Abstract
Zinnia marylandica, an artificial hybrid betweenZ. angustifolia var.angustifolia (2n=22 female) andZ. violacea (2n=24, male), is described and illustrated.Zinnia marylandica is a stabilized amphiploid (2n=46) produced by colchicine-induced doubling of the sterile interspecific hybrids. It exhibits disease resistance to powdery mildew (Erysiphe cichoracearum), alternaria blight (Alternaria zinniae), and bacterial leaf and flower spot (Xanthomonas campestris pv.zinniae).
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