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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[vol. 10 



mm longis orbiculari-triangularibus apice rotunclatis, dentibus exterioribus 0.2- 

 0.4 mm eminentibus apiculatis. Petala 2 X 0.8 mm obovato-oblonga apice vix 

 oblique emarginata glabra. Stamina in dimensionibus vix dimorphica ; filamenta 

 3.5 vel 2.5 mm; antherarum thecae 2.6 vel 2.3 mm subulatae sub filamenti in- 

 sertionem ventraliter 0.5-0.6 mm prolongatae et cum connectivo coalitae, connec- 

 tive sub thecas non prolongato dorsaliter non appendiculato. Stylus 12.5 X 0.25 

 mm; stigma truncatum ; ovarium 3-loculare 1/8-inferum apice in collum 0.1-0.15 

 mm longum circum stylum protractum et 5-6 setulis 0.05 mm longis ornatum. 

 Semina 0.5-0.6 mm longa laevia vel inconspicue sparseque tuberculata. 



Type. Leaves dark green above, light green beneath, brittle, calyx and corolla 

 white, anthers yellow, frequent in forest below talus along cliffs on NE side of 

 Mt. Ayanganna, upper Mazaruni River, British Guiana, alt. 800-900 m, 1 Aug 

 1960, Stephen S. Tillett, Carolyn L. Tillett, du Bufus Boy an 44977 (holotype US 

 2343854). Para types. SURINAM. Tafelberg: overhanging East Ridge Gorge, 

 Maguire 24533. BRITISH GUIANA. Mt. Ayanganna: alt. 1070 m, Tillett, Tillett, 

 & Boyan 45130. Karowtipu : alt. 490 m, Tillett, Tillett, & Boyan 45439. VEN- 

 EZUELA, Edo. Bolivar. Sororopan-tepui : alt. 1500-1800 m, Steyermark 60177, 

 Maguire & Wurdack 33960. Carrao-tepui : alt. 1400-1600 m, Steyermark 60843. 



M. pseudocapsularis has completely secund flowers on pedicels only 0.5 mm 

 long and inner calyx lobes equaling the subulate external teeth ; originally known 

 only from Amazonas, the species has also been collected on the slopes of Torono- 

 tepui (a part of the Chimanta Massif in Edo. Bolivar) at 1500 m elevation 

 (Steyermark 75490). The foliage of M. tillettii is rather reminiscent of, although 

 much thinner than, that of 31. fragrans Cogn. 31. fragrans is known from 

 Trinidad, Tobago, British Guiana (Mt. Ayanganna, Tillett, Tillett, & Boyan 

 45143), and Venezuela (Cerro La Danta, Edo. Bolivar, Steyermark & Nilsson 

 30, 188). 



The related species, 31. lateriflora Cogn., continues to accumulate synonyms. 

 31. tessmannii Mgf., from Amazonian Peru, is the same as Amazonian and 

 Guianan material previously referred to 31. lateriflora. As would be expected in 

 such a wide-ranging species, there is some variability ; Central American and 

 Pacific Colombian collections show calyx teeth 1.5-2 mm long, while Amazonian 

 and most Guianan specimens have teeth only 1 mm long. More extreme are the 

 Kanuku Mountains (British Guiana) collections (A. C. Smith 3571, 3665), with 

 pedicellate lateral flowers in each dichasium, as well as the calyx limb only 

 undulate-rimmed and inconspicuously toothed. Probably subspecific recognition 

 (or perhaps specific in the case of the Kanuku population) will be given to 

 the variants; in any event, Markgraf's name properly falls under the typical 

 subspecies of M. lateriflora. 



Miconia mariae Wurdack, sp. nov. 



M. centrodesmae Naud. affinis, sed foliis crassioribus non plinervatis floribus 

 5-meris ovario apice in collum circum stylum protracto. 



Ramuli vix compressi demum teretes petiolis foliorum venis primariis subtus 

 inflorescentiisque sparse stellato-puberuli mox glabrati. Petioli 1.5-4 cm ; lamina 

 12-22 X 5-13 cm elliptica apice per 0.5-1 cm graditer hebeti-acuminata basi 

 obtusa vel rotundata rigide membranacea, in superficie glabra, ad margines sparse 

 appresso-ciliolata et integra vel inconspicue crenulato-serrulata, 5-nervata 

 nervulis laxe reticulatis. Panicula 7-12 cm longa diffusa ramis lateralibus 

 oppositis vel 4-verticillatis ; pedicelli 0-0.5 mm longi ; bracteolae ca. 0.3 mm longae 



