Type of Scientific name Common Name Color Life Cycle Bloom Time Plant Onobrychis Sanfoin Legume Pink Perennial June to September Lotus corniculatus Birdsfoot trefoil Legume Yellow Perennial June to September Astragalus cicer Cicer milkvetch Legume White Perennial June to September Hedysarum boreale Northern sweetvetch Legume Pink Perennial May to June Ratibida columnifera Yellow prairie coneflower Flower Yellow Perennial June to September Cleome serrulata Rocky mtn beeplant Flower Pink/White Annual July to September Achillea millefolium Western yarrow Flower White Perennial July to September Linum lewisii Lewis flax Flower Blue Annual Mid May to September Gaillardia pulchella Indian blanket flower Flower Yellow/Red Perennial July to September Ratibida columnifera Mexican hat Flower Red/Orange Perennial June to September Sanguisorba minor Small burnet Flower Pink Perennial late May to June Machaeranthera tanacetifolia Prairie aster Flower Blue Biennial August to first freeze Helianthus maximiliani Maximilian sunflower Flower Yellow Perennial July to September Helianthus annuus Native annual sunflower Flower Yellow Annual August to September Phacelia tanacetifolia Phacelia Flower Purple/Blue Annual June to July Helianthus annuus Oil seed sunflower Flower Yellow Annual August to September Penstemon pameri Palmer penstemon Flower Pink/White Perennial May to July Penstemon strictus Rocky mnt penstemon Flower Purple/Blue Perennial May to July Coreopsis tinctoria Plains coreopsis Flower Yellow/Red Annual April to June Coreopsis lanceolata Lance-leaf coreopsis Flower Yellow Perennial April to June Rudbeckia hirta Black-eyed susan Flower Yellow Biennial June to September Asclepias speciosa Showy milkweed Flower Pink Perennial May to September Clarkia unguiculata Clarkia Flower Pink Annual May to June Clarkia pulchella Deerhorn clarkia Flower Pink Annual May to June Gilia capitata Globe gilia Flower Blue Annual April to June