A new species of the hemiparasitic genus Oryctanthus from Colombia is described and illustrated. This species is known only from two nearby localities and it can be distinguished from similar species by its terete stems being grayish at maturity, coriaceous leaves with secondary inconspicuous venation and completely furfuraceous inflorescence peduncles, which are 3 or 4 times longer than the fertile portion of the inflorescence. Taxonomic affinities of this species and its conservation status are also discussed.
Phoradendron killipii is an endemic species from Colombia, initially known only from the original material. Ten herbarium sheets of this species were found during taxonomic studies of Colombian Viscaceae, allowing to figure out some aspects that remained unclear since P. killipii was published, until now. The morphology of P. killipii fruits and staminate inflorescences is described here for the first time, confirming its generic identity. Evidence of the dioecy of the species and some aspects of its distribution and ecology are also discussed.
Aetanthus alternifolius F.J. Roldán, Carmona, Alzate & J.S. Murillo (Loranthaceae) is newly described and illustrated from the department of Santander in northeastern Colombia. This new mistletoe species, known only from the type locality, is discriminate by its indeterminate shoots, alternate or subopposite, obovate leaves, cymose inflorescences bearing three dyads, flower buds c. 9 cm long, with a finely toothed and sometimes fissured calyculus. Its morphological affinities are discussed especially in relation to A. colombianus A.C. Smith and A. coriaceus Patsch. The rediscovery of original material in P of the poorly known Phyllostephanus engelsii Tiegh. ( Aetanthus engelsii (Tiegh.) Engl.) is discussed. An emended description is provided and a lectotype is designated. An identification key to the ten species of Aetanthus (Eichler) Engl. occurring in Colombia is also presented.
Oryctanthus grammatus es una especie ya descrita en el 2011 en el área biogeográfica del río Magdalena, Colombia, de la cual se conoce únicamente su espécimen tipo, recolectado en 1916 en el departamento de Bolívar. En el presente estudio se reporta un espécimen adicional, encontrado en el departamento de Antioquia 71 años después de su primera recolección, y que constituye el segundo registro para la especie. Se discuten brevemente las afinidades taxonómicas de esta especie y se resalta la importancia de las colecciones históricas para el conocimiento de la biodiversidad.
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