Seeds of South Australia
Pultenaea pedunculata (Leguminosae)
Matted Bush-pea
List of species for Pultenaea
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Seed collecting:
October to January
Herbarium regions:
Eyre Peninsula, Northern Lofty, Murray, Southern Lofty, Kangaroo Island, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Eyre Peninsula, Kangaroo Island, South Australian Murray-Darling Basin, South East
IBRA regions
Lucindale (NCP03)Naracoorte Coastal Plain
 Endangered   (IUCN: EN B2ab(i,ii,iii))   (Probable Decline)   [could be extinct]
Tintinara (NCP04) 
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)
Kangaroo Island (KAN01)Kanmantoo
 Vulnerable   (IUCN: VU D2)   [very localised; in Beyeria CP; prob stable; occurs in & around heavily cleared areas]
Fleurieu (KAN02) 
 Near Threatened
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Least Concern
Broughton (FLB02) 
 Vulnerable   (IUCN: VU D1+2)
Eyre Hills (EYB03)Eyre Yorke Block
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)   [needs high rainfall]
Lowan Mallee (MDD04)Murray Darling Depression
 Rare   (IUCN: RA d(i,ii))
Wimmera (MDD05) 
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)   [edge of range, on roadsides; could be threatened by Hwy upgrade]
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 Pultenaea]
Name derivation:
Pultenaea named after Richard Pulteney (1730-1801), an English physician, botanist and biographer of Carl Linnaeus. Pedunculata from the Latin 'pedunculus' meaning a little foot; referring to the long  flower stalk (peduncle).
Distribution:
Found in the southern part of South Australia, on the southern Eyre Peninsula, Kangaroo Island, Mount Lofty Ranges and the upper South-east, growing in dry sclerophyll woodland on a variety of soils. Also found in New South Wales, Victoria and Tasmania.
Status:
Native. Uncommon in South Australia. Rare in New South Wales. Common in the other states.
Plant description:
Prostrate, mat-forming shrub to 20 cm high with stems up to several meters long, covered with whitish hairs. Leaves alternate, narrow-elliptic, to 11 mm long and 2 mm wide, sparsely hairy with a recurved point at the tip. Flowers solitary orange-yellow with reddish markings pea-flower on a long stalk to 20 mm long. Flowering between August and December.
Fruit type:
Hairy brown ovoid pod to 5 mm long, containing two seeds. 
Seed type:
Shiny, black, semi-flat reniform seed to 2.5 mm long and 1.8 mm wide, with a creamy aril.
Embryo type:
Bent.
Seed collecting:
Collect maturing pods, those that are brown or turning brown and contain hard black seeds inside.
Seed cleaning:
Place the pods in a paper bag and leave to dry for one to two weeks. Then rub the pods with a rubber bung 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 average, at 80%.
Seed germination:
This species has physical dormancy that needs to be overcome for the seed to germinate. The seed coat needs to be ruptured so that water can enter the seed before germination can occur. Methods to rupture the seed coat include scarification with sand paper or nicking the seed coat with a sharp blade or hot water treatment by immersion in boiling water.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
Jul-16100%7 d14 d seed coat nicked with scalpel, leached in water 24 h;
1% agar;
Incubated under spring/autumn conditions
Jun-0493%11 d17 d 20% hydrogen peroxide 10 min, water rinse, seed coat nicked with scalpel;
1% agar;
8/16;  /  20°C
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)