Abstract
Seeds (achenes) of the annual sedge Cyperus inflexus Muhl. (Cyperaceae) were dormant at maturity. Dormancy was overcome by stratification, scarification, and soaking of the seeds in solutions of certain N-compounds. In all cases light was found to be necessary for germination, and none of the treatments used in this study substituted for the light requirement. Stratified seeds germinated better at daily alternating temperatures (28-18 C) than at constant temperatures (28 or 18 C). Nonstratified seeds that were mechanically scarified at the embryo end or acid scarified gave good germination at 28 and 28-18 C. Chemicals that caused 75% or more of the seeds to germinate included thiourea, potassium nitrite, and hydroxylamine. The germination requirements of C. inflexus are considered in relation to its ecological life history and to its cedar glade habitat.
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