714 



/ 



Bausteine 



zu einer 



Monographie der Convolvulaceen 



Hans HALLIER 



(Fortsetzung zu Band V, S. 1021-1052.) 



7. Rivea (sect. Moorcroftia) luzonensis sp. n. 



(Hierzu Tafel XIX.) 



Frutex volubilis, Riveae glabrae m. (Argyreiœ Choisy) arcte affinis; 

 rami elongati, lignescentes, teretes, exsiccando rugosi, pilis raris 

 minutis appressis aspersi, nitiduli; foliorum petiolus longus, sicut 

 pedunculi et laminse nervi subtus parce appresse setulosus, lamina 

 magna, latius angustiusve ovato-subcordata, brevius longiusve acuminata, 

 herbacea, triste viridis vel nigricans, opaca, supra glaberrima, concolor, 

 subtus pallidior, nervis venisque saturatius coloratis reliculata, subcla- 

 thrato-venosa, nervis laleralibus utrinsecus ca. 7 procurvis intra mar- 

 ginem arcuatim conjunctis, inferioribus binis vel ternis fere una e petiolo 

 nascentibus; pedunculi axillares, supra gemmulas singulas dense flavo- 

 setulosas solitarii, longissimi, folia plerumque adsequantes vel supe- 

 rantes, tenuiusculi, leniter curvati, teretes, apice umbellatim 4-6-fidi, 

 corymbo densiusculo multifloro terminati; cujusvis ramibractea usque 

 ad infimam dichotomiam elevata, decidua; bracteolas parvae, sepalis 

 minores, ovatse, sicut pedicelli et sepala dense appresse flavo-pubescentes, 



