Abstract
Within a nursery of big bluestem (Andropogon gerardii Wt.) from seed collections made in eastern South Dakota, 86% of the plants possessed fertile pedicellate spikelets. From 10 random culms of 462 plants representing 20 different collecetion sites, seed-bearing sessile and pedicellate spikelets were separated and weigbed. A highly significant difference was found among sites for pedicellate spikelet seed yield. Fertile pedicellate yield was poi but since it possesses slightly more pedicellate than sessile spikelets, it is feasible that seed production could be substantially increased by increasing pedicellate spikelet fertility. The objectives of this study were to determine, within a nursery ofeastern South Daota ecotypes, the frequency of occurrence and potential agronomic usefulness of plants possessing fertile pedicellate spikelets.
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