May-August

17. Lavenderleaf evening primrose, Calylophus lavandulifolius
18. Hartweg's evening primrose, Calylophus hartwegii, ssp. fendleri
59. Stiffstem flax, Linum rigidum var. compactum
86. Bigbract verbena, Verbena bracteata
121. Pincushion cactus, Coryphantha vivipara
210. Scarlet pea, Indigofera miniata var. leptosepala
229. Gilia penstemon, Penstemon ambiguus var. ambiguus
238. Roundleaf Monkey-flower, Mimulus glabratus var. fremontii

45. Cursed crowfoot, Ranunculus scleratus
46. Pokeweed, Pokeberry, Phytolacca americana
58. Purple poppy mallow, Callirhoe involucrata
69. Common mallow, Malva neglecta
70. Dakota verbena, Verbena bipinnatifida
88. Buffalo-burr nightshade, Solanum rostratum
89. Ground saracha, Chamaesaracha coniodes
90. Plains chinese-lantern, Quincula lobata
96. Field bindweed, Convolvulus arvensis
130. Engelmann's daisy, Engelmannia pinnatifida
131. Plains blackfoot, Melampodium leucanthum
153. Rose-ring gaillardia, Indian blanket flower, Gaillardia pulchella
159. Cutleaf ironplant, Haplopappus spinulosus
160. Western fleabane, Erigeron bellidiastrum
200. Yellow sweetclover, Melilotus officinalis
259. Black medic, Medicago lupulina
267. Nettle leaf noseburn, Tragia ramosa

47. Velvet leaf, Abutilon theophrasti
71. Wild four-o'clock, Mirabilis nyctaginea

201. Lemon scurf-pea, Psoralea lanceolata
230. White penstemon, Penstemon albidus

June-July

5. Narrowleaf bluet, Hedyotis nigricans
92. Buffalo gourd, Cucurbita foetidissima
101. Showy milkweed, Asclepias speciosa
154. Black sampson echinacea, Echinacea angustifolia
178. Prickly sowthistle, Sonchus asper
232. Western spotted beebalm, Monarda punctata
233. Lemon beebalm, Monarda citriodora
255. Sensitive brier, Schrankia nuttallii
260. Illinois bundleflower, Desmanthus illinoensis
271. Lead plant, Amorpha canescens
281. Purple prairie clover, Dalea purpurea