Scientific name:

Bupleurum rotundifolium

Vernacular name:

Thorow-wax

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Bupleurum baldense - Hare's-ear, Small
Bupleurum subovatum - Thorow-wax, False

Thorow-wax

Scientific name: Bupleurum rotundifolium L.

Diagnostic features
Erect annual to 30cm.
Leaves elliptic to suborbicular, 2-6 x 1.5-4cm, with more than 5 main veins.
Umbels with 4-8 rays.
Bracts absent.
Bracteoles ovate, longer than flowers and fruits.
Fruits 3-3.5mm, with slender prominent ridges, smooth.

Chromosome number: (2n=16).

Habitat
Introduced-casual.

Distribution
Formerly common in cornfields in most of England, especially Central & South, extinct since 1960s except as rare casual; Europe.

This species is keyed out on Page 916 in the Text Key.

Tutin, T.G. 1980. Umbellifers of the British Isles. BSBI Handbook No. 2. Botanical Society of the British Isles, London. Illustrated by Ann Davies.

Bupleurum rotundifolium 2 (Flowering habit, picture taken in cultivation by C. Gibson)
Bupleurum rotundifolium 3 (Flowering habit, picture taken in the Netherlands by J.W. Jongepier)
Bupleurum rotundifolium a (Habit and fruit details, drawing by A. Davies in Tutin, 1980; BSBI Handbook 2.)

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