"Polygonum" Quotes from Famous Books
 ... between the arctic and alpine climates. The following circumpolar species are common, and widely diffused throughout the whole of the Alps: Silene acaulis, Dryas octopetala, Saxifsaga oppositifolia, S. aizoides, S. steliaris, Erigeron alpinus, Azalea procumbens, M. yosotis alpestris, Polygonum viviparum, Salix retusa, S. herbacea, Phleum alpinum, Juniperus nana. The proportion of northern forms, as regards both species and individuals, increases as we ascend to the higher regions. In the highest vegetation-zone, the snow-region — i.e. on islands ...
— Project Gutenberg Encyclopedia |
