1961] 



BOTANY OF THE GUAYANA HIGHLANDS PART IV (2) 



35 



furacea alioqui glabra. Inflorescentia ca. 7 cm longa plerumque cum ramis 

 duobus 2.5-5 cm longis; ramuli usque ad 5 mm longi confertiflori pauciflori. 

 Flores 4-meri sessiles. Hypanthium (ad torum) 3.4 mm altum anguste oblongum 

 sparse furfuraceo-puberulum 8-sulcatum ; calycis lobi interiores membranacei 

 ad 0.2 mm coaliti abrupte acuti, lobis exterioribus quam interioribus vix longi- 

 oribus 0.6 mm altis triangulari-ovatis apice late acutis. Petala 1.6 X 1-1.1 mm 

 obovata apice oblique retuso-truncata extus vix granulosa. Stamina isomorphica ; 

 filamenta 1.3-1.5 mm longa; antherarum thecae 2.6-2.9 mm longae curvatae, 

 connectivo sub thecis 0.3 mm prolongato cum filamento simpliciter articulato 

 non appendiculato. Stylus 5.7 X 0.2 mm; stigma truncatum ca. 0.15 mm diam. ; 

 ovarium 3-loculare apice in collum 0.6 mm altum circum stylum prolongatum 

 collo apice brevissime (0.1 mm) glanduloso-ciliato. 



VENEZUELA: Amazonas: occasional in flooded forest of uppermost Eio Yatua, alt. 140 

 m; weak shrub, flowers white; 7-8 Dec 1953, Maguire, Wurdack $ Bunting 36695 (holotype, 

 NY); same locality, Maguire, WurdacJc $ Bunting 36530 (paratype). 



M. lateriflora has glabrous branchlets and basally nerved leaves. 

 Miconia rupticalyx Wurdack, sp. nov. 



M. wagneri Macbr. valde affinis sed cum pubescentia stellata non stipitata 

 bracteolis conspicuis persistentibus connectivi appendice dorsali minore. 



Sect. Laceraria. Rami teretes vel vix complanato-teretes cum inflorescecttiae 

 ramis petiolisque densiuscule stellato-furfuracei. Petioli 4—11 cm longi; lamina 

 membranacea 12-28 X 9-19 cm late ovata apice per 1-2 cm subabrupte angus- 

 teque acuminata basi rotundata ad margines undulato-serrulata dentibus ca. 2-3 

 mm inter se distantibus unisetulosis seta caduca ad 1 mm longa, 5- vel indistincte 

 7-nervata nervis secundariis 5-9 mm inter se distantibus tertiariis laxe reticu- 

 lars omnibus supra subplanis subtus graciliter elevatis, supra glabra, subtus in 

 nervis primariis sparse vel modice stellato-furfuracea alioqui glabra. In- 

 florescentia paniculata ca. .10-12 cm longa lataque ramis oppositis vel subtus 

 in cuique nodo in paribus duobus distictis; ramuli divaricati. Flores in 

 capitulis paucifloris congesti plerumque 4-meri sessiles; bracteolae ad 

 1X2 mm reniformes amplectae ad margines fimbriatulae et sparse stellato- 

 puberulae. Hypanthium (ad torum) 1.9 mm longum primum sparse stellato- 

 puberulum glabratum ; calyx glaber primum in cono membranaceo apiculato ca. 

 0.7 mm alto clausus demum in lobis irregularibus persistentibus ruptus, dentibus 

 exterioribus obscuris. Petala 2.2-2.3 X 1.3-1.4 mm oblongo-obovata apice 

 rotundata. Stamina fere isomorphica; filamenta 1.6-1.7 mm longa; antherarum 

 thecae 1.9-2 mm longae, connectivo basi vix (0.2 mm) prolongato et postice in 

 calcar 0.1-0.15 mm longo elevato. Stylus 5.6 X 0.3 mm ; stigma vix capitulatum 

 vel truncatum 0.4 mm diam.; ovarium (2-) 3-loculare apice in collum 0.6 mm 

 altum circum stylum prolongatum apice lacerato et inconspicue ciliolato ciliis 

 glanduliferis 0.2 mm longis. 



VENEZUELA: Amazonas: Cerro de la Neblina, occasional in talus forest between Camps 

 3 and 4, alt. 1000-1200 m; tree 5-8 m, petals white, anthers yellow; 9 Nov 1957, Maguire, 

 Wurdack $ Maguire 42013 (holotype, NY). 



M. wagneri has short-stalked stellate trichomes, inconspicuous setaceous 

 early-caducous bracteoles and a conspicuous blunt dorsal connective appendage 

 0.2-0.25 mm long. Another close relative, M. duckei Cogn., has stalked stellate 

 hairs on inflorescence, stem, and lower leaf surface, and predominantly 5-merous 

 flowers with the young hypanthium setulose and the dorsal slamen connective 



