Tuesday, June 6, 2017

[Botany • 2017] Hoya migueldavidii • A New Species (Apocynaceae, Asclepiadoideae) from Northern Mindanao, Philippines [Hoya of the Philippines part I]


Hoya migueldavidii  Cabactulan, Rodda & Pimentel


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)

Keywords: Acanthostemma, Marsdenieae, waxflower


Figure 1: Hoya migueldavidii photographed from R. Pimentel s.n. (CMUH) prior to pressing
A A single flower, front view B, C Corolla, side view D Corolla, with removed corona E Revolute margins of the corolla lobes F Corona, from underneath G, H Pedicel, calyx and ovary I Pollinarium
(Photographs by M.D de Leon)
DOI: 10.3897/phytokeys.80.12872

Figure 2: Hoya migueldavidii photographed from R. Pimentel s.n. (CMUH) prior to pressing
A Inflorescence B Branch C, D leaf (C adaxial surface D abaxial surface). (Photographs by M.D de Leon).

Figure 1: Hoya migueldavidii photographed from R. Pimentel s.n. (CMUH) prior to pressing A A single flower, front view B, C Corolla, side view D Corolla, with removed corona E Revolute margins of the corolla lobes F Corona, from underneath G, H Pedicel, calyx and ovary I Pollinarium (Photographs by M.D de Leon)
Figure 2: Hoya migueldavidii photographed from R. Pimentel s.n. (CMUH) prior to pressing A Inflorescence B Branch C, D leaf (C adaxial surface D abaxial surface). (Photographs by M.D de Leon). 

Hoya migueldavidii Cabactulan, Rodda & Pimentel, sp. nov.

 Diagnosis: Among Philippine Hoya species similar to Hoya loheri in inflorescence type (positively geotropic, convex) but separated because Hoya loheri has a flattened, turban-shaped corolla (vs. almost round in Hoya migueldavidii) and leaves and stems are entirely glabrous (vs. pubescent in Hoya migueldavidii)

Figure 3. Hoya loheri photographed from Rodda M MR748 (SING) prior to pressing A Leafy branch and inflorescence B Inflorescence. (Photographs by M. Rodda) 

Type: Philippines, Mindanao, Bukidnon, Mount Kitanglad, 11 Aug 2016, R. Pimentel s.n. (CMUH, holotype, sheet number CMUH 827; SING, isotype).

Etymology: Hoya migueldavidii is named after Dr. Miguel David de Leon, viteoretina surgeon and plant and wildlife conservationist.

Distribution and ecology: This new species was only once collected in Mindanao Island, Philippines but the full distribution is still unknown. It is an epiphytic climber, growing at about 1000 m in disturbed primary broad leaf forest in full sun to part shade.


Derek D. Cabactulan, Michele Rodda and Reynold Pimentel. 2017. Hoya of the Philippines part I. Hoya migueldavidii (Apocynaceae, Asclepiadoideae), A New Species from Northern Mindanao, Philippines. PhytoKeys. 80; 105-112.    DOI: 10.3897/phytokeys.80.12872

 

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