Numerical list
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4 flower, outer parts longer than 1/2 in.
14. Evening primrose. Oenothera macrocarpa
17. Lavenderleaf evening primrose. Calylophus lavandulifolius
20. Plains yellow evening primrose . Calylophus serrulatus
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
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
38. American bugleweed. Lycopus americanus
39. Purple ammania. Ammania coccinea
[Numerical index]