Numerical list
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3 flower
1. Prairie spiderwort. Tradescantia occidentalis
2. Dayflower. Commelina erecta
4 flower, outer parts longer than 1/2 in. Page 1
14. Evening primrose. Oenothera macrocarpa
17. Lavenderleaf evening primrose. Calylophus lavandulifolius
18. Hartweg's evening primrose. Calylophus hartwegii, ssp. fendleri
20. Plains yellow evening primrose. Calylophus serrulatus
21. Toothleaf evening primrose. Calylophus berlandieri
15. Cut-leaved evening primrose. Oenothera laciniata
23. Pale evening primrose. Oenothera albicaulis
24. Pale evening primrose. Oenothera latifolia
4 flower, outer parts longer than 1/2 inch. Page 2
25. Hooker evening primrose. Oenothera elata, ssp. hirsutissima
22. Common evening primrose. Oenothera biennis
12. Red horned poppy. Glaucium corniculatum
13. Western wallflower. Erysimum asperum
4 flower, outer parts shorter than 1/2 in. Page 1
5. Narrowleaf bluet. Hedyotis nigricans
7. Flax-leaved stenosiphon. Stenosiphon linifolius
8. Clammyweed. Polanisia dodecandra
9. Scarlet gaura. Gaura coccinea
10. Hairy gaura. Gaura villosa
11. Velvety gaura. Gaura parviflora
4 flower, outer parts shorter than 1/2 in. Page 2
26. Oval-leaf bladderpod. Lesquerella ovalifolia
27. Gordon's bladderpod. Lesquerella gordonii
31. Snow-on-the-mountain. Euphorbia marginata
33. Watercress. Nasturtium officinale
34. Catchweed bedstraw. Galium aparine
4 flower, outer parts shorter than 1/2 in. Page 3
36. Water speedwell. Veronica anagallis-aquatica
38. American bugleweed. Lycopus americanus
39. Purple ammania. Ammania coccinea
[Numerical index]