29th Mexican studies on Rubiaceae. Arachnothryx sanchezii (Guettardeae) and Bouvardia mitlensis (Spermacoceae), new species from Oaxaca [Estudios sobre Rubiaceas Mexicanas, XXIX. Arachnothryx sanchezii (Guettardeae) y Bouvardia mitlensis (Spermacoceae) nuevas especies de Oaxaca]

摘要

Two new species of the family Rubiaceae were collected by the members of the Society for the Study of Biotic Resources of Oaxaca (SERBO) in the state Oaxaca (México). One of them is the Arachnothryx sanchezii shrub with scandent twigs and broadly spiked inflorescences, related to A. heteranthera, belonging to the Guettardeae tribe according the new molecular studies of Rova et al. (2009). The other species is Bouvardia mitlensis, a low dense shrub with small leaves and plentiful small white flowers belonging to the Bouvardioides section, near to B. erecta and B. rosei.