Monographs Details: Mandevilla thevetioides Markgr.
Authority: Maguire, Bassett. 1969. The botany of the Guayana Highland-part VIII. Mem. New York Bot. Gard. 18: 1-290.
Family:Apocynaceae
Description:Distribution and Ecology - BRAZIL. Amazon River Basin: Rio Caqueta (= Yapura) (State of Amazonas,Repubhc of Colombia), frequent in Araracuara savannas (fl), 9 Jun 1959, BassettMaguire, Celia K. Maguire, & Alvaro Fernandez 44170 (holotype N Y ; isotypesCOL, US, V E N , Z).

Discussion:

Frutex erectus, latice abundans. Rami erecti vel arcuato-ascendentes, glabri, anguste bialati. Folia opposita vel ternato-verticillata, subcoriacea, glabra, nitidula, petiolus 3-4 m m longus, lamina lineari-lanceolata, 70-90 X 5-15 mm, apice acuta, basi auriculata, margine revoluta; costa supra impressa et glandulis pluribus ornata, subtus late prominula, nervi secundarii patuli, non arcuati, numerosissimi. Inflorescentiae terminales, racemosae, glabrae, carnosulae, ad 10-florae, in statu florif ero folio suffulcrante longiores. Bracteae scariosae, oblongae, 2 m m longae. Pedicelli crassiusculi, 3 m m longi. Lobi calycis triangulari-ovales, acuti, extus ut pedicelli iuniores papillosi, 1.5 m m longi et lati, ciliolati, intus squamuhs latis pectinatis unilateraliter instructi. Corolla infundibuliformis, rosea, glabra, tubus inferior leviter arcuatus, 35 m m longus, 2-3 m m latus, intus longe deorsum setosus, tubus superior 30 m m longus, in fauce ad 20 m m ampliatus, lobi oblique ovati, 20 X 12 m m . Stamina basi tubi superioris inserta, oblonga, obtusiuscula, basi auriculata, apice incurva, capiti stigmatis umbraculiformi, quinque-sulcato, breviter apiculato arete agglutinata. Ovarium apocarpum, glabrum, oblongum, 2 m m altum, biloculare, multiovulatum. Discus cupularis, leviter quinque-lobatus, vix 1 m m altus. Fructus desunt.

This new species belongs to a group represented in the highlands and mountains of northern South America, from the Guianas to the Andes. They all have more or less winged twigs and erect habit. In the monograph of R. E. Woodson they are found united already as advanced types, of his subgenus Exothostemon (Ann. Missouri Bot. Gard. 20: 770-776. 1933). As to leaf shape, our species comes nearest to M. lancifolia Woodson, from the Orinoco River, and to M . benthamii (DC.) K. Schum., from British Guiana, the flowers of which, however remain smaller and are said to be yellowish, and the leaves shorter and narrower.

Distribution:Brazil South America|