However, some Bulbophyllum species attract male fruit flies solely via a floral chemical which simultaneously acts as a floral reward (e.g. methyl eugenol, raspberry ketone, or zingerone) to perform pollination. The flowers may produce attractive odours. Although absent in most species, nectar may be produced in a spur of the labellum, or on the point of the sepals, or in the septa of the ovary, the most typical position amongst the Asparagales.