1963] 



BOTANY OF THE GUAYANA HIGHLANDS PART V 



215 



In this species a resinous exudate is commonly developed on the upper part 

 of the branches at the base of the pedicels, petioles, and on the lower part of the 

 leaf-blades. The stipules are exceptionally large in this species. The upper part 

 of the branches are usually gTanular-puberulent. 



2. Kotchubaea palustris Ducke, Arch. Inst. Biol. Veg. 4 1 : 62-63. 1938. 



Distribution. Amazonian Brazil-Colombia frontier, in drainage of the upper 

 Rio Negro along Rio Macacuny. 



BRAZIL. Amazonas: Rio Xegro superioris, Igarape Macacuny; ad ripas 

 paludosas; arbor parva ; floris albis; 20 Sep 1935, A. Ducke 34642 (staminate) 

 and 34643 (pistillate) (isotype US) ; Macacuny, circa Cucuhy, Rio Negro supe- 

 rioris ; in silvis humilioribus secus ripas paludosas fluminis ; 20 Sep 1935, Ducke 

 219 (NY). Also recorded as seen by Ducke "in paludibus secus Igarape Jurupary, 

 fluminis Vaupes inferius affluentem" in adjacent Colombia, which report may 

 refer to the closely related K. micrantha. 



3. Kotchubaea micrantha Steyermark, sp. nov. 



Arbor dioica, ramulis glabris; stipulis persistentibus ovatis apice anguste 

 obtusis 5-9 mm longis subglabris vel extus puberulentibus marginibus ciliolatis ; 

 foliis adultis glabris petiolatis vel superioribus subsessilibus, petiolis 2-5 mm 

 Longis glabris ; laminis coriaceis late obovatis vel oblongo-obo\ atis apice rotundatis 

 vel subacutis basi obtusis vel subacutis 8-14 cm longis 4-9 cm latis glabris, nervis 

 lateralibus utroque latere 5-7 supra tenuissime impressis subtus subpromi- 

 nentibus; floribus masculis cymis pedunculatis, pedunculo 1.5-5 cm longo glabro, 

 irregulariter 6-13-floris dispositis, pedicellis 2-5 mm longis puberulentibus; 

 pedunculis prominentibus 1.5-5 cm longis angulatis glabris; calyce masculo 

 cylindrico-tubuloso 7-9.5 mm longo 3.5^.5 mm diam extus puberulent intus dense 

 villoso basi glabro 7 mm excepto, apice 7-denticulato dentibus late deltoideis 

 subobtusis vel acutis 0.5 mm longis; corolla mascula alba hypocrateriformi tubo 

 22-28 mm longo 3-3.5 mm lato, superne paullo ampliato fauce 5 mm diam, 6-7 

 mm longo ; tubo extus dense cano-sericeo intus dense sericeo, lobis 7 lineari- 

 lanceolatis subfalcatis attenuatis apice subacutis 15-20 mm longis 1.5-3.5 mm 

 latis utrinque canotomentellis ; staminibus 7, antheris lineari-oblongis 5-5.5 mm 

 longis apice acumine late lanceolato acuto 0.5 mm longo basi obtuso ; floribus 

 f emineis non visis ; bacca non visa. 



Distribution : southwestern Venezuela and adjacent Colombia. 



VENEZUELA. Territorio Federal Amazonas : en los margenes del Alto Rio 

 Atacavi ; arbolito con flores blancas ; bastante comun ; los troncos durante la 

 estacion lluviosa sumergidos en el agua negra; 7 Sep 1960, E. Foldats 3758 

 (holotype VEN, isotype NY). 



COLOMBIA. Amazonas-Vaupes : Rio Apaporis, Jino-Goje, entre los rios 

 Paraparana y Popeyaka ; alt. 250 m ; arbol 15 m ; flores blancas muy aromaticas ; 

 hojas verde claro ; 3-11 Sep 1952, H. Garcia Barriga 14342 (paratype US). 



This species is distinguished by the elongate peduncle of the staminate in- 

 florescence and by the small corollas. It is noteworthy also for the broadly 

 rounded apex of the leaf-blades and the densely villous interior of the upper 

 two-thirds of the corolla-tube. 



