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Pilea
See list of 2 species in this genus-
1a. Achenes 1–1.5 mm wide, dark purple to purple-black except for a narrow, pale, marginal band, with raised, rounded tubercles on the surface [Fig. 923]; leaf blades relatively less lustrous and less translucent
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1b. Achenes 0.6–1.1 mm wide, largely green to yellow-green, often also with slightly raised purple marks [Fig. 924]; leaf blades relatively more lustrous and more translucent
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Each photo represents one species in this genus.