Subshrubs


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Subshrubs

 

low-growing plants (5-60 cm tall) with lignified perennial, usually profusely branched shoots and no clearly expressed main trunk. Subshrubs often have a long rootstock (for example, bilberry and mountain cranberry); some have creeping shoots (cranberry). Sometimes, particularly in the high mountains, subshrubs assume a pulvinate form (Diapensia lap-ponica). The principal aboveground shoots live five to ten years. Subshrubs predominate in the vegetation cover of the tundras (species of birch and willow and many Ericaceae); they sometimes form a solid layer in coniferous forests. Subshrubs predominate in sphagnum marshes (cranberry, bog whortleberry, marsh andromeda, leatherleaf, and rhododendron) and form the vegetation of such wastelands as the heaths in Western Europe. They grow in the high mountains of South America, South Africa, and New Zealand, as well as in the Pamirs.


Subshrubs

 

perennial plants in which the lower parts of the shoots bearing the renewal buds become woody and live for several years while the upper parts remain grassy and die each year (unlike in shrubs and undershrubs). Subshrubs are usually not more than 80 cm high; in rare cases they reach a height of 150–200 cm. They differ from perennial grasses in that their renewal buds are normally several centimeters above the ground. Subshrubs are found primarily in arid regions. The position of the buds above the ground protects them from overheating in the scorching soil. Examples of subshrubs are Ceratoides and many species of steppe and desert wormwoods, vetches, and saltworts (Halocnemum, Kalidium). An example of a particularly small subshrub is the creeping plant thyme.

References in periodicals archive ?
broad-leaved suffrutescent climbers of montane forest and tree-line ecotone and erect or ascending herbs or subshrubs with narrow subcoriaceous leaves of high-altitude paramo.
has 25 species of perennial herbs or subshrubs distributed in tropical and warm regions, especially Africa.
Subshrubs, shrubs, perennial herbs, vines or small trees, monoecious, dioecious, or gynodioecious.
Perennials and subshrubs with yellow, orange, or red flowers along stems.
Although the community is dominated by shrubs, the majority of species were herbaceous species, subshrubs, or small succulents.
Subshrubs rhizomatous, single to few-branched stems.
Herbs annual or perennial or subshrubs, branched to unbranched.
Herbs perennial, subshrubs or shrubs, sometimes cushion-like, frequently with brachyblasts and macroblasts.
Evergreen herbs and subshrubs, or echlorophyllous, mycotrophic herbs.
They are herbs, terrestrial, epiphytic (erect or pendent), or, rarely, saxicolous shrubs and subshrubs 1-2 m tall, lianas, cushion plants, prostrate mat-forming chamaephytes, and trees to 20 m tall (for trees see Judd, 1984; Sorensen, 1995).
Many of the members are succulent subshrubs with thick, unbranching stems, which, unlike those of other members of the alliance, may develop woodiness and/or cork.
Corolline corona absent; trees, shrubs, or lianas (the latter often with tendrils), rarely rhizomatous subshrubs Willughbeieae 6.