148 cxiii. PiPERACE^ (baker AND wrigut). [Pepefomia. 



climbing. Leaves exstipulate, alternate, opposite or verticillate, entire, 

 penniveined or triplinerved. Spikes terminal or leaf-opposed, solitary 

 or several together ; bracts sessile, usually peltate. 



Species about 4<)0, spread through the warmer reg:ions of both hemispheres, 

 concentrated in America. 



Leaves alternate. 



Stems erect from the base. 

 Leaves cnneate at tlie base 

 Leaves shortly cordate at the base. 

 Leaves 5-7-ncrved from the base 

 Leaves penninerved 

 Stems creeping and rooting at the base, 

 ascending. 

 Ijeaves ovate ..... 

 Leaves oblong-lanreolate. 



Leaves subpellucid ... 

 Leaves jnoderately thick, opaque. 

 Leaves pubescent 

 Leaves ghibrous 

 Ijeaves ovate-huiceolate . 

 Leaves oblong or ovale. 

 Leaves 3-nerved 



Leaves .5-nerved .... 

 Leaves oblong, ciliate at the apex . 

 Leaves lanceolate .... 

 licavcs obovate. 



Leaves narrowed from the middle to 



base . . . . • 



Leaves slightly narrowed at the base 

 Stems trailing and rooting nearly to the tip 

 Leaves oblong-lanceolate 

 Leaves oblong .... 



Leaves ovate-oblong 

 Leaves orbicular. 



Leaves thin, membranous . 

 Leaves thick, opaque. 

 Midrib distinct 

 Veins all hidden. 

 IJr.acts subsessile . 

 liracts shortly stalked . 

 Leaves opposite. 



Leaves oblong or suborbicular 

 Leaves rhomboid .... 



Leaves whorled. 



Leaves 3-nate ..... 

 Leaves 4-nate . . . • 



then 



1. P. fhomeana. 



2. P. pellucida. 



3. P. knohlecheriana. 



4. P. Baumannii. 



5. P. Molleri. 



6. P. rv.wenzoriensis. 



7. P. waqilensis. 



8. P. Preussii. 



9. P. vulcanica. 



10. P. Hoist a. 



11. P. nlt(jiirensi.9. 



12. P. feruandojjoiana 



the 



13. P. vacciiiifolia. 

 1-t. P. goetzeana. 



15. P. Stuhlmannii. 



16. P. ahyssinica. 



17. P. hueana. 



18. P. JIannii. 



19. P. crassifolia. 



20. P. mascharena. 



21. P. hangroana. 



. 22. P. kamerunana. 

 . 23. P. arabica, var. 

 pariifolia. 



. 24. P. Dusenii. 

 . 25. P. rejiexa. 



1. P. tHomeana, C. DC. in Bol. Soc. Brot. x. 154. Stem erect, 

 glabrous, sparingly branched ; branches very slender. . Leaves alternate, 

 obovate-oblong, 2 in. long, 1 in. broad, cuneate at the base, rounded 

 and often emarginate at the apex, firm, subpellucid, 3-nerved ; petiole 

 4 lin. long. Spikes terminal, dense, 8 lin. long ; peduncle as long as 



