Seeds of South Australia
Blackstonia perfoliata (Gentianaceae)
Yellow Wort
List of species for Blackstonia
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Seed collecting:
January to March
Herbarium regions:
Eyre Peninsula, South Eastern
NRM regions:
Eyre Peninsula, South East
AVH map:
Australian distribution map (external link)
SA Census:
Census of South Australian plants (external link)     [genus Blackstonia]
Name derivation:
Blackstonia named after John Blackstone (1712-1753) and English apothecary and botanist. Perfoliata from the Latin 'per' a prefix meaning through and 'folium' meaning a leaf; referring to the base of the leaf which is fused around the stem so that the leaf appears to pass through it. 
Distribution:
An introduced species native to Europe and the Mediterranean region and recorded on the southern Eyre Peninsula and the South-east in South Australia, growing on shallow soils derived from limestone. Also recorded in Victoria.
Status:
Introduced. Uncommon in South Australia and Victoria.
Plant description:
Erect annual to 25 cm high with a distinct basal rosette. Basal leaves densely clustered, oblanceolate to elliptic, to 12 mm long and 4 mm wide, rounded or obtuse, withering early. Upper leaves ovate to almost triangular, to 25 mm long and 14 mm wide, perfoliate. Inflorescence 1-3 terminal spike with bright yellow flowers. Flowering between November and February.
Fruit type:
Brown ellipsoid capsule to 8 mm long, remaining enclosed in enlarged corolla-tube.
Embryo type:
Spatulate under-developed.
Seed collecting:
Collect mature capsules as they dry off and turn brown. They should contain hard seeds inside.
Seed cleaning:
Place the capsules in a tray for a week. Then rub the capsules with your fingers to dislodge all 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.