Monographs Details: Leandra longisepala Wurdack
Authority: Maguire, Bassett & Wurdack, John J. 1961. The botany of the Guayana Highland--part IV (2). Mem. New York Bot. Gard. 10: 1-87.
Family:Melastomataceae
Description:Latin Diagnosis - Inter congeneros sectionis cum conjunctione foliorum submagnorum paulo pubescentiumque et sepalorum magnorum bene distincta. Sect. Secundiflorae. Rami cum petiolis inflorescentiisque dense subsericeostrigosi pilis laevibus ca. 1 mm longis. Petioli 3-7 cm longi; lamina membranacea 9-17 X 4-9 cm ovata apice anguste acuminata basi rotundata ad margines distincte serrata dentibus ca. 6/cm et ca. 1 mm profundis singulis unisetosis seta 1-2 mm longa, breviter 7-plinervata jugo interiore 6-11 mm supra basim inserto jugis exterioribus ad basim ipsam insertis nervis secundariis ca 4-5 mm inter se distantibus nervis omnibus supra planis subtus graciliter elevatis, supra sparse strigulosa pilis ca. 1 mm longis et 3-4/mm2, subtus in venis venulisque modice strigulosa sed in superficie glabra. Inflorescentia ca. 12-17 cm longa cum ramis arcuato-divaricatis ad 8 cm longis secundifloris. Flores inter se satis distantes sessiles 5-meri; bracteolae persistentes 2.5-3 X 0.3-0.5 mm lineares setulosae. Hypanthium (ad torum) 2.3-2.5 mm altum densiuscule strigulosum pilis eglandulosis plerumque 0.7-1 mm longis et modice cum glandulis clavatis sessilibus vix 0.1 mm longis obsitum. Calycis tubus 1 mm altus, dentibus interioribus ovatis rotundatis 1 mm altis, dentibus exterioribus ca. 2.5 mm longis oblongolanceolatis anguste acutis extus et ad margines setulosis setis 0.5-0.7 mm longis. Petala 3.6-3.8 X 15-1.6 mm ovata apice anguste acuminata. Stamina in magnitudine vix dimorphica sed in forma isomorphica; filamenta 2.9-3.3 mm longa; antherae 2.-1—2.6 mm longae anguste oblongae apice minute uniporosae (poro 0.15 mm diam.), connectivo basi postice unicalcarato calcare 0.2 mm longo. Stylus 6 X 0-3 mm ; stigma punctiforme; ovarium triloculare apice glabrum et in collum ca. 0.4 mm altum circum stylum protractum dentibus irregularibus subsetulosis; bacca ca. 6-7 mm diam., seminibus 0.5 X 0-35 mm leviter denseque tuberculatis.

Distribution and Ecology - VENEZUELA: Amazonas: Cerro de la Neblina, occasional on slopes just below escarpment east of Camp 3, alt. 1600-1700 m; shrub 1.5-2.5 m, inflorescence branches pale pink, petals pale translucent pink, stamens pale yellow, fruit deep purple; 27 Dec 1953, Maguire, Wurdack & Bunting 36914 (holotype, NY).

Discussion:

Fig. 31, A-J.

Among the 5-merous species of Leandra sect. Secundiflorae, only L. francavillana Cogn. and L. longiconta Cogn. approach L. longisepala in sepalar dimensions; the former species has leaf blades beneath densely sericeous as well as crowded flowers, while the latter has spreading longer stem, inflorescence, foliar, and hypanthial hairs.