Seeds of South Australia
Marsdenia australis (Asclepiadaceae)
Bush Banana
List of species for Marsdenia
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Seed collecting:
December to April
Herbarium regions:
North Western, Lake Eyre, Nullarbor, Gairdner-Torrens, Flinders Ranges, Eastern, Eyre Peninsula, Murray
NRM regions:
Alinytjara Wilurara, Eyre Peninsula, South Australian Arid Lands, South Australian Murray-Darling Basin
IBRA regions
SUMMARY
Broughton (FLB02)Flinders Lofty Block
 Rare   (IUCN: RA d(ii))   [Edge of range]
Olary Spur (FLB03) 
 Rare   (IUCN: RA d(ii))
Southern Flinders (FLB04) 
 Rare   (IUCN: RA d(ii))
Northern Flinders (FLB05) 
 Least Concern
Central Flinders (FLB06) 
 Least Concern
South Olary Plain (MDD01)Murray Darling Depression
 Near Threatened
Braemer (MDD07) 
 Rare   (IUCN: RA d(ii))
Murray Scroll Belt (RIV06)Riverina
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)
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))
Kingoonya (GAW05) 
 Rare   (IUCN: RA d(ii))
Commonwealth Hill (GAW08) 
 Rare   (IUCN: RA d(ii))
Maralinga (GVD03)Great Victoria Desert
 Least Concern
Kintore (GVD04) 
 Rare   (IUCN: RA d(i,ii))
Tallaringa (GVD05) 
 Data Deficient   [no voucher]
Yellabinna (GVD06) 
 Least Concern
Barrier Range (BHC01)Broken Hill Complex
 Rare   (IUCN: RA d(ii))
Barrier Range Outwash (BHC04) 
 Rare   (IUCN: RA d(ii))
Bimbowrie (BHC05) 
 Rare   (IUCN: RA d(ii))
Curnamona (BHC06) 
 Rare   (IUCN: RA d(ii))
Strzelecki Desert (SSD05)Simpson Strzelecki Dunefields
 Rare   (IUCN: RA d(i,ii))   [outlier]
Breakaways (STP01)Stony Plains
 Least Concern
Oodnadatta (STP02) 
 Least Concern
Murnpeowie (STP03) 
 Least Concern
Witjira (STP06) 
 Near Threatened
Baltana (STP07) 
 Near Threatened
Sturt Stony Desert (CHC02)Channel Country
 Least Concern
Mann-Musgrave Block (CER01)Central Ranges
 Least Concern
Everard Block (CER03) 
 Rare   (IUCN: RA d(ii))
IBRA regions
DISPLAY ALL
5 of 6 subregionsFlinders Lofty BlockLeast Concern
, Rare
2 of 6 subregionsMurray Darling DepressionNear Threatened
, Rare
Murray Scroll Belt (RIV06)RiverinaRare
  (IUCN: RA d(i,ii))   (Probable Decline)
5 of 8 subregionsGawlerRare
4 of 4 subregionsGreat Victoria DesertLeast Concern
, Rare
, Data Deficient
4 of 4 subregionsBroken Hill ComplexRare
Strzelecki Desert (SSD05)Simpson Strzelecki DunefieldsRare
  (IUCN: RA d(i,ii))   [outlier]
5 of 7 subregionsStony PlainsLeast Concern
, Near Threatened
Sturt Stony Desert (CHC02)Channel CountryLeast Concern
2 of 3 subregionsCentral RangesLeast Concern
, Rare
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 Marsdenia]
Name derivation:
Marsdenia named after William Marsden (1754-1836), an Irish-born British traveller, plant collector and Secretary of the Admiralty. Australis from Latin meaning southern; referring to species distribution in Australia.
Distribution:
Found scattered in the northern part of South Australia. Also found in all mainland states.
Status:
Native. Common in South Australia. Rare in Victoria. Common in the other states.
Plant description:
Perennial climbing herb with twining stems containing a milky sap. Leaves linear to 100 mm long and 30 mm wide. Flowers greenish-yellow  to 75 mm long and occur in branched clusters from the leaf axils in spring to summer. The flowers are followed by a  yellow-brown seeds attached to tightly packed feathery hairs.
Fruit type:
Large green pear-shaped fruit, turning pale brown and splitting when  matured and containing numerous seeds.
Seed type:
Yellow ovoid seed to 7 mm long and 4 mm wide, with long dense pappus.
Seed collecting:
Collect fruits that are maturing, fat, hard, turning pale brown and contain fluffy seeds.
Seed cleaning:
Place the fruit in a tray and leave to dry for at least two weeks until it split. Then shake the fruits to release the seeds. No further cleaning is required. 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.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
Oct-15100%7 d7 d
1% agar;
Incubated under spring/autumn conditions
Oct-1584%7 d14 d
1% agar;
Incubated under winter 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)