Seeds of South Australia
Caladenia richardsiorum (Orchidaceae)
Little Dip Spider-orchid
List of species for Caladenia
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Seed collecting:
January to February
Herbarium region:
South Eastern
NRM region:
South East
IBRA regions
Bridgewater (NCP01)Naracoorte Coastal Plain
 Vulnerable   (IUCN: VU D2)   [hybridising]
Murray Lakes and Coorong (MDD03)Murray Darling Depression
 Endangered   (IUCN: EN B2ab(i,ii,iii))   (Probable Decline)   [some taxonomic issues; hybridising; JNiejalke has more records for Coorong; highly localised]
RSCA map:
Regional Species Conservation Assessments per IBRA subregion. Please click the thumbnail map.
AVH map:
Australian distribution map (external link)
SA Census:
Census of South Australian plants (external link)     [genus Caladenia]
Name derivation:
Caladenia from the Greek 'callos' meaning beauty and 'aden' meaning a gland; referring to the colourful labellum and the glistening glands at the base of the column that adorn many of the species. Richardsiorum named in honour of Helen and Barry Richards of Victoria for their dedication and unerring quest for improved knowledge on the propagation and cultivation of Australian terrestrial orchids.
Endemic to South Australia. Found in the lower South-east in coastal vegetation.
Native. Very rare in South Australia.
Plant description:
Grows between 20-40 cm and usually has only a single flower. It has a single lanceolate leaf 16-22 cm long. Flower is yellow green up to 40 mm wide. Sepals have prominent but short black clubs 8-10 mm long. The labellum is is greenish-cream has maroon calli and toothed margins. Flowering between September and November.
Fruit type:
Brown papery ellipsoid capsule.
Seed type:
Very small brown ellipsoid seed with a long translucent brown mesh-like covering.
Seed collecting:
Collect fat capsules as they start to dry and turn brown. Pods will split and release the seeds quickly and will require monitoring. To increase the chances of collecting mature pods, it is recommended that a small breathable bag (ie. Organza bags) be used to enclose the developing capsules.
Seed cleaning:
Place the capsules in a container that will hold fine seeds and leave to dry for a few weeks or until the capsule split. Then carefully hold the capsule and tap it gently to release the seeds. Store the seeds with a desiccant such as dried silica beads or dry rice, in an air tight container in a cool and dry place, a refrigerator, or in liquid nitrogen.
Seed viability:
For the NVC South East Orchid Project a total of six populations consisting of more than X individuals in total were recorded from Rivoli Bay, Nora Creina, Cullen Reserve, Lankys Well, Teeluk and Little Dip Conservation Park. Approximately 2,500,000 seeds (1.5g) were banked for these six observed populations. Seed viability ranged from 68% to 90%.