1953] 



BOTANY OF THE GUAYANA HIGHLAND 



145 



Eupatoriuir penninervatum Wurdack, sp. nov. 



Suffrutex ad 3 m.; ramis pilis flexuoso-patentibus albidis articulatis vesti- 

 tis pilis brevioribus glandulosis intermixtis; internodiis 1.5-5.0 cm. longis; 

 petiolis 6.0-6.5 cm. longis, pilis ramorum eisdem; laminis 14.5-17.0 cm=, lon- 

 gis 6.0-7.5 cm. latis membranaceis utrinque viridibus penninervatis nervis 

 majoribus utrinque 9-13, deltoideo-ovatis, distincte et regulariter acutoden- 

 tatis dentibus utrinque 20-25 prope basim saepe 3-4 mm. magnis, ad basim subcu- 

 neatis ad apicem anguste acutis, pilis ramorum eisdem praeditis; panicula glome- 

 rulorum glomerulis 2-3-capitulis; pedicellis gracillimis 1-8 mm. longis, capitulis 

 23-25-floribus; involucro turbinato 7-8 mm. longo 4 mm. diam., squamis ca 18 

 gradatis ca. 3-seriatis in dorso gl anduloso-pilosis in facie ventrali pulverulis, 

 extimis ovato-acutis 3-4 mm. longis 1.0-1.8 mm. latis 5-nervis, intimis oblongo- 

 lanceolatis acutis ad 6 mm. longis 3-nervis; receptaculo nudo hemisphaerico 

 ca. 1 mm. diam.; corolla alba angusto-cylindrica 4.0-4.2 mm. longa breviloba 

 lobis 0.15-0.2 mm. longis ad basim pulverula ad apicem sparse puberulo; pappo 

 sub anthesi 3.3-3.7 mm. longo, setis 30-35 barbellatis, achaenio immaturo 1.8- 

 2.0 mm c longo 5-angulato in angulis brevipiloso. 



TYPE: subshrub to 3 m. high, flowers white, by waterfalls below escarpment, 

 trail intermediate summit camp, in mixed montane forest, Cerro Sipapo, Terr. 

 Amazonas, Venezuela, alt. about 1000 m., Dec. 3, 1948, Bassett Maguire & Louis 

 Politi 27506; New York Botanical Garden. 



This anomalous Eupatorium has been tentatively assigned to sect. Cono- 

 clinium (sensu Robinson) because of the naked convex receptacle and involucral 

 bracts which are detached from the capitulum with difficulty; however, within the 

 section, no close relatives are apparent. 



Eupatorium roupalifolium Robins. 



Shrub to 3 m. high, summit Peak I, Cerro Sipapo, alt. 2000 m., Maguire & 

 Politi 27630; shrub, flowers white, wet ledges and cliffs, precipitous east slopes, 

 West Peak, Cerro Sipapo, alt. 1600 rn., Maguire & Politi 27821. This species is 

 apparently the most widespread Eupatorium of those endemic to the Pacaraima 

 system, being known from Roraima on the east to Sipapo and Paru on the west. 



Eupatorium xestolepidoides Wurdack, sp. nov. Sect. Cylindrocephala. 



Suffrutex fuscus ramosus; ramulis teretibus glandulosis dense breviterque 

 (0.25-0.35 mm.) lanatis; petiolis 3-5 mm. longis dense breviterque lanatis, laminis 

 2.5-3.5 cm. longis 1-2 cm. latis lanceolato-ovatis marginibus recurvatis obscure 

 dentatis, supra modice puberulis, subtus glandulosis dense breviterque lanatisque 

 et prominulenter reticulato-venosis, ad 2 mm. supra basim trinervis, ad basim bre- 

 viter cuneatis vel rotundatis, ad apicem acuminatis; corymbis laxiusculis 1-3- 

 capitulatis, capitulis 26-30-floribus ca. 9 mm. altis 3-4 mm. diam., involucro e 

 squamis 35-40 rigidiusculis pallidis lucidis ca. 6-seriatis regulariter gradatis 

 5-3-nervis caducis atomiferis ad apicem nigrescentibus marginibus perbreviter 

 ciliolatis, extimis oblongis perbreviter aristatis, intermediis oblongis obtusis 

 breviter (0.2-0.3 mm.) aristatis, intimis linearibus acutis; corolla 3.9-4.1 mm. 

 longa extus sparse glandulosa, tubo propio gracili 2.2-2.4 mm. longo, faucibus 

 campanulatis 1.2-1.5 mm. altis, dentibus recurvatis 0.4-0.5 mm. longis; pappo 

 3.5 mm. longo albido, setis ca. 27 barbellatis, achaenio nigro 3=3-3.5 mm. longo 

 5-4-angulato angulis hispido-scabratis. 



TYPE: shrub to 1 m. high, flowers pale lavender, San Antonio-Cumana road 

 pass, State of Monagas, Oct. 24, 1948, Venezuela, Bassett Maguire, H. R. Kun- 

 bardt & Louis Politi 27254; New York Botanical Garden. 



