Figure 1

Cytogenetic analysis of Senecio sect. Senecio taxa. A: S. eruciformis var. brachycephalus, diakinesis with 19 II + 2 I. B: S. eruciformis var. eruciformis, metaphase I with 20 II. C: S. grisebachii var. schizotus, diakinesis with 16 II + 1IV + 4 I. D: S. linariifolius var. subtomentosus, diakinesis with 18 II + 1 III + 1 I. E: S. glaber, diakinesis with 20 II. F: S. riojanus, prometaphase II with 20 chromosomes in each pole. G: S. ganganensis, prometaphase I with 20 II. H: S. goldsackii, metaphase I with 20 II. I: S. grisebachii var. leptotus, diakinesis with 20 II + 3 B chromosomes (1 IIB + 1 IB). J: S. brasiliensis var. tripartitus, diakinesis with 20 II. K: S. melanopotamicus, diakinesis with 20 II. L S. subulatus var. salsus, diakinesis with 34 II + 3 IV. M: S. viridis var. viridis, prometaphase I with 27 II + 5 IV + 1 III + 3 I, displaying evident secondary association of bivalents. N: S. microphyllus, metaphase I with 38 II + 1 IV + 2 IB. O: S. subulatus var erectus cytotype 2n = 40, late metaphase I with 20 II. P: S. subulatus var. erectus cytotype 2n = 80, diakinesis with 30 II + 5 IV. Asterisks indicate secondary association of bivalents; white triangles indicate univalents (I); line arrows indicate heteromorphic bivalents; black triangles indicate quadrivalents (IV); tick white arrows indicate trivalents (III); thick black arrows indicate B chromosomes; c: close bivalents; qi: interstitial chiasmata. Bars = 10 μm.