1961] 



BOTANY OF THE GUAYANA HIGHLANDS PART IV (2) 



39 



Ore Body, alt. ca. 300 m; tree 12 m, flowers white and odoriferous; vera, name "Maramara 

 branco"; R. S. Cowan 38118 (holotype, NY). 



M. serialis has a striking habital similarity to M. navioensis, but has a 

 thicker indument and slightly larger flowers with much larger stamens and 

 the antesepalar anther connectives prolonged only about 0.2 mm to the fila- 

 ment insertion, as well as a proportionately smaller anther pore. M. albicans 

 (Sw.) Tr. differs from M. navioensis in the subcordate to cordate leaf bases, 

 larger flowers, shorter antesepalar anther connective prolongation, very short 

 blunt alternisepalar posterior anther connective spur, and the more distinctly 

 expanded stigma. The large anther pore and long connective prolongation of 

 the flowers of M. navioensis are suggestive of Miconia sect. Glossocentrum, but 

 the obvious close affinity with M. serialis makes the present placement desirable. 



Miconia abysmophila Wurdack, sp. nov. 



M. bracteatae (DC.) Tr. affinis sed cum foliis angustioribus basi anguste 

 acutis superficie supra (venis exceptis) glabra. 



Sect. Miconia. Rami cum petiolis inflorescentiis hypanthioque densissime 

 incurvo-setulosi pilis laevibus 2-3 mm longis. Petioli 1-3 cm longi; lamina 

 coriacea integra 6.5-11 (-15) X 2-4 cm apice acuta vel paulo (usque ad 5 mm) 

 acuminata basi anguste acuta debiliter 3-plinervata (nervis duobus debilibus 

 inframarginalibus neglectis) nervis interioribus alternatim usque ad 2 cm supra 

 basim insertis, supra in nervis primariis secundariisque dense vel sparse strigosis 

 pilis 1-2 mm longis alioque glabra, subtus densiuscule strigosa pilis ca. 1-1.5 

 mm longis. Inflorescentia spicata cum floribus in glomerulos congestis vel ad 

 basim cum ramulis brevibus lateralibus usque ad 5 mm longis capitulifloris ; 

 flores 5-meri sessiles basi bracteolati, bracteolis ca. 2 X 2 mm ad margines 

 lacerato-setosis. Hypanthium (ad torum) 2.5 mm altum ; calycis tubus ca. 0.5 mm 

 altus lobis ovatis ca. 0.5 mm altis rotundatis dentibus exterioribus hebeti-acutis 

 quam lobis interioribus vix brevioribus non eminentibus. Petala 4—4.4 X 2.2-2.4 

 mm anguste obovata apice ipso vix retusa et pauciciliolata. Stamina isomor- 

 phica ; filamenta 4.5-4.8 mm ; antherae arcuato-attenuatae 3.5 mm longae basi 

 non appendiculatae cum filamento simpliciter articulatae. Stylus maturus 

 ignotus ; stigma truncatum ; ovarium 3-loculare apice libero 1 mm alto obtuse 

 conico et sparse glanduloso-puberulo pilis ca. 0.1-0.15 mm longis. 



VENEZUELA: Amazonas: Cerro de la Neblina, occasional in rock crevices along Canon 

 Grande east of Cumbre Camp, alt. 1100 m; shrub 0.7-1.5 m, buds white, fruit purple-blue; 

 24 Nov 1957, Maguire, WurdacTc 4- Maguire 42206 (holotype, NY). 



The pertinent differential characters of M. abysmophila are summarized in 

 the key to M. bracteata and relatives. 



Miconia bracteata (DC.) Triana 



M. demerarensis Gleason, Bull. Torrey Club 75:551. 1948. 



Gleason's distinctions for M. demerarensis do not hold for any series of 

 specimens of this complex; even on the holotype, some stamens have short 

 dorsal connective prolongations below the filament attachment. I have been able 

 to examine holotypic material, except for M. trichodes DC. of which material 

 has not been available to any monographer since de Candolle, for all the names 

 involved in this small species group. A tentative key to them follows : 



1. Stem and' inflorescence hairs strictly appressed. M. mutabilis (DC.) Tr. 



1. Stem and inflorescence hairs with at least the bases patent. 



