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H1a, higher than 15 °C (59 °F), applies to tropical plants permanently under glass in heat; while H7, below −20 °C (−4 °F), applies to very cold-tolerant plants such as heathers. Most outdoor plants in the UK fall within the range H4, −10 to −5 °C (14 to 23 °F) (hardy in the average winter) to H5, −15 to −10 °C (5 to 14 °F ...
The ability to control intercellular ice formation during freezing is critical to the survival of freeze-tolerant plants. [3] If intracellular ice forms, it could be lethal to the plant when adhesion between cellular membranes and walls occur. The process of freezing tolerance through cold acclimation is a two-stage mechanism: [4]
This is a list of species in the plant genus Viola, often known as violets or pansies. Viola is the largest genus in the family Violaceae, containing over 680 species. [1] Although similarly named, neither African violets nor dogtooth violets are closely related to the true violas.
The flower of Viola reichenbachiana is bisexual, containing both male and female reproductive structures. [4] It has 3 or 5 narrow, non-overlapping petals that are a signature dull purple. [1] [4] The flower typically has 5 small, pointed sepals, 5 stamens, and 1 carpel. [1] These flowers can range from 1.5 to 2 cm across. [4]
Viola palmata is native to southeastern Canada as well as the eastern half of the United States. [ 2 ] [ 3 ] Often confused with Viola triloba , V. palmata is a member of a class familiarly known as "blue stemless violets", characterized by its cleistogamous flowers on short prostrate peduncles , and often concealed under dead leaves or soil.
Viola sempervirens, known by the common names redwood violet and evergreen violet, is a species in the genus Viola. It is native to the West Coast of the United States and British Columbia, Canada, and grows in closed-cone pine forest, California mixed evergreen forest, redwood forest, and Douglas fir forest communities. It has leathery purple ...
Viola labradorica, commonly known as alpine violet, [2] American dog violet, [3] dog violet [4] or Labrador violet, [3] [5] [6] is a perennial herbaceous flowering plant. It is native to Greenland, eastern Canada, and the eastern United States. [7] The plant sold as Viola labradorica by nurseries is Viola riviniana. [8]
Viola praemorsa is a species of violet known by the common names canary violet, [3] Astoria violet, [4] yellow montane violet, and upland yellow violet. [5] Description