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Adaptive radiation is not a strictly vertebrate phenomenon, and examples are also known from among plants. The most famous example of adaptive radiation in plants is quite possibly the Hawaiian silverswords , named for alpine desert-dwelling Argyroxiphium species with long, silvery leaves that live for up to 20 years before growing a single ...
Argyroxiphium sandwicense subsp. sandwicense, the Mauna Kea silversword, [1] is a highly endangered flowering plant endemic to the island of Hawaiʻi (Big Island) of Hawaii.It is the "crown jewel" [2] of the volcanic mountain Mauna Kea, from which it derives its English name.
The last common ancestor of the silversword alliance was likely a mat and rhizome forming plant not more than .3 metres (0.98 ft) tall, with a chromosome number of 2n = 16, and perhaps another similar species. Species of Dubautia however have 2n = 14 chromosomes. How the silverswords' chromosome number arose is a matter of some uncertainty, but ...
Argyroxiphium is a small genus of plants in the family Asteraceae. [2] [3] Its members are known by the common names silversword or greensword due to their long, narrow leaves and the silvery hairs on some species. The silverswords belong to a larger radiation of over 50 species, including the physically different genera Dubautia and Wilkesia.
Argyroxiphium grayanum is a perennial plant endemic to the island of Maui in Hawaii. Its growth form is typically a low shrub up to 2 m high, erect, with an erect single-stemmed monocarpic rosette shape, though in the interior of bogs it typically grows as a dwarf shrub under 30 cm high.
An evolutionary radiation is an increase in taxonomic diversity that is caused by elevated rates of speciation, [1] that may or may not be associated with an increase in morphological disparity. [2] A significantly large and diverse radiation within a relatively short geologic time scale (e.g. a period or epoch ) is often referred to as an ...
There are many types of radiation including adaptive, concordant, and discordant radiation however escape and radiate coevolution does not always follow those specific types. Ehrlich and Raven's original paper did not clearly answer why ecological escape leads to increased diversification, however several explanations have been proposed.
The ancestor of A. kauense came to Hawai’i approximately 5 million years ago, where it underwent an adaptive radiation, leading to the 30 species within the silversword alliance. [10] The Mauna Loa silversword is most closely related to the Mauna Kea silversword. [11]