Miconia jorgensenii 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. Cremanium. M. loxensi (Bonpl.) DC. affinis, sed foliis ad apices rotundatis, antherarum connectivis appendiculatis differt. Ramuli teretes sicut petioli foliorum venae primariae subtus inflorescen-tiaque primum sparse (ad nodos densiuscule) furfuracei pilis ramosis 0.2-0.3 (-0.5) mm longis apicem versus barbellatis paulo deflexis vel erectis demum gla-brati nodis paulo tumidis petiolorum insertionibus ca. 1 mm elevatis. Petioli 0.6-0.9 cm; lamina 4-6 X 3-4 cm tenuiter coriacea late elliptica apice rotundato et abrupte per 1-2 mm hebeti-acuminato basi late obtusa vel rotundata margine subtus incrassato et apicem versus inconspicue serrulato dentibus callosis 0.1-0.2 mm altis et 2-3 mm inter se distantibus, trinervata nervis secundariis 2-2.5 mm inter se distantibus subtus inconspicue elevatis nervulis supra invisis subtus essen-tialiter planis et creberrime reticulatis, supra glabra, subtus in nervulis super-ficieque sicut hypanthiis ut videtur glabra sed sub lente glandulis rubris 0.05 mm diam. modice armata. Panicula ca. 8 x 8 cm pauciflora nodis paulo tumidis; flores 5-meri, 0.5-1 mm pedicellati, bracteolis 2.5-3 X 2 mm ovato-ellipticis con-cavis sparse stellulato-furfuraceis ante anthesim deciduis. Hypanthium (ad torum) 1.9-2.2 X 2.4 mm; calycis tubus 0.2-0.3 mm altus, lobis interioribus 0.7 X 1.4 mm oblatis ápice rotundato, dentibus exterioribus callosis lobos interiores aequantibus vel 0.1 mm superantibus. Petala obovato- rotundata glabra 2.3 X 2 mm. Stamina glabra connectivis paulo anisomorphicis; filamenta 2.2-2.6 mm; antherarum thecae 1.1-1.3 X 0.6-0.7 mm ápice late (0.5 mm) biporosae ventraliter ad basim per 0.2 mm steriles (ut videtur biappendiculatae) , connectivo dorsaliter ad basim cornu hebeti erecto-descendente 0.2 mm longo (staminum intersepalum) vel cornu descendente 0.3 mm longo emarginato (staminum alternisepalum) armato. Stylus 3.7-3.9 X 0.2-0.35 mm apicem versus incrassatus glaber; stigma 0.6-0.8 mm diam. expansum; ovarium 2 (?)-loculare 0.6 inferum apice conico 0.5 mm alto glandulis sessilibus minutissimis paucis ornato stylo 0.2 mm immerso.
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Discussion
Type Collection: H. Jorgensen & F. Prieto JP-5S (holotype US 2404650; isotype NY), collected at Hacienda Huilcabamba, slopes NW of Nudo de Sabanilla, about 54 km south of Loja, Prov. Loja, Ecuador, elev. 2100 m, 9-12 Jul. 1944. “Vinelike, scrambling among other plants, but with its own central stem 2-3 cm diam. Flowers white.” Miconia loxensis (ex descr. and Macbride photo 25983) has narrowly and gradually acute leaf apices, leaf margins distally appressed-ciliate (hairs ca. 0.7 mm long), and exappendiculate stamens; also the pubescence is much denser and extends to the hypanthia. A single leaf of the type collection of M. loxensis (Cogniaux herbarium, BR) has been examined; the lower surface shows much laxer venule reticulation (areoles ca. 1 mm wide, rather than 0.5 mm) than in M. jorgensenii; the primary and secondary veins are armed with slender flexuous unbranched hairs ca. 0.5-0.7 mm long, the apices slightly expanded and minutely roughened. With some doubts, Steyermark 53604 (NY, US) , fruiting, from between Campanas and Arenillas along the Río Tintas, Santiago-Zamora, and Camp E-226, from Cerro Villanaco, Loja, have been referred to M. loxensis. Two other species in this relationship are M. polyneura Triana (with definitely 5-nerved prominently callose-serrulate leaves) and M. cladonia Gleason (with supra-nodal zones of rather caducous smooth gland-tipped hairs and prominent projecting thecal dissepiments) ; the latter species seems better placed here than in sect. Chaenopleura. These four species all share the characters of cladonioid stem pubescence, tumid nodes, and elevated petiole insertion calluses on the branchlets.