Abstract
A new species of Hoya R.Br. from Mindanao (Philippines), Hoya migueldavidii Cabactulan, Rodda & Pimentel, is described and illustrated. It is a member of Hoya section Acanthostemma (Blume) Kloppenb. that is particularly speciose in the Philippines.It is compared with the similar Hoya loheri Kloppenb, also endemic of the Philippines, from which it differs in indumentum of the vegetative parts (pubescent vs. glabrous), the shape of the corolla (almost spherical vs. partly flattened) and the type of gynostegium (not stipitate vs. stipitate)
Highlights
Hoya R.Br., with an estimated 350–450 species (Rodda 2015) is the largest genus of Apocynaceae
New Guinea has 85 species and one subspecies (Forster 1996, Simonsson Juhonewe and Rodda 2017), mostly described in the first half of the last century, the majority of which described by Schlechter (1913) based on his own collections
The majority of the recent publications of new Philippine Hoya species are based on collections from Luzon and several parts and islands in Visayas and fewer from Mindanao
Summary
Hoya R.Br., with an estimated 350–450 species (Rodda 2015) is the largest genus of Apocynaceae. The steep increase in species number is almost entirely due to the establishment of the e-journal Hoya New, where Dale Kloppenburg started publishing new taxa since 2013 either as sole author or in collaboration with numerous Philippine botanists and growers. In comparison to the two other centres of diversity of Hoya, Borneo and New Guinea, the pattern of species discovery and description in the Philippines is very different.
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