Seeds of South Australia
Caladenia tensa (Orchidaceae)
Rigid Spider-orchid
List of species for Caladenia
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Seed collecting:
January to February
Herbarium regions:
Flinders Ranges, Eyre Peninsula, Northern Lofty, Murray, Yorke Peninsula, Southern Lofty, Kangaroo Island, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Eyre Peninsula, Kangaroo Island, Northern and Yorke, South Australian Arid Lands, South Australian Murray-Darling Basin, South East
IBRA regions
Lucindale (NCP03)Naracoorte Coastal Plain
 Rare   (IUCN: RA d(i,ii))   [edge of range, in Jip Jip CP]
Tintinara (NCP04) 
 Least Concern
Kangaroo Island (KAN01)Kanmantoo
 Rare   (IUCN: RA d(i,ii))   [only found in a few locations; possible taxonomic issues]
Fleurieu (KAN02) 
 Rare   (IUCN: RA d(i,ii))   [edge of range, taxonomic issues; mallee sp]
Murray Mallee (MDD02)Murray Darling Depression
 Least Concern   (Probable Decline)   [taxonomic issues]
Murray Lakes and Coorong (MDD03) 
 Rare   (IUCN: RA d(ii))   (Probable Decline)
Lowan Mallee (MDD04) 
 Near Threatened   (Probable Decline)   [some crossing occurring]
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. Tensa meaning rigid or straight, refers to the straight sepals of this species
Distribution:
This species is found through much of South Australia, in the Murray, Mount Lofty, South-East and Kangaroo Island. Grows in dry woodland, mallee and on rock outcrops in a variety of soil types. Also found in Victoria.
Status:
Native. Uncommon in South Australia. Rare in Victoria.
Plant description:
Grows to 40 cm tall with one or two flowers. A single basal leaf. Flowers are green with variable crimson striping, the large labellum is white with green lateral lobes, a maroon tip and small, sparse maroon calli. Most readily identified by the stiffly held sepals which are 45 mm long with short yellow clubs. 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 or in liquid nitrogen.
Seed viability:
For the NVC South East Orchid Project one population consisting of more than X individuals in total was recorded for the Bangham Conservation Park. Approximately 38,000 seeds (0.02g) were banked for this population. Seed viability for this collection was 61%.