Persistence: Tubers or Seeds?<BR>Purple nutsedge samples showed very limited intraspecific variation (RAPD). <BR>Seeds were produced, but none germinated. <BR>Yellow nutsedge samples showed a wide range of variation. <BR>17% of the flowers produced seed. <BR>Viable seed produced 2 wks after full bloom. <BR>78% of the seed germinated. <BR>Field studies indicate only 0.78% of seed established into a plant. <BR>Okoli et al. 1997<BR>Thullen and Keeley 1979<BR>Lapham and Drennan 1990<BR>