This perennial herb was first described in 1924, and has therefore been recognised longer than many members of the L. binervosum aggregate. It is restricted to a single site where it occurs on steep S.-facing Carboniferous limestone cliff-slopes and in rock crevices. Lowland.
There has been no change in the distribution of this taxon since the map in Perring & Sell (1968), although records of L. transwallianum in Ireland are now regarded as a separate taxon, L. recurvum subsp. pseudotranswallianum, while the record from N. Devon is now considered to be a narrow-leaved variant of L. procerum subsp. procerum (var. medium).
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Light (Ellenberg): 9
Moisture (Ellenberg): 3
Reaction (Ellenberg): 8
Nitrogen (Ellenberg): 3
Salt Tolerance (Ellenberg): 4
January Mean Temperature (Celsius): 5.6
July Mean Temperature (Celsius): 15.9
Annual Precipitation (mm): 1205
Height (cm): 39
Perennation - primary
Life Form - primary
Clonality - primary
Count of 10km squares in Great Britain: 1
Count of 10km squares in Ireland: 0
Count of 10km squares in the Channel Isles: 0
Plantatt Conservation Status
RDB Species Accounts
Limonium transwallianum (Pugsley) Pugsley (Plumbaginaceae)
Rock sea-lavender, Lafant Penfro
Status in Britain: VULNERABLE. ENDEMIC.
This is another long-recognised member of the Limonium binervosum aggregate, although considerable confusion has arisen in the past between L. transwallianum and other segregates. It is now certainly recorded only from steep, south-facing Carboniferous limestone cliff-slopes at Giltar Point, Pembrokeshire. Associated species include Armeria maritima, Crithmum maritimum, Festuca rubra, Inula crithmoides, Limonium procerum ssp. procerum, Plantago coronopus and P. maritima. Alleged L. transwallianum from Linney Head to Stackpole Quay is probably referable to other taxa (L. britannicum ssp. transcanalis, L. parvum and L. procerum ssp. cambrense), whilst a rock sea-lavender in Co. Clare, Ireland, long suspected of being L. transwallianum, is now regarded as a segregate of L. recurvum (ssp. pseudotranswallianum).
All currently known populations of L. transwallianum lie within SSSIs and are not considered to be under significant threat. Close examination of other populations of L. binervosum agg. in Pembrokeshire may yet reveal further L. transwallianum; it is certainly a difficult taxon to separate in the field, although the narrow petals are said to be diagnostic (Stace 1991).
S. J. Leach
Atlas text references
Atlas Supp (46a)
1986. The Limonium binervosum aggregate (Plumbaginaceae) in the British Isles. Journal of the Linnean Society. 92:177-217.
1924. A new Statice in Britain. Journal of Botany. 62:129-134.
1999. British Red Data Books. 1. Vascular plants, edn 3.