Germination in the new area occurs on many substrates, and light is essential for the germination of Rhododendron ponticum seeds (Cross 1975). 1095, E-41080 Sevilla, Spain and 2IRNA, CSIC, PO Box 1052, E-41080 Sevilla, Spain *Correspondence: Jose A. Mejias, Departamento 1993), and with an intermediate length in British seed material (1.5 mm; Cross 1975). Two subspecies have been recognized for the western (Iberian: R. ponticum L. ssp. The Edinburgh revision of Genus Rhododendron part authored by James Cullen did not recognise this subspecies. baeticum (Castroviejo et al. plants of the ssp. Rhododendron ponticum has two subspecies. ponticum (Davis 1978), 0.4 /0.8 mm for Iberian seeds of the ssp. An evergreen shrub or small tree, attaining a height of 25 ft in the wild; branchlets soon glabrous. baeticum is native to Spain and northern Portugal. Rhododendron ponticum L.. Synonyms: R. lancifolium Moench; R. speciosum Salisb. baeticum (Boissier & Reuter) Handel-Mazzetti) and eastern (Black Sea: R. ponticum L. ssp. Plio-Pleistocene relict Rhododendron ponticum subsp. ponticum) plants, but some controversy remains about this taxonomic differentiation and nomenclature (Chamberlain, 1982; López González, 1995). Leaves oblanceolate or elliptic-oblanceolate, 4 to 8 in. baeticum in southern Spain Jose A. Mejiasl*, Juan Arroyol and Teodoro Marafi6n2 1Departamento de Biologia Vegetal y Ecologia, Universidad de Sevilla, Apdo. Rhododendron is thought to have been introduced to Britain in 1763 from the Iberian Peninsula, although subsequent introductions occurred from the Black Sea region. baeticum to distinguish it from the Caucasus forms. The Iberian form of R. ponticum has been described as R. ponticum ssp. Subspecies ponticum is distributed from Bulgaria to Turkey and east to Georgia, whilst ssp. long, 1 to 2 1 ⁄ 2 in.

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