I a. Heads 3—5 mm wide, in small, terminal, slender, rigid panicles; corolla of marginal flowers tubular, with a 3-dentate apex, receptacle hemispheric ................. 1. D. bicolor b. Heads 5—6 mm wide, on long rigid peduncles in the axils of the highest leaves; corolla of marginal flowers with a very short tube and a widely campanulate 3-fid limb, receptacle with a hemispheric lower part and a conical upper part ................ 2. D. chrysanthemifolia