Seeds of South Australia
Frankenia subteres (Frankeniaceae)
Round Sea-heath
List of species for Frankenia
Display more images
Click on an image to enlarge it
Seed collecting:
November to January
Herbarium regions:
Lake Eyre, Flinders Ranges
NRM region:
South Australian Arid Lands
IBRA regions
Northern Flinders (FLB05)Flinders Lofty Block
 Near Threatened
Oodnadatta (STP02)Stony Plains
 Data Deficient   [unlikely]
Murnpeowie (STP03) 
 Rare   (IUCN: RA d(ii))
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 Frankenia]
Name derivation:
Frankenia named after Johan Frankenius (1590-1661), a Swedish botanist. Subteres from the Greek 'sub' a prefix meaning partially, almost or somewhat and the Latin 'teres' meaning round or cylindrical; alluding to plant roundish form.
Endemic to South Australia and found in the north-eastern corner, growing in rocky drainage line.
Native. Uncommon in South Australia.
Plant description:
Small shrub with branches differentiated into long- and short-shoots, hairy, internodes to 18 mm long. Long-shoot leaves to 12.5 mm long, leaf blades narrowly oblong to linear, terete, to 1.5 mm wide, margins strongly thickened, tightly revolute on fresh, dried and boiled material, true abaxial surface reduced to a narrow medial furrow, mid-vein narrow, linear, inconspicuous, surfaces grey-green, adaxial and abaxial surfaces hairy, short-shoot leaves often somewhat shorter than the subtending long-shoot leaves. Flowers borne at the top 1-3 nodes of the upper branches, commonly in clusters with 2-11 pink to white flowers or solitary. Flowering between September and October.
Fruit type:
Brown cylindrical capsule with 1-4 seeds.
Seed type:
Light brown ovoid seed to 1.5 mm long and 0.6 mm wide, with fine tubercules.
Embryo type:
Spatulate fully developed.
Seed collecting:
Look at the tip of branches for dried flower heads. Collect the heads that are cylindrical, brown, slightly fat at the base. This should contain small ovoid seed.
Seed cleaning:
Place the flower heads in a tray and leave to dry for at least a week. Then rub the dried heads gently to dislodge the seeds. Use a fine sieve to separate the seeds from the unwanted material. Be careful as the seeds are very small. 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:
Seed set can be low but viability is high. From one collection, the seed viability was high, at 90%.
Seed germination:
Seeds are non-dormant, viable seed should germinate readily.
Seeds stored:
LocationNo. of seeds
(weight grams)
of plants
Collection number
Collection location
% ViabilityStorage
16000 (2.72 g)
16000 (2.72 g)
Flinders Ranges
1-Jan-201290%+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.