Hoya odorata
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Hoya odorata is a plant of the genus of wax flowers ( Hoya ) of the subfamily of asclepiadoideae (Asclepiadoideae).
features
Hoya odorata is a terrestrial, shrub-like, small plant that rarely climbs somewhat epiphytically . The bare shoots are sparsely branched and densely leafed. Fresh shoots are more or less flexible, older shoots lignify easily. The leaves, which are spread out slightly upwards, have only short stalks. The thin, leathery leaf blades are elliptical to lanceolate-elliptical, 3.5 to 5 cm long and 1.3 to 2.2 cm wide. The apex is drawn out to a point, the base is rounded to wedge-shaped. The leaves are translucent. The midrib is clearly formed. About 6 short secondary ribs each branch off from the midrib. They are bare on the top and bottom. The vegetative parts secrete a white milky juice when injured.
The umbellate inflorescences have only a few flowers. The thread-like, bare flower stalks are about 2 cm long. The sepals are oblong-lanceolate, 0.2 cm long and end blunt. The edges are sparsely covered with cilia. The buds are pentagonal with pronounced ribs where the edges of the petals meet, the corolla measures about 1.7 cm in diameter. The white petals are half fused at the base. The tips are triangular-ovoid, the apices pointed. They are bare on the outside and fine papillae on the inside. The fleshy, egg-shaped corolla lobes are waxy white to greenish-yellow and spread out horizontally, about 4 mm long. The inner process is pointed and ascending, the outer process is very blunt. The anthers are no longer than the inner processes, the edges are membranous. The pollinia are club-shaped and long and narrow, somewhat truncated at the apex. The caudiculae are very short and start at the widest point of the corpusculum. The corpusculum is small and rhombic or dragon-shaped, the widest point is slightly above the middle. In the subspecies loheri , the pollinia are 680 µm long and 200 µm wide. The flowers stay open for about 10 days and have an intense scent of lime and honey. They secrete nectar that tastes sweet.
Similar species
Hoya odorata is similar to Hoya cembra Kloppenb. and Hoya paziae . All three species grow shrub-like rather than epiphytically climbing. It differs, however, by the broad, elliptical, smaller leaves: 3.5 to 5 cm long and 1.3 to 2.2 cm wide. vs. 8 to 10 cm and 2 to 3 cm wide (with Hoya cembra ). The leaves of Hoya paziae are significantly wider in relation to the length (6 to 7 cm long and 2.5 to 3 cm). The flowers are not fragrant. The pollinia of Hoya cembra are shorter in relation to the corpusculum or the corpusculum is much larger, and there are moderately long caudiculae.
Geographical distribution and habitat
The nominate subspecies occurs at Mount Mariveles in Bataan Province , Luzon Island , Philippines. It was collected there in a mountain rainforest at 1,300 m above sea level. The subspecies occur in other localities on the island of Luzon and on the island of Negros .
Taxonomy
The taxon was published by Rudolf Schlechter in 1906 . The holotype was collected by Elmer Merrill in January 1904. It is kept in the Herbarium of the Botanical Garden Berlin under the number # 5650 (# 3202 Jan. 1904). The Plants of the World online accepts the taxon as valid.
The following subspecies of Hoya odorata are currently described.
- Hoya odorata subsp. odorata Schltr.
- Hoya odorata subsp. antoinsensis Kloppenburg (2015), Negros
- Hoya odorata subsp. garciae Kloppenburg (2015), Negros
- Hoya odorata subsp. loheri Kloppenburg (2019), Luzon
- Hoya odorata subsp. miquilingensis Kloppenburg (2018)
- Hoya odorata subsp. rizaliana Kloppenburg (2019), Luzon
- Hoya odorata subsp. taytayensis Kloppenburg (2015), Negros
literature
- Dale Kloppenburg, Ann Wayman: The World of Hoyas - a book of pictures. A revised version. Orca Publishing Company, Central Point, Oregon 2007, ISBN 0-9630489-4-5 , p. 232 brief description and p. 223 photo by Dale Kloppenburg
- Robert Dale Kloppenburg: Dr. Schlechter's Hoya species. Fresno, California, 1993 Online at Biodiversity Heritage Library , pp. 116/17.
- Robert Dale Kloppenburg: Philippine Hoya Species. A monograph. Orca Publishing Co., Medford, Oregon, 2004 Online at Biodiversity Heritage Library , pp. 75/76.
Individual evidence
- ↑ a b website about the genus Hoya by Simone Merdon-Bennack
- ^ Rudolf Schlechter: New Philippine Asclepiadaceae. The Philippine Journal of Science, 1 (Suppl. 4): 295-303, 1906 Online at Biodiversity Heritage Library , p. 303
- ↑ Kew Science - Plants of the World online: Hoya odorata Schltr.
- ↑ IPNI: Hoya odorata Schltr.
- ↑ Robert Dale Kloppenburg: Hoya odorata subsp. antoinsensis Kloppenburg. Hoya New, 4 (2): 21-24, 2015 Online at Biodiversity Heritage Library
- ↑ Robert Dale Kloppenburg: Hoya odorata subsp. garciai Kloppenburg. Hoya New, 4 (2): 25-27, 2015 Online at Biodiversity Heritage Library
- ↑ Robert Dale Kloppenburg: Hoya odorata subsp. loheri Kloppenburg 2019. Hoya New, 9 (3): 5-8, 2019 Online at Biodiversity Heritage Library
- ↑ Robert Dale Kloppenburg: Hoya odorata subsp. miquilingensis Kloppenburg 2019. Hoya New, 8 (4): 7-8, 2018 at Biodiversity Heritage Library
- ↑ Robert Dale Kloppenburg: Hoya odorata subsp. rizalina Kloppenburg 2019. Hoya New, 9 (3): 3-4, 2019 Online at Biodiversity Heritage Library
- ↑ Robert Dale Kloppenburg: Hoya odorata subsp. taytayensis Kloppenburg. Hoya New, 4 (2): 17-20, 2015 Online at Biodiversity Heritage Library
Web links
- Vermont Hoyas (picture of a flower)
- Top Tropicals (pictures of flowers and inflorescences)
annotation
- ↑ The pollinaries of the individual subspecies differ z. T. considerably from the pollinarium of the nominal subspecies and the question arises whether the 6 subspecies really all belong to Hoya odorata . For example, the pollinarium of Hoya odorata subsp. garciai in the dimensions, proportions of the pollinia to the corpusculum, and the shape of the corpusculum more similar to Hoya cembra than to Hoya odorata .