Short Communication: Two new species and new record of Psydrax Gaertn. (Rubiaceae: Vanguerieae) in Borneo

Mahyuni R, Chikmawati T, Ariyanti NS. 2019. Short Communication: Two new species and new record of Psydrax Gaertn. (Rubiaceae: Vanguerieae) in Borneo. Biodiversitas 20: 2011-2015. Psydrax sabahensis Mahyuni and P. wongii Mahyuni are two new species endemic to Borneo proposed in this present study with descriptions, illustrations and map of distribution provided. Psydrax sabahensis has blades ovate to elliptic, with angle 60º to the midrib, tertiary venation conspicuous on both side, petiole length 10-13 mm long, inflorescence sub-umbellate and pedicels 23-27 mm long. Psydrax wongii has blade elliptic, with angle 45º to midrib, apex acuminate to caudate, secondary veins 3-4 pairs, tertiary venation inconspicuous on upper side and slightly wrinkled on lower surface. The presence of P. maingayi (Hook.f.) Bridson in Borneo, previously thought to be a Malay Peninsula endemic species, is also confirmed as a new record.

Novelties in neotropical Dilleniaceae

A new species of Doliocarpus (Dilleniaceae), Doliocarpus putumayensis Aymard from the Porvenir River (affluent of the lower Putumayo River), and the middle Caquetá River in the state of Amazonas was found during the examination of specimens for the Dilleniaceae treatment for the Flora de Colombia. This species is not clearly related to any other Doliocarpus species, however, it shows certain similarities with D. magnificus Sleumer in its leaves size, shape, and the fruit size and pubescence. Nonetheless, P. putumayensis differs in its tertiary venation, inflorescence size, sepal number and shape, anthers glabrous with a connective broadened, and fruit densely adpressed pubescent. An updated key to the species of Doliocarpus of Colombia is provided, and a previously described subspecies from Brazil is elevated to the rank of species (i.e., Doliocarpus brevipedicellatus Garcke subsp. hilarianus Kubitzki to D. hilarianus Aymard).