Some Factors Affecting the Distribution of the Capreae Group of Salix in Gower

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Abstract
An acc. is given of the distr. of the Capreae group of Salix, comprising the spp. caprea, atrocinerea and aurita, and their hybrids inter se, in the Gower Peninsula (S. Wales), a limestone area covered by a thin veneer of drift. S. caprea occurs sparsely in well-drained upland situations, pH 5.8-7.3; aurita in high water-logged regions, pH 4.1-4.8; and atrocinerea commonly in all low-lying wet situations, pH 4.5-6.5. Swarms of caprea X atrocinerea hybrids occur in regions of approx. neutral pH where the boulder clay thins out upon limestone. Rooting characteristics are also discussed in relation to distr. Shoots of aurita and atrocinerea root easily in stagnant cultures; caprea roots reluctantly only with aeration, which explains the occurrence of this sp. where the soil-type tends to be oxidizing.

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