Hoya macgillivrayi
Hoya macgillivrayi, inflorescence
Hoya macgillivrayi is a species of the genus of wax flowers ( Hoya ) of the subfamily of milkweed plants ( Asclepiadoideae ). The species is endemic to the Iron and McIlwraith Ranges of eastern Cape York Peninsula in the north of the Australian state of Queensland. The Artepithet honors the physician and naturalist William David Kerr Macgillivray ( 1867-1933 ).
- 4.1 Literature
- 4.2 Notes and references
Features
Hoya macgillivrayi is an epiphytic, rarely on stones growing, twining plant with cylindrical, 5 mm measured in diameter, bare branches. All parts of the plant contain a white milky sap. The egg-shaped to lanceolate leaf blades sit on a 2 to 3.5 cm long and 2-5 mm thick stalk. The base of the leaf blade is heart-shaped, pointed, the outer end. They measure 15 to 20 cm in length and 2.5 to 8 cm in width. The leaves are opposite arranged bare and succulent. Young leaves are copper-colored, older leaves dark green. The internodes measure about 20 cm.
The inflorescence contains up to 12 individual flowers (6 to 10). It forms at the internodes. Green to yellowish inflorescence stems are 4 to 20 cm long with a thickness 1 to 2 millimeters. The cup-shaped flowers have a diameter of 5.5 to 8cm. They sit on 5.4 to 8.5 mm long, green, leafless stems. The sepals are pointed apexes, 3 to 4 mm long at the base and about 2 mm wide. The flowers are uniformly dark red or even white in the center. The Kronblattzipfel are 2 to 2.5 cm long and 1.9 to 2.3 mm wide. The run out of pointed, the margins are strongly bent. The corona has about 1.8 to 2.4 cm in diameter and is about 1 cm high. It is dark and bare. The staminal Nebenkronzipfel are 10 to 12 mm long and 2-3 mm wide. The inner, pointed appendage is 5 - 10 mm long and ascending. The outer extension is breieiförmig to pointed and only weakly ascending. The appendages of the stamens are 2.5 mm long and pointed. The stylus head measures approx. 3 mm in diameter. The oblong pollinia measure 1.4 mm in length and 0.45 mm in width. The corpuscle has the following dimensions: 0.8 mm long, 0.5 mm wide; the Caudiculae measure 0.4 mm in length and 0.2 mm in width. The flowers smell strongly and hold for about ten days. The paired hanging fruit and are 15 to 19 cm long (up to 25 cm) and have a diameter of 1.5 cm.
Similar Species
Hoya macgillvrayi is closely related to three types: related Hoya archboldiana C. Norman, Hoya mega vicious Warburg and Hoya onychoides PI Forster DJ Liddle & IM Liddle from New Guinea. All four species have very large flowers, but they differ somewhat in flower size and especially the flower shape.
The species is endemic to the Iron Range McIlwraith Range area (National Park) of the Cape York Peninsula in the north of the Australian state of Queensland. In the local monsoon rainforests she climbs up in the canopy or in trees along open streams.
Taxonomy
Hoya macgillivrayi in 1914 by Frederick Manson Bailey ( 1827-1915 ) in the Queensland Agricultural Journal, New Series, Volume, p.190 first published. As a type locality of the Claudie River near its confluence with the Lloyd Bay ( Queensland, Australia) has been specified. The type specimen was collected by the physician Dr. William David Kerr Macgillivray. Synonyms are not known. Your spectacular blooms are among the largest flowers in the genus of wax flowers. It is already for some time in culture, and trade in addition to some naturally occurring clones also quite a number of cultivars are available.