Hoya australis
| Hoya australis | ||||||||||||
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Hoya australis subsp. australis |
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| Scientific name | ||||||||||||
| Hoya australis | ||||||||||||
| R.Br. ex J.Traill |
Hoya australis is a kind of complex of the type of wax flowers ( Hoya ) of the subfamily of asclepiadoideae (Asclepiadoideae).
features
Hoya australis has twisting, succulent, little branching shoots that become more or less lignified with age. Young shoots are hairy, older ones glabrous. The shoots can be 3 to 7 m long. Most of the subspecies are climbing. The opposite leaves are stalked, the stems are 1.5 to 3 cm long. The leaf blades are elliptical, oblong ovoid to circular. are mostly succulent or leathery (with subsp. tenuipes ). The size of the leaves varies, depending on the subspecies, from less than 5 cm in length (subsp. Sanae ) to 15 cm in length or 4 to 9 cm in width. The leaf margins are more or less bent and / or wavy depending on the subspecies. The leaf veins are pinnate. They are downy hairy on the top and bottom.
The umbel-shaped inflorescence consists of up to 50 flowers and hangs down. The surface is convex, the diameter is 5 to 6.5 cm. The persistent stalk of the inflorescence is 1 to 3 cm long, glabrous or hairy. The flower stalks are 2 to 4 cm long, the sepals oval to nearly triangular and little to densely hairy. They are 1 to 5 mm long and 1 to 3 mm wide. The corolla measures about 1 to 2.5 cm in diameter; it is cream-colored to white and colored red at the base. The corolla lobes are oval-rounded, pointed at the end. They are bare inside and out. The edges are bent over. They measure 5 to 19 mm by 3 to 7 mm. The secondary crown is cream-colored. The staminal corolla lobes are oval, concave on the top and provided with a groove on the bottom. The outer extension is approximately round, the inner extension is pointed. The pollines measure 800 µm in length and 300 µm in width. The apical end is rounded, the basal part shows a small, lateral swelling. A laterally attached membranous skin ( wing ) extends well over half the dorsal length. The corpusculum is egg-shaped, approx. 400 µm long and 200 µm wide. Two short support elements are attached to the basal area. The caudiculae (translator arms) are approx. 200 µm long with a diameter of 80 µm. They have no membrane on the side or are wingless .
The spindle-shaped fruits measure 9 to 13.5 cm in length and 1 to 1.5 cm in diameter. The seed is elongated (5 to 7 mm x 2 to 3 mm) with a 2.5 to 3 cm long tuft of hair. The number of chromosomes is 2n = 22.
Geographical occurrence
The species occurs in Indonesia (Sulawesi), Malaysia ( Sabah ), Australia , Fiji , New Caledonia , Papua New Guinea , Solomon Islands , Samoa , Tonga and Vanuatu .
Systematics
Hoya australis is described by Hoffmann et al. divided into five subspecies in Albers and Meve (2002):
- Hoya australis subsp. australis , climbing, succulent, large leaves (15 × 12 cm) with slightly bent edges, little to densely hairy. Occurrence: Australia (Queensland, New South Wales), Samoa and Vanuatu , Sabah.
- Hoya australis subsp. melanesica P.I. Forest. & Liddle : Solomon Islands to the islands of the Southwest Pacific.
- Hoya australis subsp. nathalieae Kloppenb. & Siar : New Guinea.
- Hoya australis subsp. oramicola P.I. Forest . & Liddle , climbing, leaves succulent, longer than 5 cm, edge strongly bent, little to densely hairy. Occurrence: Australia ( Northern Territory )
- Hoya australis subsp. rupicola (KDHill) PIForest. & Liddle (Syn .: Hoya rupicola (KDHill) PIForst. & Liddle ): Not climbing, leaves strongly succulent, margins slightly bent, densely hairy. Occurrence: Australia (Northern Territory)
- Hoya australis subsp. sana (FMBailey) KDHill , climbing, leaves succulent, smaller than 5 cm, the edges are strongly bent, little to densely hairy. Occurrence: Australia ( Queensland )
- Hoya australis subsp. tenuipes (KDHill) PIForst. & Liddle , climbing, leaves leathery, margins slightly bent, glabrous to not very hairy. Occurrence: Indonesia ( Western New Guinea ), Papua New Guinea , Australia (Queensland), Fiji Islands, Solomon Islands and Tonga.
literature
- Paul Irwin Forster (Ed.): Hoya in Australia. Queensland Succulent Society, Fortitude Valley, 1986
- Christiane Hoffmann, Ruurd van Donkelaar, Focke Albers: Hoya. In: Focke Albers, Ulli Meve (Hrsg.): Succulents Lexicon Volume 3 Asclepiadaceae (silk plants) . Pp. 147-160, Ulmer, Stuttgart 2002, ISBN 3-8001-3982-0 (p. 152).
- Robert Dale Kloppenburg, Ann Wayman: The World of Hoyas - a pictorial guide. A revised version. 248 pp., Orca Publishing Company, Central Point, Oregon, 2007 ISBN 0-9630489-4-5 (pp. 54-59, Hoya australis ssp. Rupicola and oramicola )
- Anthony Lamb, Michele Rodda (with contributions by Linus Gokusing, Steven Bosuang and Sri Rahayu): A Guide to the Hoyas of Borneo. Natural History Publications (Borneo), Kota Kinabalu, 2016 ISBN 978-983-812-170-5 , pp. 40/41.
- Surisa Somadee, Jens Kühne: Hoya 200 different wax flowers. 96 p., Formosa-Verlag, Witten 2011 ISBN 978-3-934733-08-4 (p. 29)
- Anders Wennström, Katarina Stenman: The Genus Hoya - Species and Cultivation. 144 p., Botanova, Umeå 2008 ISBN 978-91-633-0477-4 (p. 28)
Individual evidence
- ↑ Livia Wanntorp: Pollinaria of Hoya (Marsdenieae, Apocynaceae): Shedding Light on Molecular Phylogenetics. Taxon, 56) (2): 465-478, 2007 online at JSTOR
- ↑ Hoya australis at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
- ↑ a b c d e f g Rafaël Govaerts (Ed.): Hoya - World Checklist of Selected Plant Families des Royal Botanic Gardens, Kew. Last accessed on November 15, 2018.
