Seeds of South Australia
Isotoma scapigera (Campanulaceae)
Erect Isotome
List of species for Isotoma
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Seed collecting:
November to December
Herbarium regions:
Gairdner-Torrens, Eyre Peninsula, Yorke Peninsula
NRM regions:
Eyre Peninsula, Northern and Yorke, South Australian Arid Lands
IBRA regions
Southern Yorke (EYB01)Eyre Yorke Block
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)   [salty areas, restricted habitat, threatened by mining, disturbance, weeds]
Eyre Hills (EYB03) 
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)   [habitat specialist]
Talia (EYB04) 
 Rare   (IUCN: RA d(ii))   (Probable Decline)   [habitat specialist]
Eyre Mallee (EYB05) 
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)   [habitat specialist]
Yalata (NUL03)Nullarbor
 Rare   (IUCN: RA d(i,ii))   [no records]
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 Isotoma]
Name derivation:
Isotoma from the Greek 'isos' meaning equal and 'tomos' meaning, a cutting; referring to the equally cut corolla lobes. Scapigera from the Latin 'scapus' meaning stalk, stem and 'gero' meaning to bear; referring to the leafless or almost so flower stalk growing from the ground.
Found along the coast from the Nullarbor to the tip of York Peninsula in South Australia, growing on moist mudflats often around salt marshes, winter-wet swampy flats and sand dunes. Also found in Western Australia.
Native. Uncommon in South Australia. Common in Western Australia.
Plant description:
Annual herbs with branches up to 3 cm long, somewhat branched with leaves in an apparent basal rosette, hairy to smooth. Leaves subpetiolate with a long cuneate base, oblanceolate- to obovate-spathulate, becoming sessile, elliptic-oblong towards the apex of branches, to 30 mm long and 12 mm, obtuse to acute, fine to coarsely serrate. Flowers borne in the axils of leaf-like bracts at the base of the plant, the stiffly erect pedicels to 12 cm long, with buds nodding, with flowers level and fruits stiffly erect. Sepals scarcely connate, the lobes linear-triangular, to 4.5 mm long, acute to pointed, corolla pale to usually deeply purplish-blue with a white to yellow patch on the lower 3 lobes and into the throat, the tube to 5 mm long, the lobes oblong-oblanceolate to rarely oblong-obovate, to 7 mm long, acute, glabrous. Flowering between October to December.
Fruit type:
Papery brown elliptical capsule.
Seed type:
Dark brown elliptical seed to 0.4 mm long and 0.3 mm wide, smooth surface.
Embryo type:
Spatulate under-developed.
Seed collecting:
Collect mature capsules, those that are turning a pale straw colour and contain brown seeds.
Seed cleaning:
Place the capsules in a tray and leave to dry for one weeks. Then rub the capsules gently by hand to dislodge the seeds. Use a sieve to separate 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:
From two collections, the seed viability were high, at 100%.
Seeds stored:
LocationNo. of seeds
(weight grams)
of plants
Collection number
Collection location
% ViabilityStorage
185000+185000 (0.3+0.3 g)
375000 (0.53 g)
Yorke Peninsula
28-Mar-2006100%+5°C, -18°C
BGA178000 (1.78 g)100+11-Nov-2009TST884
Yorke Peninsula
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.