Perenne, fere glabrum, scandens, internodiis ad 13 cm. longis, vel erectum, internodiis abbreviatis, cortice pallido, polito; folia reniformia vel orbicularia, basi cordata vel truncata, obscure 4-5-lobata, marginibusPerenne, fere glabrum, scandens, internodiis ad 13 cm. longis, vel erectum, internodiis abbreviatis, cortice pallido, polito; folia reniformia vel orbicularia, basi cordata vel truncata, obscure 4-5-lobata, marginibus irregulariter dentata, zona inconspicua vel interdum invisa saepius 3.5-4.5 cm., rarius ad 6.7 cm., diam., petiolis 2-3.5 cm. longis, stipulis ovato-orbicularibus acuminatis, ad 9 mm. longis; pedunculi ad 22 cm., saepius 6-13 cm., longi, cymis 8-12-fl., pedicellis glandulosis parceque pubescentibus, ad 4.2 cm. longis; sepala 5, posterius erectum, anteriora recurvata, lineari-lanceolata acuminata, lateralibus ceteris angustioribus, 1-1.2 cm. longa, nectario pedicello parum breviore; petala 5, posteriora erecta, paginis intertioribus oppositis approximatisque, e medio divergentia, 3 anteriora recurvata, omnia laete corallino-rubra, inconspicue rubro-lineata, inter se aequilonga similiaque, linearia, inferne parum angustata, obtuse, 3.3 cm. longa, ad 5 mm. lata; tubus staminum 4 mm. longus, filamentis valde, inaequilongis, 2 ad 1 cm. longis, antheris polliniferis 4-6; carpella 1.4 cm. longa, inferne dense vellosa.
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