Words similar to capitula
Example sentences for: capitula
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According to Bremer and Humphries [ 2 ] , the Artemisia -group is monophyletic and defined by heterogamous-disciform capitula (disk florets usually bisexual and fertile, ray florets pistillate) or homogamous-discoid capitula (disk florets usually bisexual and fertile, ray florets absent), pollen with short or no spines (associated with anemophily), and thick-walled cypselas devoid of ribs (sometimes faint ribs are present in Sphaeromeria and Crossostephium ). All of the Artemisia -group genera contain species that have been variously placed within the taxonomic boundaries of Artemisia s.l.
Seriphidium as a distinct genus along with several small genera from within the boundaries of Artemisia s.l . The more recent, major classifications [ 2 39 49 50 ] have agreed with the segregation of Seriphidium on the basis of discoid-homogamous capitula and recognized the smaller segregate genera as well.
It is apparently defined taxonomically on the basis of plesiomorphies (heterogamous, disciform capitula with perfect/fertile disk florets and pistillate ray florets), and needs to be re-circumscribed.
Tridentatae is characterized by discoid-homogamous capitula, with the exception of S. bigelowii , which has occasional heterogamous-disciform capitula of one pistillate ray floret and two perfect disk florets - a character that was previously considered a plesiomorphy or secondary reversal in S. bigelowii [ 2 ] . Based on ITS and chloroplast phylogenies of sect.
In Artemisia s.l ., the typical limb of the Anthemideae-type ray florets are reduced to a membranous vestige, giving the impression that the small capitula are composed only of disk florets, referred to as disciform capitula (inflorescence) by Bremer and Humphries [ 2 ] . In other members of the genus, the ray flowers are absent, thus the capitulum is composed only of disk florets, i.e ., discoid.
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