Related by context. Frequent words. (Click for all words.) 66 switchgrass 59 biomass 58 drought tolerant 58 jatropha 57 prairie grasses 55 cultivars 54 bioenergy 54 woody biomass 54 drought resistant 54 red clover 54 Jatropha 53 prairie grass 53 sweet sorghum 53 corn stover 53 ryegrass 52 sunflowers 51 Cellulosic ethanol 51 grasses 51 cultivar 51 poplar trees 50 oilseed rape 50 Biomass 50 sorghum 50 zinnias 49 begonias 49 corn cobs 49 crop residues 49 ornamental grasses 49 biomass fuels 49 biofuel crops 49 cellulosic ethanol 49 legume 49 crops 49 biochar 49 cannas 49 conifers 48 biofuel 48 shrub 48 flowering plants 48 butanol 48 impatiens 48 biofuels 48 bio ethanol 48 bioethanol 48 cowpea 47 Sunflowers 47 coleus 47 woody plants 47 viburnum 47 deciduous 47 dahlias 47 cellulosic 47 poplar 47 African violets 47 seedlings 47 cheatgrass 47 sunflower 47 rapeseed 46 chicory 46 hollies 46 pest resistant 46 leaved 46 petunia 46 sedum 46 camelina 46 biobutanol 46 grain sorghum 46 crape myrtle 46 resistant varieties 46 monocultures 46 biodiesel 46 fragrant flowers 46 clover 46 corn ethanol 46 daylilies 46 renewable 46 drought tolerant plants 46 shrubs 46 amaryllis 46 carbon sequestration 46 snapdragons 46 Biofuel 45 native grasses 45 aphids 45 legumes 45 cereal crops 45 ferns 45 Japanese maples 45 wheats 45 hydrangeas 45 Crops 45 asters 45 groundcover 45 cornstalks 45 deciduous trees 45 fruiting 45 safflower 45 wood pellets 45 plantings 45 sugar beet 45 sugar maples