36 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[VOL. 10 



calcar 0.3-0.4 mm long. It seems probable that further collections will show 

 M. dorsiloba Gleas., of Costa Rica and Colombia, to be conspecific with M. 

 duckei. These four species, together with M. centrodesma Naud. (and probably 

 M. diaphanea Gleason), all have a calyptrate apiculate calyx splitting irregu- 

 larly at anthesis and persisting. Following Cogniaux' classification, all belong 

 in sect. Laceraria. 



Miconia centrodesma Naud. 



H. buchtienii Cogn. Repert. Sp. Nov. 8: 2. 1910. 



M. subtriloba Gleason, Bull. Torrey Club 58: 429. 1931. 



This widespread species is now known in the Guayana area from several 

 Schultes collections in the Vaupes drainage, from the slopes of Cerro Duida, 

 and from the Neblina slopes (Maguire, Wurdack & Maguire 42017). Two iso- 

 types (Martins Herb. Fl. 498) have been examined and show predominantly 

 4-merous flowers, as do other specimens over the species range; the original 

 description of 5-merous flowers was probably based on one of the few anomalous 

 flowers always found in a large collection series. 



Miconia fanshawei Wurdack, sp. nov. Fig. 31, K-Q. 



M. diaphaneae Gleas. aflinis sed cum foliis supra subpersistenter pubescen- 

 tibus hypanthio densissime longeque hirsuto calycis dentibus exterioribus eminen- 

 tibus. 



Frutex; rami cum petiolis inflorescentiis hypanthiisque densissime hirsuti 

 pilis stipitato-stellatis plerumque 1.5-3 mm longis stramineis. Petioli 1.5-4 cm 

 longi ; lamina chartacea 15-25 X 8-15 cm ovato-oblonga vel ovata apice graditer 

 vel subabrupte acuminata basi plerumque cuneata serrulata dentibus 1-2 mm 

 profundis et ca. 2 mm inter se distantibus 5- vel sub-7-plinervata, supra primum 

 modice cum pilis stipitato-stellatis vestita tarde glabrata pilis in venis primariis 

 plusminusve persistentioribus, subtus praecipue in venis venulisque modice cum 

 pilis stipitato-stellatis induta. Inflorescentia 3-13 cm longa plusminusve com- 

 pacta ramulis brevibus vel brevissimis. Flores 5-meri sessiles in glomerulis 

 lateralibus compactis. Hypanthium (ad torum) 2.5 mm altum ; calycis tubus 

 0.2 mm altus, lobis interioribus anguste triangularibus et stipitato-stellato- 

 setulosis cum corpore 0.4-0.5 mm longo, lobis exterioribus linearibus acutis dense 

 stipitato-stellato-setulosis cum corpore 1.3-1.5 mm longo lobos interiores ca. 1 mm 

 superantibus. Petala 2.7-3.5 X 0.7-1 mm oblonga apice rotundata. Stamina fere 

 isomorphfca ; filamenta 2 mm longa ; antherarum thecae 2 mm longae, connectivo 

 basi non vel vix (ad 0.3 mm) prolongato et cum filamento simpliciter articulato 

 non appendicular. Stylus 5-6 X 0.25-0.35 mm ; stigma leviter expansum ; 

 ovarium 3-loeulare apice in collum 0.3-0.6 mm longum circum stylum protrac- 

 tum collo apice vix lacerato et leviter setuloso. 



BRITISH GUIANA: Mile 114, Bartica-Potaro Eoad; subshrub of roadside and open 

 places on lateritic ironstone gravel, inflorescence scarlet, flowers yellow ; 6 Mar 1949, Brit. 

 Guiana For. Dep. 6019 (Z>. B. Fanshawe F2872) (holotype, NY, isotype, K) ; Mile 115, 

 Bartica-Potaro Road, FD 3820 (Fanshawe F1084) (K) ; Eagle Mountain, Potaro River, YJ) 

 5494 (Fanshawe F2701) (K, NY) Cparatypes). 



M. diaphanea has the upper leaf surface pubescence almost completely 

 limited to the primary veins, the long hypanthial pubescence limited to the apex, 

 and very short exterior calyx teeth which are exceeded by the interior teeth. 

 As compared with the other two collections, the Eagle Mountain paratype of 

 M. fanshawei shows extremely compact inflorescences with lateral branches 



