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Lappula
See list of 2 species in this genus-
1a. Mericarp bodies (i.e., excluding the prickles) 2–3 mm long, with a single row of prickles around the margin, the prickles with more or less confluent bases; calyx 3–3.5 mm long in fruit; corolla 1.5–2.5 mm wide
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1b. Mericarp bodies 3–4 mm long, with 2 (rarely 3) rows of prickles around the margin, the prickles distinct; calyx 2.5–3 mm long in fruit; corolla 2–4 mm wide
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Each photo represents one species in this genus.