Plants of
South Australia
Caladenia rigida
Orchidaceae
Adelaide Hills White Spider-orchid
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Botanical art

Kath Alcock painting: 1.

Etymology

Caladenia from the Greek 'kallos' meaning beauty and 'aden' meaning a gland, referring to the colourful labellum and the glistening glands at the base of the column that are present in many of the species. Rigida from Latin meaning stiff, rigid or inflexible, referring to the perianth segments which spread rigidly rather than drooping.

Distribution and status

Endemic to the southern Mount Lofty Ranges in South Australia and found between Macclesfield in the south and Williamstown in the north, growing on ridge tops and hillslopes in grey-brown loam often associated with coarse quartzite gravel or sandstone pebbles in open woodland dominated by Eucalyptus obliqua, E. goniocalyx, E. leucoxylon, E. fasciculosa and E. microcarpa. Native. Endangered in South Australia. Endangered in Australia (EPBC Act).
Herbarium region: Southern Lofty
NRM region: Adelaide and Mount Lofty Ranges
AVH map: SA distribution map (external link)

Plant description

Slender terrestrial orchid with a hairy flowering stem to 30 cm in flower. Leaves narrow-lanceolate, to 20 cm long, single, hairy. Flowers 1-2, to 5 cm wide, white with red marks on the calli and labellum fringe, not fragrant. Dorsal sepal erect and incurved over the column and terminates in a dark red, glandular club. Lateral sepals are rigidly spreading, and have similar clubs to the dorsal sepal. Labellum ovate, to 1 cm long, white with red-brown subulate marginal teeth and four rows of calli that are mostly basally club-shaped and red with white tips. Flowering between August and October. Fruits are pale-brown hairy, papery ellipsoid capsule.

Seed collection and propagation

Collect seeds between late October and November. 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. 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.

Seeds stored:
  Hide
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
3-Nov-2009J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
3-Nov-2009J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
21-Nov-2005R. Faast
Southern Lofty
1-Nov-2016N/C-80°C
27-Oct-2009J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
2 pods5-Nov-2008J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
17-Nov-2007J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
13 pods4-Nov-2008J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
3 pods4-Nov-2008J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
21-Nov-2005R. Faast
Southern Lofty
1-Nov-2016N/C-80°C
17-Nov-2005R. Faast
Southern Lofty
1-Nov-2016N/C-80°C
2 podsJ. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
9-Nov-2005J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
7-Nov-2005J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
1 podJ. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
9-Nov-2005J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
9-Nov-2005J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
9-Nov-2005J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
9-Nov-2005J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
17-Nov-2007J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
17-Nov-2007J. Quarmby
Southern Lofty
1-Nov-201650%-80°C
2-Nov-2007J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
2 pods7-Nov-2007J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
7-Nov-2007J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
2-Nov-2007J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
2-Nov-2007J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
2-Nov-2007J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
2-Nov-2007J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
2-Nov-2007J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
7-Nov-2007J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
7-Nov-2007J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
8-Nov-2007J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
8-Nov-2007J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
9-Nov-2007J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
8-Nov-2007J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
8 pods8-Nov-2007J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
7-Nov-2007J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
7-Nov-2007J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
7-Nov-2007J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
6 pods29-Jun-2005J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
1-07-20J. Quarmby
Southern Lofty
1-Nov-2016N/C-80°C
BGA64,400 (0.023 g)328-Sep-2017K. Brewer
Southern Lofty
30-Jun-2018N/C-18°C
BGA61,600 (0.022 g)423-Oct-2019TST1427
Southern Lofty
24-Jun-2020N/C-18°C
BGA190,000 (0.068 g)1223-Oct-2019Woodcutter, Coromandel East
Southern Lofty
24-Jun-2020N/C-18°C
BGA54,900 (0.019 g)37-Nov-2018K.H.Brewer
Southern Lofty
24-Jun-2020 -18°C
BGA200,000 (0.72 g)923-Oct-2019TST1426
Southern Lofty
24-Jun-2020N/C-18°C
Location: BGA — the seeds are stored at the Adelaide Botanic Gardens, MSB — the seeds are stored at the Millennium Seed Bank, Kew, England.
Number of plants: This is the number of plants from which the seeds were collected.
Collection location: The Herbarium of South Australia's region name.
% Viability: Percentage of filled healthy seeds determined by a cut test or x-ray.