1 | Rhizomatous perennials, 50-130 cm high |
1' | Annuals, 5-50 cm high |
2 | Capitula terminal and lateral; peduncles generally elongate, slender; achenes c. 1 mm long; leaves flat or flattish |
2' | Capitula terminal on leafy branches and branchlets; peduncles short, not very distinct; achenes c. 1.5. mm long; leaf-margins strongly recurved or revolute |