Hoya flavescens
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Hoya flavescens is a plant of the genus of wax flowers ( Hoya ) of the subfamily of asclepiadoideae (Asclepiadoideae).
features
Hoya flavescens is an epiphytic , climbing subshrub with thread-like, flexible shoots. The shoots, which are round in cross-section, are branched but not very leafy. The leaves are stalked, the petioles are 0.5 to 1.5 cm long and thickly fleshy. They are deepened on the upper side. The spread, slightly fleshy leaf blades are oblong or lanceolate-oblong, and 10 to 16 cm long and in the middle 3.7 to 4.3 cm wide. The apex is pointed, the base is approximately wedge-shaped to rounded. The top has a longitudinal groove.
The umbel-shaped inflorescence contains 10 to 20 flowers. The peduncle and pedicels are graceful and glabrous. The inflorescence stalk is 5.5 to 6.5 cm long, the flower stalks are up to 1.7 cm long. The outside bare sepals are ovate, approx. 1.5 mm long and blunt. The corolla measures approx. 1.6 cm in diameter. It is wheel-shaped, bare on the outside, dense on the inside and finely papillary. The petal lobes are egg-shaped and blunt-pointed. The edges are bent back. The secondary crown are spread out horizontally. The corolla lobes are 0.3 cm long and hairy downy. They are spread out horizontally. The outer process is blunt, the inner elongated-elliptical process blunt-pointed. The pollinia are elongated with an obliquely inwardly sloping apex. The caudiculae are very short. The corpusculum is rhombic and is only one third the length of the pollinia.
Similar species
The flowers resemble those of Hoya ischnopus Schltr. The corolla is somewhat smaller, and the petal lobes are only partially papilose; The base and middle are bare. Hoya marginata Schltr. vom Bismarck Archipelago also has flowers that are densely hairy on the edges and otherwise papilose on the inside. However, this species has narrower and smaller leaves. The corolla lobes are much wider. Simone Merdon-Bennack also lists Hoya kenejiana as very similar.
Geographical distribution and habitat
The species occurs in the Kani Mountains in Papua New Guinea . She found it worse in trees about 800 m above sea level. Rudolf Schlueter found the species blooming in April 1908.
Taxonomy
The taxon was described by Rudolf Schlechter in 1913 . The holotype is kept in the herbarium of the Botanical Garden in Berlin under the number Schlechter n.17.623 . The Plants of the World online accepts Hoya bandaensis as a valid taxon.
According to an investigation of the Hoya species of New Guinea by the botanists Nathanielle Simonsson Juhonewe and Michelle Rodda in 2017, Hoya flavescens forms with a number of very similar species, all of which are endemic to New Guinea ( H.dimorpha FMBailey, H.dischorensis Schltr., H.kenejiana Schltr ., H.montana Schltr.), The ischnopus species complex. Future studies will have to clarify whether the status of independent species is justified or whether it is one or more polymorphic species.
literature
- Robert Dale Kloppenburg: Dr. Schlechter's Hoya Species. Fresno, 1993 Online at Biodiversity Heritage Library , p. 64.
- Rudolf Schlechter: The Asclepiadaceae of German New Guinea. Botanical Yearbooks for Systematics, Plant History and Plant Geography, 50: 81-164, 1913. Online at Biodiversity Heritage Library , p. 112.
Individual evidence
- ↑ Website about the genus Hoya by Simone Merdon-Bennack: Hoya flavescens Schlechter 1913
- ^ Kew Science - Plants of the World online: Hoya flavescens Schltr.
- ↑ N. Simonsson Juhonewe & M. Rodda (2017): Contribution to a revision of Hoya (Apocynaceae: Asclepiadoideae) of Papuasia. Part I: ten new species, one new subspecies and one new combination. Garden's Bulletin Singapore 69 (1): 97-147. doi: 10.3850 / S2010098116000093