Words similar to discoid
Example sentences for: discoid
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In addition, plants with discoid capitula are considered homogamous since all florets are of one sexual form (perfect-bisexual disk florets), and plants with disciform capitula are considered heterogamous with two or more sexual forms ( i.e., pistillate rays and perfect disks, or pistillate rays and staminate disks).
Furthermore, the tentative placement of disciform Kaschgaria and discoid Stilnolepis sister to the entire subtribe suggests that there may have been multiple origins for disciform, as well as discoid capitula.
The genera that comprise the Artemisia -group are closely related and were considered monophyletic on the basis of ancestrally, disciform-heterogamous capitula and spineless pollen, with discoid capitula secondarily derived by the loss of ray or marginal florets (Fig.
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.
Both genera are discoid with corymbose capitula, but whether either genus possesses spineless pollen (a synapomorphy for the Artemisia -group) or is wind-pollinated has not yet been determined [ 2 37 ] . Kaschgaria, a genus of two species from China and central Asia, is also placed outside of the Artemisia -group, but clearly within Subtribe Artemisiinae (94% probability) in the ITS phylogeny.
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