vel a basi reni- 

 forme suborbicularibns, margine crispulata apice rotundo vel retuso, 

 facie superiore sparse inferiore in venis venulisque dense albo- 

 tomentosa ; pedunculis brevibus unifloris, floribus magnis, brevius 

 pedicellatis ; sepalis magnis late ovato-oblongis, crassiusculis, glabris, 

 obtusis, rarius retusis ; corolla longe tubulosa superne ampliata, 

 glabra ; antheris et stigmate subgloboso baud exsertis. 



Hab. Lake Stephanie, Donaldson Smith, May 26, 1895. Herb. 

 Mus. Brit. 



A striking plant, characterised by its long tubular flowers and 

 large broad leaves, to which the broad protruding tomentose veins 

 give a marbled appearance on the under surface. The petioles are 

 equal to or rather shorter than the length of the blade. The oldest 

 and largest leaf is reniform, with a refuse apex, 2| in. long and 

 5 in. broad; the three following are 2i-2 in. long by 3-2J broad, 

 and are rounded above. The short strong peduncle (^ in.) bears a 

 single flower and two lateral alternate bract- scars, the axils of 

 which contain the remains of a bud. The short stout pedicel is 

 8 lines long. The inner sepals are 1 in. by 8 lines, the two outer 

 slightly shorter. The corolla is 5 in. long, and of uniform diameter 

 {\ in.) for about 3J in. ; in the already withering flower the 

 stamens and stigma reach to about this level. 



Is very near the South African 7. alhivenia Don, the leaves of 

 which are similar in shape, and show the striking marbled appear- 

 ance of the lower surface due to the broad densely tomentose veins 

 and veinlets ; it is, however, at once distinguished by its very large 

 calyx, twice the size of that of /. albivmia :' the corolla is also 

 larger, but in less proportion than the calyx. The same distinction 

 separates it from 7. lapidosa Vatke (e descript. in Linnmi, 43, p. 507), 

 an East Tropical African species, in which moreover the leaves are 

 longer than broad. /. Wakefteldii Baker {Kew Bulletin, 1894, p. 74), 

 from the Nyika Country, is also closely allied, but the leaves are 

 thinner and tomentose only when young ; while the calyx is again 

 only about half as large as in /. marmorata, and not glabrous. 



Ipomoea dammarana, sp. n. Erecta, albo-tomentosa, caule 

 rigido lignoso ; foliis mediocribus ovato-orbicularibus, facie inferiore 

 et petiolis velut caule et pedunculis dense, facie superiore sparsius 



