Convolvulaceae neotropicae novae vel minus cognitae Jacquemontia austiniana JRGrande sp. nov. (Convolvulaceae), a new species from the Venezuelan Guayana

As a part of a taxonomic update of the family Convolvulaceae Juss. for Guayana Shield, the species Jacquemontia austiniana J.R.Grande sp. nov., is described and illustrated as new to science. This species is characterized by its linear-subulate bract, ovate-lanceolate external sepals, conspicuously acuminate, villose, with the margins ciliate, and a relatively large and infundibulifonn corolla. To date, this is the only species or Jacquemontia Choisy endemic to the Guayana Shield; its relationships within the genus are still to be elucidated.