Seeds of South Australia
Caladenia tensa (Orchidaceae)
Rigid Spider-orchid
List of species for Caladenia
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Seed collecting:
December to February
Herbarium regions:
Murray, South Eastern
NRM regions:
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 means rigid or straight; referring to its straight, rigid lateral sepals.
Distribution:
Found in the upper South-East in South Australia, growing in dry woodland and mallee on sandy loams. Also found in Victoria with four old record from the central west of New South Wales.
Status:
Native. Uncommon in South Australia. Rare in Victoria. Endangered in Australia (EPBC Act).
Plant description:
Terrestrial orchid to 40 cm tall in flower with a single hairy leaf. Inflorescence on a slender hairy stem with one or two green flower 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, refrigerator 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%.