In a region so extensive very great varieties of climate are naturally to be expected, but it may be stated as a general law that the climate of Australia is milder than that of corresponding lands in the northern hemisphere.
Long; it is found in New England and the milder parts of Canada, and is frequently planted in Britain; its growth is extremely rapid in moist land; the buds are covered with a balsamic secretion.
During the milder interglacial period some southern types, such as Rhododendron ponticum, still held their own, but ultimately succumbed.
The climate is severe in the north and north-west parts, but the south and south-east districts are milder, while the most favoured part is the Lavant valley.
As in the case of quinine, the administration of small doses of hydrobromic acid often relieve the milder symptoms.