Words similar to seriphidium
Example sentences for: seriphidium
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Nonetheless, these four genera are always considered closely related to it [ 2 33 37 38 55 ] . Artemisia s.s . and Seriphidium are composed of approximately 380 and 140 species, respectively, and are geographically widespread.
Old World Seriphidium species being equivocal [ 34 35 ] . The current ITS phylogeny suggests that the closest relatives of Tridentatae lie among the New World species of Artemisia , in agreement with McArthur and Plummer [ 20 ] , perhaps sharing a common ancestry with A. filifolia and A. californica , in addition to Sphaeromeria , although monophyly for this subclade is unsupported by the ITS data.
Kaschgaria was removed by Poljakov from Artemisia s.l . on the basis of stellate corolla hairs, and was considered more closely related to Seriphidium than Artemisia s.s ., even though it is disciform rather than discoid [ 2 ] . Kaschgaria possesses spineless pollen [ 2 37 ] . Therefore, placement of Kaschgaria and Elachanthemum outside of the Artemisia -group is intriguing because if these placements remain robust, wind-pollination may have arisen more than once in the tribe, or insect-pollination may be secondarily derived within Subtribe Artemisiinae in the radiate genera (clade 3 of Fig.
Seriphidium is clearly embedded as two distinct clades within Artemisia in the molecular phylogenies, making a sister group relationship unlikely.
A complex scenario for the origin and diversification of Artemisia and Seriphidium , and subsequent parallel evolution of the two genera in the Old and New Worlds, was proposed by Ling [ 39 49 ] . The putative common ancestor to both "sister genera" was hypothesized to have existed in northern Asia, based on reported fossil pollen records that date the taxa to the early Oligocene or lower Eocene of the lower Tertiary, with speciation accompanied by migrations during the Tertiary and Quaternary periods - forced southward by the advancing polar ice sheets.
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