1963] 



BOTAXY OF THE GUAYANA HIGHLANDS PART V 



165 



and Riedel material (K, US) of L. rhamnifolia var. rhamnifolia does not seem 

 specifically distinct from L. divaricata; many recent British Guiana collections 

 ascribable to this complex (Gleason 665, Hitchcock 17324, Tatin 313, Maguire & 

 Fanshawe 22918, de la Cruz 1149, 1525, 1985, 2323, 3869) show varying degrees 

 of hypanthial glandulosity. The rather similar L. secunda (Don) Cogn. (of 

 Amazonian Peru, Ecuador, and Colombia), also with gland-tipped hypanthial 

 hairs, has however a 5-celled sparsely glandular-setulose ovary. L. secundiflora 

 (DC.) Cogn. was characterized as with 4-merous flowers by Cogniaux; however, 

 at least one Cogniaux-cited collection (Traill 257, K) has 5-merous flowers (with 

 a glabrous 3-eelled ovary). If the Martins holotype (which I have not seen) is 

 conspecific with the Traill specimen, L. divaricata would revert to synonymy 

 under L. secundiflora. 



Miconia iluensis Wurdack, sp. nov. 



Sect. Tamonea. M. guianensi (Aubl.) Cogn. affinis sed stylo sparse glanduloso- 

 puberulo toro ovarioque glabris. 



Frutex vel arbor parva ; rami subnodosi obtuse quadrangnlares primum cum 

 petiolis foliis supra inflorescentiis bracteisque sparse stellulato-furfuracei demum 

 glabrati. Petioli 2-3.5 cm; lamina (acumine excluso) 10-14 X 3.5-6 cm elliptica 

 apice breviter graditer angusteque per 0.5-1 cm acuminata basi late acuta vel 

 obtusa rigide membranacea. ut videtur glabra sed sub lente subtus sparse per- 

 sistenterque stellulato-furfuracea et in nervorum primariorum axillis sparse 

 inconspicueque pilis barbellatis 0.5-1 mm longis apice vix stellatis ornata, 5- 

 nervat'a nervis secundariis plemmque 4-5 mm inter se distantibus, integra non 

 ciliata. Panicula 10-12 cm Longa oblonga, ram is ascendentibus ad nodos plemm- 

 que 4-verticillatis apice floribus 6-meris ad basim bibracteatis in dichasio ; 

 pedicelli 6-12 inm longi ; bracteae 8-10 X 5-7 mm obovato-ellipticae apice obtusae 

 ad anthesim caducae. Hypanthium (ad torum) 3.8-4 mm glabrum ; calycis tubus 

 1 mm altus apice truneatus vel vix 6-undulatus glaber, dentibus exterioribus non 

 evolutis ; torus glaber. Petala 8.5-9 x 4.5-5 mm obovato-oblonga apice asym- 

 metrice rotundato-truncata ad margines densiuscule glandulis sessilibus minutis- 

 simis obsita alioqui glabra. Stamina glabra vix anisomorphica ; filamenta 7.5 vel 

 6.5 mm ; antherarum thecae 8-8.5 vel 6-6.5 mm subulatae undulatae apice minute 

 uniporosae, connectivo sub loculis ventraliter appendice 0.5-0.6 X 1 mm truncata 

 vel vix emarginata ornato dorsaliter non appendiculato sed ca. 1-2 mm supra 

 basim distincte elevato. Stylus 12.5 X 0.6-0.8 mm infra medium sparse glandu- 

 loso-setulosus apicem versus A T ix expansus ; stigma expansum 1.5 mm diam ; 

 ovarium 4-loculare 1/5-inferum apice in collum crassum lobulatum 0.5 mm altum 

 circum stylum protractum glandulis minutissimis sessilibus sparsis exceptis 

 glabrum. 



Type. Petals pink, anthers yellow, occasional on slopes between Camp No. 2 

 and escarpment base, Ilu-tepm, Edo. Bolivar, Venezuela, alt. 1900-2300 m, 16 

 Mar 1952, Bassett Maguire 33436 (holotype US 2342473). 



All of the 20 observable flowers in the type collection were 6-merous. M. 

 guianensis and the other species included in the discussion of M. superba Ule 

 (vide infra) have a sparsely to moderately stellate-puberulous torus and ovary, 

 as well as a glabrous to basally moderately stellate-pubescent style. In vegetative 

 pubescence density, M. iluensis is like the glabrescent element, M. florida (DC.) 

 Naud., included in M. guianensis by Gleason. The divergence from the postulated 

 relatives in interior floral pubescence may well indicate that, despite the remark- 



