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A class of algae, common in cold waters along continental coasts. Species colour varies from dark brown to olive green, depending upon the proportion of brown pigment (fucoxanthin) to green pigment (chlorophyll).
Brown algae vary in form and size from small filamentous epiphytes (Ectocarpus) to complex giant kelps that range in size from 1 to more than 100 metres (3.3 to 330 feet; Laminaria, Macrocystis, Nerocystis). Other brown algae can be found attached to rocky coasts in temperate zones (Fucus, Ascophyllum) or floating freely (Sargassum). Freshwater species are rare. Brown algae multiply by asexual and sexual reproduction; both the motile zoospores and gametes have two unequal flagella. Some seaweed species have gas-filled bladders (pneumatocysts), which keep photosynthetic parts of the algal thallus floating on or near the surface of the water.
a large Scottish horticultural society founded in Edinburgh in 1933. It promotes the cultivation, study, and preservation of alpine, rock garden, woodland, and bulb plants. Operating as a registered charity, it connects an international community of plant enthusiasts.
a genus of southern African herbs of the Acanthaceae family with showy flowers of usually red, pink, or white distinguished by a spurred calyx and irregular corolla
a very large family of highly specialized perennial herbaceous monocotyledonous plants. Plants are distributed throughout the world, especially in wet tropics.
A family of trees and shrubshaving the staminate flowers in cymose heads or drooping aments and pistillate flowers with an urn-shaped to oblong perianth that occur singly or in clusters and are succeeded by one-seeded nuts
any of a genus (Polygonum) of herbs of the buckwheat family with a prominent tubular sheath around the base of each petiole, thickened nodes, and flowers that are solitary and axillary or in spiked racemes
a family of mostly herbaceous plants having chiefly opposite or whorled leaves and flowers with one-seeded carpels that separate individually from a central column when ripe
