1963] 



BOTANY OF THE GUAYANA HIGHLANDS PART V 



173 



latis: flores 5-meri ca. 1-2 mm pedicellati, bracteolis 0.5 mm longis subulatis 

 sparse stellulato-furfuraceis ad hypanthii basim insertis mox caducis. Hypan- 

 thium (ad torum) 1.1 mm longum teres modice pilis brevissimis clavatis lucidis 

 obsitum ; calycis tubus 0.2 mm altus, lobis interioribus 0.2 mm altis triangularibus 

 basi vix remotis, dentibus exterioribus distinctis uon eminentibus. Petala alba 

 1.7-1.8 X 0.9-1 mm oblonga apice rotundata vel inconspicue emarginata dense 

 minuteque papillosa. Stamina vix dimorphica glabra, filamentis 1—1.2 mm longis. 

 Stamina maiora : antherarum thecae 0.35-0.4 mm longae apice truncatae et late 

 porosae, connective- 0.5-0.6 mm prolongato basi dorsaliter cum appendice de- 

 sceiidente truncata 0.4 X 0.4 mm. Stamina minora : antherarum thecae 0.3 mm 

 longae apice late porosae, connectivo 0.4 mm prolongato basi dorsaliter appendice 

 descendenti distaliter rotundata 0.2 mm longa. Stylus 2 x 0.25 mm glaber ; stigma 

 inconspicue expansum ; ovarium 3-loculare 1/2-inferum 12-ovulatum apice im- 

 perspicue papillosum. 



Type. Occasional along Canon Grande SS W of Cumbre Camp, Cerro de la 

 Xeblina, Terr. Amazonas, Venezuela, alt. 1100 m, 24 Dec 1957, Bassett Maguire, 

 .John J. Wurdack, & Celia K. Maguire 42474 (holotype US 2342616). 



Examination of buds of Spruce 2747 (NY) revealed stamens quite similar to 

 those of M. perturbata but with the small anther connectives consistently simple 

 at the filament insertion, as well as a truncate calyx limb and hypanthium plus 

 calyx (at a comparable bud stage) only 2/3 as long. M. tetragona also has leaf 

 apices slenderly acuminate for 1-1.5 cm and veinlet reticules mostly less than 

 1 mm across, but large anther connectives dorsally appendiculate as in the 

 Neblina species. Probably both relatives should be aligned with M. pilgeriami 

 Ule and M. stellipilis Cogn. which also have the mostly sterilized anther thecae 

 noted by Gleason (Bull. Torrey Club 63: 536. 1936). I have reservations as to 

 the distinctness of M. pilgeriana from M. tetragona, and at least part of the 

 material cited in Macbride's Flora of Peru is referrable to M. dolichorrhyncha 

 Naud. or M. solmsii Cogn. To M. tetragona, I have referred without doubt Klug 

 635 (Mishuyacu, Loreto, Peru) and Krukoff 9011 (S. Paulo de Olivenca, Ama- 

 zonas, Brazil) ; both these collections show the numerous minute glistening clavate 

 hypanthial hairs seen in the Panure isotype. A. C. Smith 2712 (Onoro Creek, 

 British Guiana), distributed as M. tetragona, is better placed in M. regelii Cogn. 

 because of the dense definitely stellulate hypanthial pubescence and the long 

 anther thecae. 



Miconia dioica Wurdack, sp. nov. 



Sect. Cremanium. M. manicatae Cogn. & Gl. ex Gl. affinis sed foliis ovatis non 

 ciliatis, ramis ad nodos in petioli insertionem elevatis non vere manicatis, floribus 

 minoribus. 



Prutex scandens ad 5 m altus glaber ; ramuli primum rotundato-quadran- 

 gulares demum teretes ad petioli insertionem in cylindrum 1-2 mm longum 

 elevati. Petioli 1-2 cm; lamina 4-8 X 2-4.5 cm lanceolata vel ovata apice per 

 0.5-1 cm subgraditer hebeti-acuminata basi rotundata tenuiter coriacea leviter 

 (1-2 mm) triplinervata (jugo exteriore tenuissimo neglecto) nervis secundariis 

 1-3 mm inter se distantibus nervulis laxe reticulatis subtus primum modice nigro- 

 punctata punctis demum inconspicuis integra non ciliata. Panicula 4-8 cm longa 

 pyramidata ramis primariis secundariisque rectis vel vix adscendentibus ; flores 

 5-meri ut videtur dioici ca. 1 mm pedicellati, pedicellis ad medium bibracteolatis ; 

 bracteolae 0.7-1 mm longae oblongo-subulatae caducae. Hypanthium (ad torum) 



