the morphological variation and the relationships between its different populations from four different locations in the central region of the Kingdom of Saudi Arabia. Detailed descriptions of the achene surface were given for each taxon. The results indicated that the

May 1, 2023 · The relative uniformity of the organogenesis process across all plants then explains the prevalence of certain patterns in plants, i.e. Fibonacci phyllotaxis.

Sep 3, 2024 · From pine cones to spiral galaxies, fascinating patterns of the Fibonacci sequence occur naturally in nature. Find out how this ancient sequence manifests in our world and beyond. (Credit: Kate Babiy/Shutterstock) Nature is disordered, messy, chaotic.

Sep 1, 2023 · The best-known example of the spiral phyllotaxis pattern is the sunflower inflorescence (Fig. 1 A), in which the discrete element is an achene (or a flower in early stage). The example of a sunflower inflorescence clearly shows the difference between a discrete element and a continuous plant.

Central (disk) florets yield achenes that are lighter, more numerous, and bear a pappus that aids wind transport, and rows of trichomes that aid animal transport (Fig. 1 a). Marginal (ray) florets yield achenes that are heavi-er, less numerous, and lack obvious dispersal structures (Fig. lb).

In total, eight quantitative morphological characters were evaluated: length and width of achene body; index length/width of achene bod... ... lettuce can only reproduce sexually, producing...

Feb 15, 2013 · Average length and width of Helianthus annuus achenes collected from 65 free-living populations in three regions of North America: West (open circles—27 populations); Central and Eastern (closed circles—27 populations) and Texas (open squares—11 populations).

Jan 28, 2024 · A description of the achene of each species, a key to the investigated taxa based on morphological and anatomical features, as well as drawings of cross sections, are provided, and SEM micrographs of achenes are provided.

Download scientific diagram | Micrographs of the internal structure of sunflower achenes: (a) polished cross section of the resinembedded archaeological achene, and (b) SEM cross section of an...

cypsela. For these authors, the achene is a fruit originating from an inferior and bicarpellate ovary, monospermic, with the central area not divided into locules, with modifications of the calyx into a pilose or aristate pappus, and exemplified only by species of Asteraceae.