Seeds of South Australia
Chondropyxis halophila (Compositae)
Salt Button-daisy
List of species for Chondropyxis
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Seed collecting:
November to January
Herbarium region:
Eyre Peninsula
NRM region:
Eyre Peninsula
IBRA region
Eyre Mallee (EYB05)Eyre Yorke Block
 Rare   (IUCN: RA d(i,ii))   [under-coll., habitat specific, salt lakes]
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 Chondropyxis]
Name derivation:
Chondropyxis from the Greek 'chondros' meaning a cartilage and 'pyxis' meaning a box; referring to the fruiting capitulum which consists of persistent cartilaginous scales holding the achenes on the receptacle. Halophila means salt loving; referring to the species habitat.
Found only from the salt lakes between Penong and Point Sinclair in South Australia, growing on gypseous soils at margins of salt lakes. Also found in Western Australia.
Native. Rare in South Australia. Uncommon in Western Australia.
Plant description:
Compact herb to 7 cm high with regularly cymose-branched, glabrous stems. Leaves subamplexicaul, linear and entire or rarely dilated near the apex with a single lateral lobe, to 35 mm long and 1.5 mm wide, subterete, succulent, glabrous, green. Flower-heads borne at successive levels, the uppermost overtopped by the leaves, the others in the dichotomous forks of branches with straw-coloured daisy-flowers. Flowering between September and October.
Fruit type:
Small straw-coloured daisy-head, receptacle and scales persistent and hardened in fruit, retaining the fertile achenes except for the outermost.
Seed type:
Yellow ovoid achenes to 2 mm long and 1 mm wide, covered in hairs.
Embryo type:
Spatulate fully developed.
Seed collecting:
Collect heads or whole plants that are brown or turning brown. Each head should have numerous tiny seeds.
Seed cleaning:
Place the heads in a tray for a week to dry. Then rub the heads gently with your hands to dislodge the seeds. Use a fine sieve to separate the seeds from the unwanted material. The seeds are tiny dark brown and ovoid in shape. 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-1593%7 d7 d
1% agar;
Incubated under winter conditions
Oct-1576%7 d14 d
1% agar;
Incubated under spring/autumn conditions
Oct-1573%7 d7 d 500 mg/L gibberellic acid 48 h;
1% agar;
Incubated under spring/autumn conditions
Oct-1570%7 d7 d 500 mg/L gibberellic acid 48 h;
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)