Hoya campanulata
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Illustration of Hoya campanulata flower (from Edwards' Botanical Register, Volume 33, Plate 54, 1847) |
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| Hoya campanulata | ||||||||||||
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Hoya campanulata is a plant of the genus of wax flowers ( Hoya ) of the subfamily of asclepiadoideae (Asclepiadoideae).
features
Hoya campanulata is an initially hanging, later climbing, epiphytic plant with round, only 0.3 cm thick, thread-like and bare shoots in cross section . The plant becomes about 1.2 to 1.8 m long. The leaves sit on short stems. The very thin, non-succulent leaf blades are elliptical-lanceolate, 7 to 11 cm long, 2.5 to 5 cm wide (12 cm long and 5 cm wide or 15 cm long and 5 cm wide), the apex is pointed. They are dark green in color, with silver-colored speckles and clearly visible veins. The top and bottom are bare.
The umbel-like inflorescence with a long stalk hangs down with a straight edge. It has 12 to 25 individual flowers (up to 10 individual flowers). The rather large, hanging corolla with a diameter of 2 to 3 cm (2 cm or 2.5 cm) is broadly bell-shaped. The petals are almost completely fused laterally; only five short wedge-shaped notches can be seen on the outer edge of the "bell". The tips of the petals are only slightly bent outwards with a short point in the middle. The color varies from white, light green to cream (bone white). The secondary crown is whitish with five purple dots around the center. The tips of the secondary crown are 4.5 to 5.5 mm long and 1.5 to 2 mm wide. They lie flat in the broad, bell-shaped corolla. Viewed vertically from above, the anthers form a disc that reaches about a quarter of the length of the corolla lobes.
The number of chromosomes is 2n = 22.
ecology
The flowers produce little or no nectar and smell strongly of lime in the evening. The degree of opening of the flower varies. The flowers stay open for 8 days. In the natural habitat, it blooms all year round.
Similar species
Hoya campanulata is closely related to Hoya danumensis Rodda & Nyhuus from Borneo , and to Hoya vacciniiflora from West Borneo. The flower of Hoya danumensis is larger on average with five characteristic nodular bulges on the outside near the base of the petals on the peduncle and between the sepals. In Hoya danumensis, the tips of the secondary crown are 4.5 to 5.5 mm vs. 5.5 to 6 mm slightly longer and with 2.4 to 2.6 mm vs. 1.5 to 2 mm also significantly wider. In Hoya vacciniiformis , the flowers are urn-shaped to bell-shaped and significantly smaller with a diameter of up to 1.4 cm. The leaves are oblong-lanceolate and succulent. In Hoya campanulata , the disc that is formed by the anthers in the corolla (when viewed vertically from above) only reaches a quarter of the length of the corolla lobes , in Hoya danumensis it is one third and in Hoya vacciniiformis the diameter and length of the corolla lobes are the same.
Geographical distribution and habitat
The species occurs in West Malaysia (Malay Peninsula), Borneo and Indonesia (Java and Sumatra). Somadee & Kühne also name the Philippines as a distribution area. It grows there in tropical lowland forests.
Taxonomy
The species was first described by Carl Ludwig Blume . The type location is Java. The specific epithet refers to the bell-shaped flowers.
Individual evidence
- ↑ Dave's Garden
- ↑ a b c Michele Rodda, Torill Nyhuus: Hoya danumensis, a new species of Hoya (Apocynaceae, Asclepiadoideae) from Borneo. Webbia, Journal of Plant Taxonomy and Geography, 64 (2): 163-167, 2009 doi : 10.1080 / 00837792.2009.10670856
- ↑ a b c d e Surisa Somadee and Jens Kühne: Hoya 200 different wax flowers. 96 p., Formosa-Verlag, Witten 2011 ISBN 978-3-934733-08-4 (p. 34)
- ↑ a b c d Anders Wennström and Katarina Stenman: The Genus Hoya - Species and Cultivation. 144 p., Botanova, Umeå 2008 ISBN 978-91-633-0477-4 (p. 36)
- ↑ Hoya campanulata at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
- ^ A b Richard E. Rintz: The Peninsular Malaysian Species of Hoya (Asclepiadaceae). The Malayan Nature Journal 30 (3-4): 467-522, 1978
- ↑ Carl Ludwig von Blume: Bijdragen tot de Flora van Nederlandsch Indië , 16: 16-17: 943-1169, Batavia / Jakarta, Ter Lands Drukkerij (Oct 1826-Nov 1827) online at www.biodiversitylibrary.org (p. 1064 / 5)
- ↑ Online at www.biodiversitylibrary.org (page / plate 54)
