Abstract
Tulipa jacquesii sp. nov. (section Biflores, Tulipeae, Liliaceae), showing white tepals with a yellow spot, is endemic to West Kyrgyzstan. It differs from all other species by its nearly glabrous tepals, its fragrance, leaves (2) and flowers (up to 4) number. Its genome size is 51.9 pg, in agreement with the variation range (51.5–59.4 pg) known for other species of the same section. Peculiar are the ridges on the leaves of plants, reminiscent of T. regelii.