Pea flowers

3 leaflets
200. Yellow sweetclover, Melilotus officinalis
202. White sweetclover, Melilotus alba
203. Wild alfalfa, Psoralea tenuiflora var. tenuiflora

5 leaflets

209. Tallbread scurf-pea, Psoralea cuspidata

more than 5 leaflets
212. Slender milkvetch, Astragalus gracilis
213. Plume dalea, Dalea enneandra
215. Missouri milkvetch, Astragalus missouriensis
217. Woolly loco, Astragalus mollissimus
219. Silky sophora, Sophora nuttalliana
220. Wild licorice, Glycyrrhiza lepidota
224. Silktop dalea, Dalea aurea

Flower with a spur
225. Plains larkspur, Delphinium virescens

2-lipped flower.
230. White penstemon, Penstemon albidus
233. Lemon beebalm, Monarda citriodora
235. Pitcher's salvia, Salvia azurea
234. Common devil's claw, Proboscidea louisianica
237. Henbit deadnettle, Lamium amplexicaule
238. Roundleaf Monkey-flower, Mimulus glabratus var. fremontii
245. Northern frog fruit, Lippia lanceolata

Sickle-shaped flower
247. Lemon painted-cup, Castilleja purpurea var. citrina

Flower different from any of the above
66. Hoary vervain. Verbena stricta
87. Blue verbena. Verbena hastata
245. Northern frog fruit, Lippia lanceolata