Seeds of South Australia
Cheiranthera volubilis (Pittosporaceae)
Twining finger-flowers
List of species for Cheiranthera
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Seed collecting:
January to March
Herbarium region:
Kangaroo Island
NRM region:
Kangaroo Island
IBRA region
Kangaroo Island (KAN01)Kanmantoo
 Vulnerable   (IUCN: VU D2)   [endemic to KI; mostly on roadsides]
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 Cheiranthera]
Name derivation:
Cheiranthera from the Greek 'cheir' meaning hand and 'anthera' meaning anther; referring to the five anthers resembling fingers. Volubilis from Latin meaning to turn, revolve or twine; alluding to the species habit.
Distribution:
Endemic to South Australia and found only on Kangaroo Island.
Status:
Native. Very rare in South Australia.
Plant description:
A weak twining perennial shrub with long linear leaves and large blue flowers at the top of the stems. The yellow anthers are arranged like fingers on the hand. Flowering between October and March.
Fruit type:
Brown ovoid capsules with numerous seeds inside.
Seed type:
Small, shiny, red-brown reniform seeds to 3 mm long and 2 mm wide, with a slight wrinkled surface.
Seed collecting:
Collect capsules as they start to dry and turn brown. Capsules may be collected green if the seeds are hard and brown-red. To increase the chances of collecting sufficient viable seeds, it is recommended that a small bag (ie. Organza bags) be used to enclose the developing capsules.
Seed cleaning:
Place the capsules in a tray and cover with paper to prevent the seeds popping out. Leave to dry for one week. Then carefully rub the dried capsules by hand to prevent damaging the seeds as the seedcoat is thin. Use a sieve to remove unwanted material. 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.
Seed viability:
From one collection, the seed viability was high, at 100%.
Seed germination:
This species is generally difficult to germinate, it has morphophysiological dormancy and complex germination requirements.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA1506337-Jan-2004PJA80
Kangaroo Island
1-Sep-2004100%+5°C, -18°C
BGA4419-Jan-2006Alice
Kangaroo Island
1-Aug-2007-18°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.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
March 200742%61dNA Stored at 5°C for 1 year followed by leaching in filtered water (48rhs) and then surface sterilisation in 20% H2O2 solution (5mins).
Wet filter paper placed over wettex sponge.
Incubated under spring/autumn conditions
August 200626%70dNA Stored at -18°C for 1 year followed by leaching in filtered water (48rhs) and then surface sterilisation in 20% H2O2 solution (5mins).
Wet filter paper placed over wettex sponge.
Incubated under spring/autumn conditions
May 20070%NANA Exposed to aerosol smoke (15mins) in a smoke tent.
Wet filter paper placed over wettex sponge.
Incubated under spring/autumn conditions
May 20070%NANA Leached in filtered water (100hrs). Seed allowed to dry and then exposed to aerosol smoke in a smoke tent (15mins).
Wet filter paper placed over wettex sponge.
Incubated under spring/autumn conditions
May 20070%NANA None.
Wet filter paper placed over wettex sponge.
Incubated under spring/autumn conditions
May 20070%NANA Leached in filtered water (100hrs).
Wet filter paper placed over wettex sponge.
Incubated under spring/autumn conditions
Result: Maximum percentage of germination observed.
T0: Number of days before first germinant observed.
T50: Number of days to achieve 50% germination.
Pre-treatment: The initial treatment that the seeds received prior to placement on germination media.
Germination medium: The substrate that seeds were placed on for the duration of the germination experiment.
Incubator conditions:
Photoperiod: The duration of light exposure that the seeds were subject to during a 24 hour period.
Thermoperiod: The constant or diurnal temperatures that seeds were subject to during a 24 hour period.
Winter conditions: 15°C 20 h (3am→11pm); 5°C 4 h (11pm→3am) / 10 h light (8am→6pm); 14 h dark (6pm→8am)
Spring/Autumn conditions: 22°C 12 h (8am→8pm); 10°C 12 h (8pm→8am) / 12 h light (8am→8pm); 12 h dark (8pm→8am)
Summer conditions: 30°C 14 h (6am→8pm); 15°C 10 h (8pm→6am) / 14 h light (6am→8pm); 10 h dark (8pm→6am)