Seeds of South Australia
Pultenaea trinervis (Leguminosae)
Three-nerve Bush-pea
List of species for Pultenaea
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Seed collecting:
December to February
Herbarium regions:
Eyre Peninsula, Southern Lofty, Kangaroo Island
NRM regions:
Adelaide and Mount Lofty Ranges, Eyre Peninsula, Kangaroo Island
IBRA regions
Kangaroo Island (KAN01)Kanmantoo
 Rare   (IUCN: RA d(ii))   [on roadsides ]
Fleurieu (KAN02) 
 Least Concern   [needs sandy areas and good rainfall]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Rare   (IUCN: RA d(ii))   [localised; needs sandy areas and good rainfall]
Eyre Hills (EYB03)Eyre Yorke Block
 Least Concern
Talia (EYB04) 
 Rare   (IUCN: RA d(i,ii))
Murray Mallee (MDD02)Murray Darling Depression
 Vulnerable   (IUCN: VU B2ab(i,ii,iii); D2)   (Probable Decline)   [edge of range; could be extinct]
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. Trinervis from the Latin 'tri' meaning three and 'nervis' meaning nerve; referring to the three prominent veins on the leaves.
Distribution:
Endemic to South Australia and found on the Eyre Peninsula, Kangaroo Island and the southern Mount Lofty Ranges, growing in heath and mallee, often dominated by Allocasuarina muelleriana, Eucalyptus baxteri, E. diversifolia, E. cladocalyx or E. leucoxylon on sand to gravelly clay over sandstone, sometimes over limestone.
Status:
Native. Uncommon in South Australia.
Plant description:
Erect to prostrate shrub to 0.5 m high, branchlets sparsely to densely hairy. Leaves alternate, to 13.5 mm long and 2–4 mm wide, elliptic, rigid, acute, fine point but not pungent, concave and glabrous above, hairy beneath and on the margins, 3-nerved. Inflorescence 1 or 2 terminally on short branchlets or axillary with yellow to orange with red striations at front pea-flowers. Flowering between September and January.
Fruit type:
Hairy brown ovoid pod to 3.5 mm long.
Seed type:
Wrinkled black reniform seed to 2.5 mm long and 1.5 mm wide, with a cream aril.
Embryo type:
Bent.
Seed collecting:
Collect maturing pods, those that are brown or turning brown and contain hard dark 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 high, at 95%.
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%14 d14 d seed coat nicked with scalpel, leached in water 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)