Abstract
Abstract A new species of Apocynaceae, Ruehssia quirinopolensis, endemic to Serra da Confusão do Rio Preto and Serra da Igrejinha, Quirinópolis, state of Goiás, Brazil, is described and illustrated. It resembles R. rupestris, differing by the white corolla, adaxially villose and with a longer tube, and by its corona lobes with the upper portion lanceolate. Besides a distribution map for the new species, we provide a key to identify the nine species of Ruehssia that occur in Goiás. Ruehssia quirinopolensis is assessed here as Critically Endangered (CR).
Highlights
The Apocynaceae comprise around 5,350 species and more than 370 genera (Endress et al 2018)
In Gentianales, the family is recognized by the presence of latex, a gynoecium with two carpels free at the ovary level but fused towards the apex to form a style-head, and a remarkable gradual synorganization of floral structures, culminating with the gynostegium and the pollinaria: the gynostegium arises from the post-genital fusion of the androecium to the style-head and pollinaria are the pollen units of Periplocoideae, Secamonoideae and Asclepiadoideae (Rapini 2012)
In November 2018, we found plants of this population in Quirinópolis with flowers; this allowed as to recognize another undescribed specie from the Cerrado domain
Summary
The Apocynaceae comprise around 5,350 species and more than 370 genera (Endress et al 2018). Resumo Uma nova espécie de Apocynaceae, Ruehssia quirinopolensis, endêmica da Serra da Confusão do Rio Preto e Serra da Igrejinha, Quirinópolis, estado de Goiás, Brasil, é descrita e ilustrada. Ruehssia can be recognized among the neotropical Asclepiadoideae by the erect pollinia, as it represents the only American lineage of the clade Ceropegieae-Marsdenieae (Espírito Santo et al 2019).
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