Growth & Development Germination stimulation by smoke but not by a butenolide Tersonia cyathiflora (Gyrostemonaceae) is a fire ephemeral with an obligate requirement for smoke to germinate. Downes et al. (pp. 381–384) find that this species does not respond to a butenolide from smoke that... Editor Pat Heslop-HarrisonAugust 11, 2010