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>