Seeds of South Australia
Polypogon tenellus (Gramineae)
Native beard-grass
List of species for Polypogon
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Seed collecting:
October to November
Herbarium region:
Yorke Peninsula
NRM region:
Northern and Yorke
IBRA region
Southern Yorke (EYB01)Eyre Yorke Block
 Vulnerable   (IUCN: VU D2)
Talia (EYB04) 
 Vulnerable   (IUCN: VU D2)   [possibly introduced, from WA]
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 Polypogon]
Name derivation:
Polypogon from the Greek 'polys' meaning many and 'pogon' meaning beard; referring to the hairy panicle. Tenellus meaning small, delicate, tender; alluding to its habit.
Distribution:
Currently only known from the lower part of Yorke Peninsula in South Australia. Also found in Western Australia.
Status:
Native. Very rare in South Australia. Common in Western Australia.
Plant description:
Small erect annual grass to 15 cm tall. Looks similar to the introduced coast beard-grass (Polypogon maritimus), differ by the number of awns on the lemma. Plant green turning red as it matures.
Fruit type:
Reddish heads to about 3 cm at the terminal.
Seed type:
Pale brown seeds with 3 awns, central awn longer than the two side awns.
Embryo type:
Lateral.
Seed collecting:
Collect heads that are reddish in colour. Run your fingers gently thorugh the heads and collect only those that come off easily. These will contain the mature seeds.
Seed cleaning:
No cleaning is required if you collected the seeds by running your fingers through the heads. 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.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
13500 (2.59 g)
13500 (2.59 g)
10011-Nov-2009TST806
Yorke Peninsula
Jun-201085%+5°C, -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
May-1094%14 d20 d
1% agar with 250 mg/L gibberellic acid (pH 6.5);
Incubated under winter conditions
May-1092%20 d48 d
1% agar with 100 mg/L potassium nitrate;
Incubated under spring/autumn conditions
May-1088%27 d41 d
1% agar with 250 mg/L gibberellic acid (pH 6.5);
Incubated under spring/autumn conditions
May-1088%14 d27 d
1% agar with 100 mg/L potassium nitrate;
Incubated under winter conditions
May-1080%14 d27 d
1% agar;
Incubated under winter conditions
May-1066%27 d48 d
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)