Seeds of South Australia
Isopogon ceratophyllus (Proteaceae)
Horny Cone-bush
List of species for Isopogon
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Seed collecting:
January to December
Herbarium regions:
Northern Lofty, Murray, Southern Lofty, Kangaroo Island, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Kangaroo Island, South East
IBRA regions
Mount Gambier (SVP02)Southern Volcanic Plain
 Least Concern
Bridgewater (NCP01)Naracoorte Coastal Plain
 Least Concern
Glenelg Plain (NCP02) 
 Least Concern
Lucindale (NCP03) 
 Least Concern
Tintinara (NCP04) 
 Least Concern
Kangaroo Island (KAN01)Kanmantoo
 Least Concern
Fleurieu (KAN02) 
 Least Concern   [fire responsive; PC affteced]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Least Concern   [fire responsive sp; PC affected, large areas of dieback seen in Aldinga Scrub]
Murray Mallee (MDD02)Murray Darling Depression
 Rare   (IUCN: RA d(i,ii))   [edge of range]
Murray Lakes and Coorong (MDD03) 
 Least Concern
Lowan Mallee (MDD04) 
 Least Concern
Wimmera (MDD05) 
 Rare   (IUCN: RA d(ii))   [edge of range]
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 Isopogon]
Name derivation:
Isopogon from the Greek 'isos' meaning equal and 'pogon' meaning beard; alluding to the tufts of hairs at the apex of the perianth segments. Ceratocarpa from the Greek 'keras' meaning horn and 'phyllum' meaning a leaf; referring to the stiff antler-like leaves.
Distribution:
Found on Kangaroo Island, southern Mount Lofty Ranges and the South-east in South Australia, growing on sand, rarely sandy clay, in sclerophyllous shrubland, woodland and forest. Also found in Victoria and Tasmania.
Status:
Native. Common in South Australia. Common in Victoria. Rare in Tasmania.
Plant description:
Small prickly shrub to 65 cm with a thick woody rootstock that forms dense, spiky tufts leaves. Leaves are crowded, rigid, to 8 cm long with stalks that are flattened and at least as long as the blade. The blades are arranged or divided into 2 or 3 narrow lobes ending in a pungent point. Inflorescence mostly terminal consisting of dense globular cones of yellow flowers. Flowering between July and January.
Fruit type:
Greyish brown cone to 2 cm diameter.
Seed type:
Dark brown nut to 4 mm long and 1.5 mm wide, covered in dense long creamy hairs.
Embryo type:
Investing.
Seed collecting:
Collect cones that are matured, turning brown, to ensure mature seed. Be care fully when collecting the cones as the plant is very prickly. Wear gloves is recommended.
Seed cleaning:
Place the cones in a tray and leave to dry for 2 weeks. Then rub the dried heads with a rubber bung to dislodge the fruits. Use a sieve to separate any unwanted material. Seeds are enclosed in the hard fruit and can be stored as is. Store the fruit 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 average, at 65%.
Seed germination:
Seeds are non-dormant, viable seed should germinate readily.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
4500 (29.5 g)
4500 (29.5 g)
20+11-Apr-2006KHB61
Southern Lofty
1-Aug-200765%-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.