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Common broomweed (Arr&r&z&@&~ @C.)Nutt.) behaves both as a winter and as a summer annual. Seeds germinate ln either autumn or spring, and the life cycle is completed the following autumn. Seeds were nondormant at maturity, and 48 to 945 of them germirmted in light at daily thermoperiods of X5/6, 20/10,25/15,30/15 and 35/2oOC, but 42% or less germinated in darkness at these temperatures. Thus, a high percentage of the seeds dispersed in early autumn germhute within a few days in warm soil if soil water is not limiting. With late autumn dispersal, however, germination of a high percentage of the seeds ls delayed until spring. Vernalization was not required for flowering, and both vernalized and nonvernalized plants flowered under long and

Ecophysiology of Seed Germination and Flowering in Common Broomweed, Amphiachyris dracunculoides (DC) Nutt