Yellow-wort
Yellow-wort, Cogdon Nature Reserve, Dorset
Yellow-wort - bilobed stigmas and linear stamens
Flower buds, linear lobed calyx
Greyish leaves and stem
Stem through greyish, joined leaves
Blackstonia perfoliata
Gentianaceae
June to October
It is found throughout the country except for parts of the North,
the Midlands, Norfolk and the far Southwest.
See the BSBI distribution map Yellow-wort
Yellow-wort grows on open, dry, shallow, stony limestone soils,
calcareous turf, stabilised sand dunes and by paths, roads,
railways and quarries.
It is a native, annual or biennial, greyish, upright herb, growing
up to 50cm.
Flowers are 1 to 1.5cm with 6 to 9 yellow petals.
There are 6 to 8 linear stamens, a large, yellow, bilobed stigma
and a yellow, oval ovary.
The calyx has linear lobes and appears claw-like.
Flowers close when the sun is behind cloud.
Leaves are greyish, 1 to 2 cm long and joined so that paired
leaves look single with the stem growing out through the middle.
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Yellow-wort, Cogdon Nature Reserve, Dorset
Yellow-wort - bilobed stigmas and linear stamens
Flower buds, linear lobed calyx
Greyish leaves and stem
Stem through greyish, joined leaves
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