My third Oenothera ( O . biennis ) was an unexpected visitor.
3.
A . Lunaria annua, aka L . biennis, is usually biennial.
4.
"Hymenopappus biennis " is a biennial herb up to tall.
5.
"Crepis biennis " is a perennial herb up to 120 cm ( 48 inches ) tall.
6.
What suggested the second is a mystery, and many sources do refer to the plant as L . biennis.
7.
Another biennial that I often leave undisturbed, assuming it has chosen an appropriate spot, is the evening primrose ( Oenothera biennis ).
8.
Emboldened by my unexpected delight with O . biennis, I next turned to Missouri primroses ( O . macrocarpa ), and these are truly garden treasures.
9.
Budworm populations from Rocky Mountain regions south of the area of introgressive hybridization of spruce differ from " C . biennis " ( Stehr 1967 ).
10.
A few hair-covered stems exit from the top of the plant where the flowers grow, which is the easiest way to tell that the species is the Gaura biennis.
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