Figures (3)  Tables (1)

    • Figure 1. 

      Geographical distribution of Zinnia species. Dots on the map indicate the locations where Zinnia species were collected. Blue dots indicate section Zinnia, green dots indicate section Mendezia, orange dots indicate section Tragoceros, and yellow dots indicate subgenus Diplothrix. Data sourced from the Global Biodiversity Information Facility (GBIF), accessible at www.gbif.org. This information is also presented in Supplementary Data 1.

    • Figure 2. 

      Chromosome count (2n) distribution of Zinnia. Chromosome count (2n): Represents the number of chromosomes observed in the genus Zinnia. The bar chart illustrates the frequency distribution of different chromosome numbers, with the horizontal axis representing chromosome numbers and the vertical axis representing the frequency of species.

    • Figure 3. 

      Variation of flower color and flower shape of Zinnia. (a)−(h) Flower color: solid type; (i)−(u) bi-color type. (a)−(e), (i)−(u) Flower shape: single to double type; (f) scabious type; (g) cactus type.

    • Subgenus Subsection Species Polyploidy Base chromosome count[33,34]
      I. Zinnia Zinnia Z. elegans Jacq. Diploid n = 12
      Z. peruviana (L.) L. Diploid n = 12
      Z. haageana (DC.)
      A. Gray.      		 Diploid n = 12
      Mendezia Z. angustifolia Kunth Diploid n = 11, 12
      Z. bicolor (DC) Hemsley. Diploid n = 11
      Z. purpusii Brandegee. Diploid n = 12,13
      Z. tenuis (S. wastson) Strother. Diploid n = 9
      Z. maritima HBK. Diploid n = 12, 13
      Z. leocoglossa S. F. Blake. Diploid n = 11
      Tragoceros Z. americana (Mill.) Olorode. & A. M. Torres. Diploid n = 11
      Z. flavicoma (DC.) Olorode. & A. M. Torres Diploid, Tetraploid n = 11, 22
      Z. venusta (A. M. Torres) Olorode & A. M. Torres. ? n = ?
      Z. zinnioides (Kunth) Olorode & A. M. Torres. Diploid n = 11
      Z. microglossa (DC.) McVaugh. Diploid n = 11
      II. Diplothrix / Z. acerosa (DC.) A. Gray. Diploid, Tetraploid n = 10, 11,
      19, 20
      Z. austrotexana B. L. Turner. Diploid n = 10 + 1
      Z. guanajuatensis (Calderón. & Rzed.)
      B. L. Turner.      		 ? n = ?
      Z. coahuilana B. L. Turner. ? n = ?
      Z. citrea A. M. Torres. Tetraploid n = 20
      Z. anomala A. Gray. Octoploid n = ± 42
      Z. grandiflora Nutt. Tetraploid n = 21, 24
      Z. juniperifolia (DC.) A. Gray. Diploid, Tetraploid n = 10, 20
      Z. oligantha I. M. Johnst. Diploid n = 10
      Z. zamudiana Calderón. & Rzed. ? n = ?

      Table 1. 

      Species of Zinnia and their base chromosome count.