No key was found for the requested taxon, but it has only one child: Poteridium annuum. Showing where it is keyed below.

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Key to Rosaceae, Key B: Herbs and subshrubs with compound leaves

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Show caption*© Edwin Bridges
1 Leaves 2- to 3-ternately compound; [tribe Spiraeeae]
1 Leaves 1-compound, either simply pinnately compound or simply palmately compound,
  2 Principal (basalmost) leaves pinnately compound, with (3-) 5-many leaflets (upper stem leaves sometimes 3-foliolate).
    3 Principal leaves with leaflets of markedly disparate shape and size (large leaflets alternating with much smaller leaflets, or a large terminal leaflet and much smaller lateral leaflets).
      4 Lateral leaflets alternating between small and large, the terminal leaflet similar in size and shape to the larger lateral leaflets; terminal leaflet < 3 cm wide; hypanthium either conical or turbinate, armed with hooked bristles, the pistils 2, or hemispheric, the pistils >5.
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Show caption*© Nathan Aaron
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Show caption*© Erik Danielson
        5 Leaves glabrous or sparsely pubescent beneath; flowers many in racemes; hypanthium conical or turbinate, armed with hooked bristles, the pistils 2; [tribe Sanguisorbeae]
image of plant
Show caption*© Erik Danielson
        5 Leaves silvery sericeous beneath; flowers solitary and axillary; hypanthium hemispheric, the pistils >5; [tribe Potentilleae]
      4 Leaflets variable in size and shape, usually the terminal leaflet much larger than any of the lateral leaflets; terminal leaflet 3-20 cm wide; hypanthium either sauce-r-shaped or hemispheric to conical; pistils 5 or more.
image of plant
Show caption*© Gary P. Fleming
image of plant
Show caption*© Erik Danielson
          6 Pistils 5-15, in a circle on a saucer-shaped hypanthium, ripening into upright fruits that resemble follicles but are indehiscent; corolla white or pink; plant 10-20 dm tall; [tribe Ulmarieae]
image of plant
Show caption*© Will Stuart
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Show caption*© Paul Marcum
          6 Pistils many, densely covering the hemispheric to conical hypanthium, ripening into achenes terminated by the persistent style; corolla white, cream, pale yellow, bright yellow, lavender, maroon, or purple; plant 2-10 dm tall; [tribe Colurieae]
    3 Principal leaves with leaflets of generally similar shape and size (the lowest leaflets may be smaller but of similar shape and toothing to the other leaflets).
image of plant
Show caption*© harum.koh, some rights reserved (CC BY-SA), uploaded by harum.koh
             7 Stems and leaf rachises and petioles armed with retrorse prickles.
             7 Stems and leaves unarmed.
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Show caption*© Paul Marcum
image of plant
Show caption*© Gary P. Fleming
               8 Foliage and stems viscid-pubescent with brownish hairs; inflorescence a cyme; petals 5, cream-colored; [tribe Potentilleae]
               8 Foliage not viscid-pubescent (if hairy, the hairs not brown or viscid); inflorescence of very many (>100) small flowers in a spike, the rachis hidden by the tightly packed flowers; petals 0; [tribe Sanguisorbeae].
                 9 Leaflets pinnatifid (each leaflet incised nearly to the midvein); stamens 2 or 4 per flower
                 9 Leaflets toothed (the incisions not nearly to the midvein); stamens either 4 or 15-20 per flower (in well-developed, staminate flowers).
                   10 Leaflets 0.8-2 cm long; spike 1-2 cm long, 1-2× as long as broad, globose; stamens 15-20 per flower (in well-developed staminate flowers), the filaments 3-4 mm long; sepals green to pinkish-purple; [cultivated, occasionally escaped]
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Show caption*© Richard & Teresa Ware
                   10 Leaflets 3-10 cm long; spike 6-30 cm long, elongate; stamens 4 per flower, the filaments 8-10 mm long; sepals white (sometimes fading greenish); [native]
  2 Principal (basal-most) leaves palmately compound, with 3-7 (-9) leaflets.
image of plant
Show caption*© Gary P. Fleming
image of plant
Show caption*© Gary P. Fleming
                     11 Principal leaves subsessile, 3-foliolate; fruit of follicles; leaves cauline; [tribe Gillenieae]
                     11 Principal leaves distinctly petiolate, the petiole often longer than the leaflets, 3-7 (-9)-foliolate; fruit of achenes; leaves basal and cauline.
                       12 Principal leaves 5-7 (-9)-foliolate; [tribe Potentilleae]
image of plant
Show caption*© Scott Ward
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Show caption*© Erik Danielson
                          13 Petals maroon-colored, shorter than sepals; plants sprawling with horizontal stems bearing rooting nodes; [wetlands from n. PA, n. NJ, sc. IN and sc. OH northward]
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Show caption*© Douglas Goldman, some rights reserved (CC BY-SA), uploaded by Douglas Goldman
image of plant
Show caption*© Erik Danielson
image of plant
Show caption*© Gary P. Fleming
                          13 Petals yellow or white, not shorter than sepals; plants trailing or upright, if bearing horiztonal stems with rooting nodes then petals not maroon-colored and plants not in wetlands; [dry habitats, collectively widespread]
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Show caption*© Gary P. Fleming
                       12 Principal leaves 3-foliolate.
                            14 Plants in flower.
                              15 Petals yellow.
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Show caption*© Richard & Teresa Ware
                                16 Pistils 2-6; [tribe Colurieae]
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Show caption*© Joey Shaw
                                16 Pistils (10-) numerous; [tribe Potentilleae]
                              15 Petals white (or slightly pinkish).
                                  17 Calyx lobes not subtended by bractlets; [tribe Rubeae]
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Show caption*© Alan M. Cressler
                                  17 Calyx lobes subtended by 5 sepaloid bractlets; [tribe Potentilleae].
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Show caption*© Richard & Teresa Ware
                                    18 Leaves evenly serrate with many serrations; [widespread]
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Show caption*© Keith Bradley
                                    18 Leaves with 3 (-5) teeth at the apex, otherwise entire
                            14 Plants in fruit (or sterile).
image of plant
Show caption*© Gary P. Fleming
                                       19 Leaflets entire, except for 3 (-5) teeth at the apex; [tribe Potentilleae]
                                       19 Leaflets evenly serrate or crenate, each well-developed leaflet with > 7 teeth.
                                         20 Calyx lobes not subtended by bractlets.
                                           21 Fruit an aggregate of dry, non-adherent achenes; leaflets obtuse at apex; [tribe Colurieae]
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Show caption*© Erik Danielson
                                           21 Fruit an aggregate of fleshy, adherent drupelets; leaflets acuminate at apex; [tribe Rubeae]
                                         20 Calyx lobes subtended by 5 sepaloid bractlets; [tribe Potentilleae].
                                             22 Fruit an aggregate of dry achenes
                                             22 Fruit an accessory fruit of achenes borne on the surface of a fleshy, red receptacle.
image of plant
Show caption*© Alan M. Cressler
                                               23 Fresh fruit reddish inside; leaflets serrate, 2.5-12 cm long; sepaloid bracts narrowing to apex, untoothed
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Show caption*no rights reserved, uploaded by Alan Weakley
                                               23 Fresh fruit whitish inside; leaflets crenate, 2-4 cm long; sepaloid bracts widest at apex, 3-5-toothed