Seeds of South Australia
Scambopus curvipes (Cruciferae)
Bent-stalk Cress
List of species for Scambopus
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Seed collecting:
September to November
Herbarium regions:
Gairdner-Torrens, Flinders Ranges, Eyre Peninsula
NRM regions:
Eyre Peninsula, South Australian Arid Lands
IBRA regions
St Vincent (EYB02)Eyre Yorke Block
 Regionally Extinct   [regionally extinct]
Eyre Mallee (EYB05) 
 Rare   (IUCN: RA d(i,ii))
Myall Plains (GAW01)Gawler
 Rare   (IUCN: RA d(ii))
Gawler Volcanics (GAW02) 
 Rare   (IUCN: RA d(ii))
Gawler Lakes (GAW03) 
 Rare   (IUCN: RA d(ii))
Arcoona Plateau (GAW04) 
 Rare   (IUCN: RA d(ii))
Kingoonya (GAW05) 
 Rare   (IUCN: RA d(i,ii))
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 Scambopus]
Name derivation:
Scambopus from the Greek 'scambos' meaning bent or curved and 'pous' meaning foot; referring to the curved fruiting pedicels. Curvipes from the Latin 'curvus' meaning bent; referring to the curved fruiting pedicels.
Distribution:
Endemic to South Australia and Found in the central part, growing in open mallee in swales and depression.
Status:
Native. Uncommon in South Australia.
Plant description:
Annual herbs with many-stems to 50 cm tall, hairy with rough branched and stellate hairs. Basal leaves rosette, narrow-obovate, entire or dentate or pinnatisect, stem leaves reducing. Inflorescence a terminal cluster with yellow flowers. Flowers throughout the year especially in September.
Fruit type:
Brown, fusiform pod to 20 mm long and 2 mm wide, curved, quadrangular to slightly flattened parallel to the septum, valves hairy, with a prominent midvein, pedicels usually recurred.
Seed type:
Brown reinform seed to 1.3 mm long and 1 mm wide, with a tuberculate surface.
Embryo type:
Bent.
Seed collecting:
Collect maturing pods those turning pale brown with brown seeds inside. Be gentle with the pods as they split open easily.
Seed cleaning:
Place the pods in a tray and cover with paper to prevent seeds from popping out and leave to dry for a week. Then rub the dried pods gently by hand to dislodge the seeds. Use a sieve to separate the 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%.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
1600 (0.6 g)
1600 (0.6 g)
50+17-Sep-2008PJA176
Eyre Peninsula
20-Jul-2009100%-18°C
TST7891-Jan-2012-18°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
Jun-1732%14NA 500 mg/L gibberellic acid for 24 h;
1% agar;
Incubated under winter conditions
Jun-176%14NA 500 mg/L gibberellic acid for 24 h;
1% agar;
Incubated under spring/autumn conditions
Jun-172%28NA seeds leached in water for 24 h;
1% agar;
Incubated under winter conditions
Jun-170%NANA seeds leached in water for 24 h;
1% agar;
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)