%0 Journal Article
%T Botanical novelties from Sierra de Maigualida, southern Venezuela. I
%A Nozawa
%A Shingo
%A Grande
%A Jos¨¦ R.
%A Huber
%A Otto
%J Anales del Jard¨ªn Bot¨¢nico de Madrid
%D 2010
%I Consejo Superior de Investigaciones Cient¨ªficas
%X The almost unexplored Sierra de Maigualida is the largest and highest non sedimentary, granitic mountain system in the Guayana Shield. Because of its particular geological constitution, a surprisingly large number of new plant taxa has been found in its high mountain ecosystems. In this first installment, two new species, Sauvagesia cryptothallis (Ochnaceae) and Aegiphila uasadiana (Lamiaceae) are described and illustrated. Sauvagesia cryptothallis belongs to Sauvagesia sect. Imthurnianae and is closely related to S. imthurniana, differing mainly in the axis of the inflorescence being densely covered by 5-8 tightly overlapping bracts, hiding the entire axis, and with the principal and secondary leaf veins almost flat, not salient on the lower surface, and poorly differentiated from tertiary veins. Aegiphila uasadiana is a very distinctive species somewhat similar to A. luschnathii, from Brazil. It can be distinguished by its leaves that are coriaceous, conspicuously revolute, entire, shiny, gla brescent, conspicuously bullate, and foveate adaxially; the inflorescences that are relatively compact and crowned at the apex of the twigs; the calices that are adpressed-pubescent, densely so at the base, progressively glabrescent towards the apex, truncate apex, 4-apiculate, each apiculi of ca. 0.4 mm long, and stamens that are largely exserted from the corolla. La casi inexplorada Sierra de Maigualida es el sistema monta oso no sedimentario gran¨ªtico m¨¢s extenso y alto del Escudo Guayan¨¦s. En sus ecosistemas altimontanos se ha encontrado un elevado n¨²mero de t¨¢xones nuevos para la ciencia, gracias a su constituci¨®n geol¨®gica particular. En esta primera entrega se describen e ilustran dos nuevas especies, Sauvagesia cryptothallis (Ochnaceae) y Aegiphila uasadiana (Lamiaceae). Sauvagesia cryptothallis pertenece a Sauvagesia secci¨®n Imthurnianae y es muy af¨ªn a S. imthurniana, de la cual difiere principalmente en el eje de la inflorescencia densamente cubierto por 5-8 br¨¢cteas, sin dejarlo ver, y hojas con los nervios principales y los secundarios planos, sin sobresalir en el lado abaxial, pobremente diferenciados de los nervios terciarios. Aegiphila uasadiana es una especie bastante particular, la cual presenta cierta similitud con A. luschnathii, de Brasil. Se puede diferenciar por presentar hojas enteras cori¨¢ceas, revolutas, con haz lustroso, glabrescente, densamente bulado y fuertemente foveado; inflorescencias agrupadas en el ¨¢pice de las ramas, relativamente compactas; c¨¢liz adpreso-pubescente, densamente en la base y progresivamente glabrescente hacia el
%K Aegiphila
%K Guayana Highland
%K Guayana Shield
%K Guiana Shield
%K Lamiaceae
%K Ochnaceae
%K Pantepui
%K Sauvagesia
%K taxonomy
%K Aegiphila
%K Escudo Guayan¨¦s
%K Lamiaceae
%K Ochnaceae
%K Pantepui
%K Sauvagesia
%K taxonom¨ªa
%K tierras altas de la Guayana
%U http://rjb.revistas.csic.es/index.php/rjb/article/view/352/347