Williamson's Riceflower
Display all 9 images
Regional Species Conservation Assessments per IBRA subregion.
Least concern
Near threatened
Rare
Vulnerable
Endangered
Critically endangered
Extinct
Data deficient
Adelaide
Arkaroola
Ceduna
Coober Pedy
Hawker
Innamincka
Marla
Marree
Mount Gambier
Oodnadatta
Renmark
Wudinna
Keith
Yunta
Display IBRA region text
| Eyre Hills (EYB03) | Eyre Yorke Block | Vulnerable (IUCN: VU D1+2) |
| Talia (EYB04) | | Vulnerable (IUCN: VU B2ab(i,ii,iii)) (Probable Decline) |
| Eyre Mallee (EYB05) | | Rare (IUCN: RA d(ii)) |
| Murray Mallee (MDD02) | Murray Darling Depression | Vulnerable (IUCN: VU D2) [needs fire or disturbance] |
| Lowan Mallee (MDD04) | | Rare (IUCN: RA d(i,ii)) [highly localised] |
Botanical art
Kath Alcock painting: 1
Etymology
Greek 'pimele' fat, alluding to the fleshy cotyledons and
Distribution and status
Sandy soils and disturbed sites, often observed post-fire Rare
Herbarium regions: Eyre Peninsula, Murray
NRM regions: Eyre Peninsula, South Australian Murray-Darling Basin
AVH map: SA distribution map (external link)
Plant description
Wooly subshrub to 30cm tall. Leaves elliptic, 2.5-16 mm long, 1-5 mm wide, acute to obtuse, lower surface with coarse antrorse white or colourless hairs and the upper surface with fewer and finer hairs. Inflorescence a terminal spike to 6.5cm long. Flowers bisexual, white, 3.5-5 mm long. Flowering most of the year. Seeds are seed ventricose, hooked at the apex, glabrous, black, finely reticulate 1-5mm
Seed collection and propagation
Collect seeds between November and December.
| Location | No. of seeds
(weight grams) | Number
of plants | Date
collected | Collection number
Collection location | Date
stored | % Viability | Storage
temperature | BGA
MSB | 2,100 (1.18 g)
2,100 (1.18 g) | 50+ | 16-Nov-2010 | DEM7055
South Eastern | 1-Jan-2012 | 95% | -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:
Display
| Date | Result | T0 | T50 | Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod |
| Jun-08 | 23% | 20 | NA |
after ripening 45°C oven 6weeks;
1% agar;
Incubated under winter conditions |
| Jun-08 | 13% | 27 | NA |
1% agar;
Incubated under winter conditions |
| Jul-11 | 8% | 28 | NA |
1% agar with 250 mg/L gibberellic acid (pH 6.5);
Incubated under winter conditions |
| Jul-11 | 2% | 56 | NA |
1% agar with 100 mg/L potassium nitrate;
Incubated under winter conditions |
| Jul-11 | 2% | 28 | NA |
1% agar with 250 mg/L gibberellic acid (pH 6.5);
Incubated under spring/autumn conditions |
| Jul-11 | 0% | NA | NA |
1% agar with 100 mg/L potassium nitrate;
Incubated under spring/autumn conditions |
| Jul-11 | 0% | NA | NA |
1% agar;
Incubated under spring/autumn conditions |
| Jul-11 | 0% | NA | NA |
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)
