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As an example, Quebec City in Canada is located in zone 4, but can rely on a significant snow cover every year, making it possible to cultivate plants normally rated for zones 5 or 6. But, in Montreal, located to the southwest in zone 5, it is sometimes difficult to cultivate plants adapted to the zone because of the unreliable snow cover.
In phytogeography, concerned with the geographic distribution of plant species, floristic provinces are used. The Sierra Nevada are primarily within the California Floristic Province, with the Rocky Mountain Floristic Province to the north, the Great Basin Floristic Province to the east, and Sonoran Floristic Province to the south.
The alpine zone begins near 10,500 feet (3,200 m) elevation (in the southern Sierra) and near 9,000 feet (2,700 m) (in the north). [9] This zone is easily distinguished as it is above the tree line. No trees grow in this zone due to the harsh climatic conditions. Short, cool summers with long, cold, and snowy winters are typical at these ...
Tall shrubs are mostly 2–8 m high, small shrubs 1–2 m high and subshrubs less than 1 m high. [ 3 ] There is a descriptive system widely adopted in Australia to describe different types of vegetation is based on structural characteristics based on plant life-form , as well as the height and foliage cover of the tallest stratum or dominant ...
Shrubs tend to be small, and low growing to cope with high wind conditions and dense snowcovering, forming mats and cushions. Woody shrubs together with annuals constitute only about 6% of the number of Sierra Nevada alpine floral species. [1] Whitestem goldenbush (Ericameria discoidea)
They grow as woody shrubs with thick, leathery, evergreen and often small leaves. The plants are typically drought resistant, with some exceptions. [3] After the first rains following a fire, the landscape is dominated by small flowering herbaceous plants, known as fire followers, which die back with the summer dry period.