313 



NEW RUBIACEiE FROM TROPICAL AMERICA.— V. 



By H. F. Wernham, D.Sc, F.L.S. 



(Department of Botany, British Museum.) 



(Continued from p. 227.) 



The present paper is confined to species of the large genus 

 Psi/chotria, and its immediate ally Cephaelis, so abundantly 

 represented in Tropical America. The types of all are, as indi- 

 cated in each case, in either the National Herbarium or that at 

 Kew, or both ; to the respective authorities of which I am indebted 

 for the necessary facilities for examination of the specimens. 

 '\^ Cephaelis thibaudiae folia Wernham, sp. nov. Frutex bi- 

 orgyalis, ramulis validis novellis plus minus glandulose puberulis; 

 foliis crassis margine revolutis, ovatis v. lanceolatis, 4-5-7'5cm.x 

 l*4-2-4 cm., acuminatissimis apice acutissimis, basi brevissime 

 acuminatis v. subrotundatis, supra glaberrimis nitentibus, subtus in 

 vena centrali nonnunquam obscure puberulis nonnunquam glabris, 

 venis secundariis utrinque 6-7 obscuriusculis v. subtus prominulis, 

 petiolo minute glandulari-puberulo ad 8 mm. longo, stijmlis in 

 vaginam brevem oblongam connatis aristis 2 brevibus distantibus. 

 Flores inter minimos in capitulis involucratis ad 14 cm. diam. 

 dispositis, pedunculis graciliusculis ad 4-5 cm. longis puberulis, 

 bracteis exterioribus linearibus v. lineari-lanceolatis ad 8 mm. 

 longis. Bacca sulcata pisiformi glaberrima. 



Guiana: Hostmcmn, 801! Potaro River, Kaieteur Savannah, 

 Jcnman, 867! Hbb. Mus. Brit, and Kew. 



Readily recognized by the thick, acuminate leaves, recalling, 

 save in their small size, those so common in the Thibaudia group 

 of Vacciniacece. 



Cephaelis Jenmanii Wernham, sp. nov. Glaber, /oZi/s ellip- 

 tico-oblanceolatis, + 17 cm. x 7 cm., brevissime acuminatis ob- 

 tusis, basi acutis, petiolo graciliusculo ad 2-5 cm. longo, utrinque 

 glabris, venis secundariis plurimis approximatis utrinque promi- 

 nulis, stiindis late oblongis + 1 cm. longis apice bifidis vaginantibus. 

 Floribus in capitulis pro genere parvis compositis plerumque 3, 

 pedunculis primario 3 cm. v. longiore lateralibus + 1 cm., sulcatis 

 validiusculis, bracteis involucellorum late ovatis ca. 4 mm. x 4 mm. 

 minute ciliatis, bracteis primariis 2 lanceolatis acutis concaveis 

 6 mm. longis ; calyce minute dentato v. subintegro ; corolla crassa 

 tubo gracili 1-3 cm. longo, lobis vix 2 mm. longis revolutis. 



Guiana: Potaro River, Sheenabowa ; fl. Sept. -Oct., Jcnman, 

 1291 ! Hb. Kew. 



Near the Bolivian C. conepJioroides Rusby; distinct in the 

 divided stipules and slender, longer corolla. 



Cephaelis kaieteurensis Wernham, sp. nov. Glaber, ramulis 

 gracilibus, foliis oblongo-oblanceolatis 10-15 cm. x 3-4 cm., 

 caudato-acuminatis utrinque acutis glaberrimis, petiolo tenui ad 

 2 cm. longo, venis secundariis plurimis approximatis vix pro- 

 minulis, stiindis oblongis vaginantibus diutius persistentibus 

 3-3-5 mm. longis apice acutissime bifidis. Floribus in capitulis 

 JouRNALi OF Botany. — Vol. 52. [December, 1914.] 2 a 



