CERTAMEN MELASTOMATACEIS XV. John J. Wurdack U. S. National Herbarliim, SmithBonian Institution Under the auspiceB of the Smithsonian Reeeaixih Foiindation, five months were spent during the winter of I969-TO in European herbaria working on various problems in neotropical melastomes. I am much indebted to the Old World taxonomic community (BM, BR, C, FI, G, K, LD, M, MA, OXF, P, S, SBT, W) for both scientific and social hospitality, as well as subsequent loans of selected materials. Without the generous assistance of numerous curators, the break -even point in publishable results (i.e., the number of already known taxonomic problems resolved equaling the total of both old and newly discovered ones unsettled) would not have been reached. MACAIREA MAGUIREI Wurdack, sp. nov. Ut videtur M. arirambae Huber af finis, rainulorum foliorum subtus inf lore scentiarum que pilis erectis calycis lobis longioribus differt. Ramuli sicut petioli foliorum venae primariae subtus inf lores -centiaque dense setulosi pilis plerumque 1.2-1.8 ram longis basim versus expansis non glandulosis. Petioli 0.8-1.2 cm longi; lamina 3. 5-7 X 1.5-3 cm elliptico-oblonga vel ovato-oblonga apice obtuso vel rotundato basi obtusa vel rotiindata, rigida et robuste ciliolato-serrulata, supra modice bullulato-setulosa pilorum apicibus tenuibus I.5-2 mm longis persistentibus, subtus dense appresso-setulosa pilorum basibus incrassatis et muriculatis, 3-nervata vel paulo 3~Plinervata pari exteriore 1-2 mm infra -marginali nervis secxindariis supra invisis subtus paulo obscuris ca. 2 ram inter se distantibus nervulis ob pilos occultis. Panicula 7-12 cm longa multiflora, bracteis prominentibus ovalibus vel ellipticis ca. 1 cm longis caducis, bracteolis ellipticis 2-k mm longis caducis, pedicellis 5-6 mm longis. Hypanthium 2.5-3 mm longum densiuscule laxeque strigosum pilis gracilibus ca. I.5 mm longis; calycis tubus 0.2 mm longus, lobis lanceatis ca. 3-5 nim longis intus apicem versus sparse strigulosis extus modice Btrigulosis. Petala 9-IO X 7.5-8 ram apice subtruncato et cilio-lato. Stamina dlmorphica; filamenta 6.5-7 vel 3 •5-^ ™n longa apicem versus modice glanduloso-setulosfe pilis O.I-O.I5 mm longis; antherarum thecae 3.2-3.^ X O.25 mm, connectivis 1.8-2. 5 vel 0.3-0,5 mm prolongatis, appendicibus 0.8 X O.7 vel O.5 X O.5 mm. Stigma punctiforme; stylus sparse glanduloso-strigulosufl; ovarixm 4-loculare apicem versus modice glandulis sessilibus vel paulliilo stipitatis armatum. Type Collection: Bassett Maguire, J. J. Wurdax;k, & W. M. Keith U18OO (holotype US 23U259O; isotypes NY, P), collected at edges of Sabana El Venado, left bank of Cano Pimichfn 2 km above 369
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