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Example sentences for: bigelowii
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Sphaeromeria also has heterogamous-disciform capitula with pistillate ray and perfect disk florets, as does heterogamous-disciform S. bigelowii , suggesting that it is indeed a plesiomorphy.
Tridentatae [ 68 ] , and may explain occasional heterogamous disciform capitula in S. bigelowii [ 34 35 ] . However, there may be many genetic and developmental mechanisms that affect ray formation and control floret fertility [ 69 70 ] .
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.
The occasional appearance of disciform capitula in S. bigelowii might be explained by introgression of genes or alleles from A. filfolia that control ray expression, a phenomenon observed in discoid Senecio squallidus and radiate S. vulgaris in Europe [ 67 ] . While this is speculative, it is consistent with hypotheses that hybridization and introgression are widespread in sect.
Tridentatae , we previously concluded [ 34 35 ] that S. bigelowii was perhaps misplaced and should be excluded from the Tridentatae . In addition, we explained [ 34 35 ] an unexpected relationship between it and A. filfifolia as possible hybridization and introgression involving bidirectional gene flow rather than recent common ancestry because heterogamous-disciform A. bigelowii differs from heterogamous-disciform A. filifolia by perfect disk florets instead of female-sterile disk florets.
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