Abstract
Abstract A new species of Ipomoea, thus far endemic to Caatinga domain, is described. The species occurs in a “carrasco” physiognomy - a shrubby vegetation on sandy soils characterized by the presence of cacti and bromeliads. The new species can be recognized by a combination of morphological characters, including a leaf blade with a lanate abaxial surface with long hairs, and sepals lanceolate, acuminate, tomentose, and smooth. A complete description, diagnosis, an identification key for Ipomoea species from the Ibiapaba plateau, illustrations, conservation assessments, a distribution map, and taxonomic comments are provided.
Highlights
Ipomoea lanifolia is known from only two populations and, based on criteria B1a of the IUCN (2012), this species should be considered endangered (EN), even though it occurs in a priority area for biodiversity conservation in the Caatinga domain (MMA 2004) in a protected site on the Ibiapaba plateau (MMA 2004)
Ipomoea lanifolia has been misidentified in herbarium collections from Ceará state as I. brasiliana var. subincana (Choisy) J.R.I
That misidentification may have occurred because both species share strongly discolor leaf blades and tomentose bracteoles and sepals
Summary
Several new species of Convolvulaceae have been described recently for Brazil (Bandeira et al 2017; Wood et al 2017a, 2017b, 2017c; Wood & Scotland 2017d; Santos et al 2019, 2020; Santos et al 2020a,b,c), many of them endemic to the northeastern region of that country (Wood et al 2017a; Santos et al 2019, 2020; Santos et al 2020a,b,c). During a study of the Convolvulaceae of Ceará state, Brazil, field expeditions and analyses of herbarium collections revealed a morphotype of Ipomoea having unusual leaves with a lanate silvery indumentum as well as lanceolate to oblong sepals with acuminate apices. We consulted a recently published monograph citing all Ipomoea species from the Americas (Wood et al 2020) and observed that the combination of those morphological traits did not match any other known species
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