1963] 



BOTANY OF THE GUAYANA HIGHLANDS PART V 



169 



setaceae; flores 5-meri. Hypanthium (ad torum) 1.8 mm longum inconspicue 

 10-costatum glabrum ; calyx primum clausus, cono 0.8 mm alto apiculato, demum 

 in lobis membranaceis irregularibus ruptus; torus dense glanduloso-ciliolatus 

 pilis 0.05 mm longis. Petala 3 X 1.2-1.5 mm oblongo-obovata apice rotundata 

 glabra. Stamina fere isomorphica ; filamenta 1 mm longa; antherarum thecae 

 1 mm longae apice minute uniporosae, connectivo ad filamenti insertionem non 

 prolongato dorsaliter appendice 0.15 X 0.15 mm descendente distaliter vix emar- 

 ginata. Stylus 5.5 X 0.3 mm glaber ; stigma truncatum ; ovarium 3-loculare apice 

 modice glanduloso-puberulum (pilis 0.05 mm longis) et in collum 0.7 mm altum 

 circum stylum protractum. 



Type. Shrub 3 m, petals, filaments, and style white, anthers yellow, locally 

 frequent in slope forest at base of southwest-facing lower escarpment of Amuri- 

 tepui, Chimanta Massif, Edo. Bolivar, Venezuela, alt. 1275 m, 11 Mar 1955, 

 J. A. Steyermark & J. J. Wurdack 1369 (holotype US 2342424). 



The specific epithet commemorates my botanical illustratress. All of the 15 

 examined flowers were 5-merous. M. centrodesma has membranous 5-plinerved 

 leaf blades, predominantly 4-merous flowers, and a truncate ovary apex. Since 

 my previous synonymy summary of M. centrodesma, an isotype (G-DEL) of 

 M. centrandra Ule has been examined; Vie 9675 conforms with abundant other 

 material of M. centrodesma and. accordingly, .1/. centrandra can be placed in 

 synonymy. 



Miconia cautis Wurdack, sp. nov. 



Sect. Miconia. M. platypodae Gleason affinis sed dichasiis pedunculitis in- 

 florescentiae pilis pallide rubris. 



Rami primum vix compressi mox teretes cum petiolis inflorescentiis hypanthi- 

 isque dense stellulato-furfuracei. Petioli 0.7-2 cm longi valde compressi; lamina 

 9-22 X 3.5-7 cm anguste oblongo-elliptiea recta vel vix falcata apice breviter 

 (0.5-1.5 cm) subabrupteque hebeti-acuminata basi acuta rigide membranacea, 

 supra glabra, subtus in venis primariis sparse vel modice stellulato-furfuracea 

 alioqui glabra, breviter (2-5 mm) 3-plinervata nervulis subtus creberrime elevato- 

 reticulatis, integra. Panicula 7-11 cm longa pyramidata, ramis primariis infimis 

 4-6 cm longis ramulis 3-6 mm longis; flores 4-meri sessiles vel vix (ad 0.5 mm) 

 pedicellati ; bracteolae 0.1-0.2 mm longae lanceolatae stellulato-furfuraceae mox 

 caducae ad hypanthii basim insertae. Hypanthium (ad torum) 1.9-2.2 mm 

 longum apicem versus sparsissime glanduloso-setulosum setulis 0.2-0.3 mm longis ; 

 calycis tubus 0.2 mm altus, lobis interioribus 0.5-0.55 X 0.7 mm triangularibus, 

 dentibus exterioribus hebeti-acutis vix (0.1 mm) eminentibus. Petala 0.7 X 0.4 

 mm late elliptica apice rotundata inconspicue granulosa. Stamina isomorphica 

 glabra; filamenta 1 mm longa; antherarum thecae 1.6 mm longae lineari- 

 lanceolatae, connectivo cum thecis coalito non incrassato. Stylus 2.7 X 0.2 mm 

 glaber; stigma truncatum; ovarium biloculare ca. 1/4-inferum apice in collum 

 0.3 mm altum modice stellulato-furfuraceum circum stylum protractum. 



Type. Shrub 1.5 m, inflorescence branches reddish, flowers white, slope forest 

 of Piedra Tururumeri, Rio Yatua, Terr. Amazonas, Venezuela, alt. 110-220 m, 

 4 Feb 1954, Bassett Maguire, John J. Wurdack, & George S. Bunting 37498 

 (holotype US 2342550). Paratypes. VENEZUELA, Terr. Amazonas. Rio Yatua: 

 base of Piedra Arauicaua, alt. 100-140 m, Maguire, Wurdack, & Bunting 37456. 

 Cerro Duida : Caiio Negro slopes, alt. 305-1095 m, Steyermark 57967. COLOM- 



