Hoya cembra
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Hoya cembra is a plant of the genus of wax flowers ( Hoya ) of the subfamily of asclepiadoideae (Asclepiadoideae).
features
Hoya cembra is a terrestrial, shrub-like plant that rarely climbs somewhat epiphytically . The shoots are not very branched, but have lush leaves. They are bare and flexible and measure up to about 5 mm in cross section; older shoots are a bit stiffer. The internodes are about 4 cm long. The slightly upwardly directed, spreading leaves are stalked, the petioles are short, only about 0.5 cm long. The stalks are deepened at the top. The thin but firm, leathery leaf blades are narrowly elliptical, 8 to 10 cm long and 2 to 3 cm wide. The apex is pointed to beaked, the base is rounded to flat wedge-shaped. The leaves are slightly translucent, the top and bottom are bare. The midrib stands out clearly. There are 5 or 6 secondary ribs each starting from the central rib.
The inflorescence usually contains only a few flowers. The thread-like flower stalks are bare and measure 2.5 cm in length. They arise from the nodes. The sepals are elongated-lanceolate, the apex blunt. There are cilia on the outside. The white corolla has a diameter of 1.8 cm. The triangular petal lobes are spread out in a wheel shape or slightly curved upwards. The tips are fused in the basal third. The apex is pointed, the tips are again curved back. They are bald on the outside and hairy on the inside. The secondary crown is yellowish green. The ovate corolla lobes are fleshy and spread out horizontally. The inner process is narrow and pointed long. The outer process is blunt-rounded, and runny on the outer two-thirds. The anthers attachments protrude beyond the inner process. The pollinaries have relatively short, winged pollinia , moderately long caudiculae and a comparatively broad, rhombic corpusculum with a double point at the lower end.
Similar species
Hoya cembra is similar to Hoya odorata Schltr. and Hoya paziae . All three species grow shrub-like rather than epiphytically climbing. It differs, however, in the narrow, elliptical, larger leaves: 8 to 10 cm and 2 to 3 cm wide. vs. 3.5 to 5 cm long and 1.3 to 2.2 cm wide ( Hoya odorata ) or 6 to 7 cm long and 2.5 to 3 cm ( Hoya paziae ). The leaves of Hoya paziae are not only slightly smaller, but also significantly wider in relation to their length. The pollinia of Hoya cembra are shorter in relation to the corpusculum, and the caudiculae are much longer than those of Hoya odorata and Hoya paziae . They start almost directly at the corpusculum.
Geographical distribution and habitat
The species is so far only known from the type locality on the Alag River, Mindoro Island , Philippines . It grew there in thickets at 300 m above sea level.
Taxonomy
The taxon was described in 1990 by Robert Dale Kloppenburg . The taxon is based on a herbarium sheet of a plant that Elmer D. Merrill had collected on Mindoro in November 1906 and had given to Rudolf Schlechter for description. Worse wanted to call the species Hoya leucantha , but it was never published. The specimen is kept in the herbarium of the Botanical Garden Berlin under the number # 5650. The Plants of the World online database accepts Hoya cembra as a valid taxon.
Robert Dale Kloppenburg named the species after his daughter Cembra, which he named after the stone pine ( Pinus cembra ).
literature
- Robert Dale Kloppenburg: Philippine Hoya Species. A monograph. Orca Publishing Co., Medford, Oregon, 2004 Online at Biodiversity Heritage Library
- Anders Wennström, Katarina Stenman: The Genus Hoya - Species and Cultivation. 144 p., Botanova, Umeå 2008 ISBN 978-91-633-0477-4 (p. 41)
Individual evidence
- ↑ a b Robert Dale Kloppenburg: Hoya cembra Kloppenburg sp. nov. Fraterna, 1 (3, Suppl.): II, 1990. Online at Biodiversity Heritage Library
- ↑ Kew Science - Plants of the World online: Hoya cembra Kloppenb.