Miconia pausana Wurdack
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Authority
Wurdack, John J. 1967. Plants collected in Ecuador by W. H. Camp. Melastomataceae. Mem. New York Bot. Gard. 16: 1-45.
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Family
Melastomataceae
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Scientific Name
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Description
Latin Diagnosis - Sect. Amblyarrhena. M. amabili Cogn. et M. bangii Cogn. affinis, sed foliis minoribus. Ramuli hebeti-quadrangulati sicut folia inflorescentiaque indumento amor-pho-squamoso appresso induti mox glabrati. Petioli 1-2 cm; lamina 10-13 X 3.5-5 cm tenuiter coriacea essentialiter integra glabrata elliptica ápice breviter (0.5-1 cm) hebeti-acuminato basi late acuta, 3-nervata (pare debili inframarginali neg-lecto) nervis primariis lateralibus costa per 3 mm coalitis nervis secundariis tenuibus ca. 5 mm inter se distantibus nervulis supra invisis subtus planis et crebre reticulatis areolis 0.3-0.5 mm latis. Panicula 8-12 cm longa pyramidata multiflora; flores 5-meri 0.5-1 mm pedicellati, bracteis 1.6-2.2 X 0.4-0.6 mm sicut bracteolis mox caducis, bracteolis 1 X 0.1-0.2 mm ad pedicelli basim insertis. Hypanthium (ad torum) 2.5 X 2.9 mm glabrum; calycis tubus 0.4-0.8 mm altus, lobis interioribus membranaceis 0.5 mm altis ovatis ápice hebeti, dentibus exterioribus inconspicuis acutis non eminentibus. Pétala 2 X 1.7-1.8 mm sub lente minutissime granulosa obovato-oblonga apice oblique rotundato-truncato. Stamina isomorphica; filamenta 2.2-2.5 mm modice glandulis clavatis 0.1 mm longis ornata; antherarum thecae 1.8 X 0.6 X 0.5 mm oblongae apice ventraliter uniporoso (poro 0.2 mm diam.), connectivo nec prolongato nec appendiculato. Stylus 4.5 X 0.5 mm modice puberulus pilis flexuosis glanduliferis 0.1 mm longis; stigma expansum 0.8-0.9 mm diam.; ovarium 5 (?) -loculare 2/3 inferum apice conico 0.8 mm alto minute glanduloso-puberulo (pilis 0.05 mm longis), stylo 0.4 mm immerso.
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Discussion
Type Collection: W. H. Camp E-1603 (holotype US 2404695; isotype NY; 1 additional isotype to be distributed), collected in the region of Tambo Consuelo, eastern slope of the cordillera, valley of the ríos Negro and Chupianza, on the trail from Sevilla de Oro to Mendez, Prov. Santiago-Zamora, Ecuador, elev. 2400 m, 16 Dec. 1944. “Trees 5-6 m. Leaves pale yellowish green, shining above; dull below. Corolla and filaments white; anthers yellow.” Both M. amabilis and M. bangii have considerably larger leaves; the former has the lower leaf surfaces with laxer venation (the principal veins being sparsely furfuraceous), moderately furfuraceous-puberulous inflorescences and hypanthia, and larger calyx lobes; the latter has distinctly 5-plinerved leaves and slightly (ca. 25%) longer, relatively narrower anthers. Miconia terera Naud. differs at least in the distinctly plinerved leaves and (by implication) glabrous filaments and style. Despite the geographic disjunction, I have recently referred Ecuadorian collections from Mera (Asplund 19686,19687; Harling 3167) to M. terera; this material certainly agrees with Killip and Smith collections from Junín, Peru. Examination of Naudin’s type may well show M. cookii Gleason to be a synonym of M. terera. Miconia tonduzii Cogn.—as far as Tonduz 1948, 2112, 2113, 2113, 2116 (all US, collected in February, 1890) are concerned, as well as many later Costa Rican collections—shows 2- or indistinctly 4-pored anthers and should be placed in sect. Cremanium (and not in sect. Amblyarrhena); in vegetative features, Camp E-1603 shows some resemblance to the Costa Rican species.