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Keyed in multiple places:

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Key to Borreria

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1 Stems and branches many from the base of the plant; deltoid prickles (0.1-0.5 mm long) along the leaf blade midvein usually absent or 1-2 at the blade base; terminal inflorescence typically with 15-30 flowers; base of calyx ca. 1 mm wide; corolla tube 1.25-2.5 mm long; corolla limb (2.2-) 2.5-4.5 mm wide; corolla lobe ca. 1.5 mm wide at base, ca. 2 mm long; stamen exserted to 1.5-2 mm beyond tube apex (base of lobe); anthers 0.5-1 mm long; ovary (1.4-) 2-3.5 mm long, 1.0 mm wide; fruit (including persistent calyx lobe) 2.5-4 mm long
1 Stems single or many (especially when mowed) from the base of the plant, typically few to unbranched in the basal ½ of the plant; deltoid prickles (0.1-0.5 mm long) along the leaf blade midvein present throughout the blade; terminal inflorescence typically with 30-115 flowers; base of calyx ca. 0.5 mm wide; corolla tube 0.6-1.0 mm long; corolla limb 1.3-2.2 mm wide; corolla lobe ca. 1 mm wide at base, < 1.5 mm long; stamens exserted to 1.5 mm beyond tube apex (base of lobe); anthers <0.6 mm long; ovary 1-2 mm long, 0.7 mm wide; fruit (including persistent calyx lobe) 2-2.5 mm long

Key to Spermacoce

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1 Calyx with 4 lobes of nearly equal length.
  2 Flowers in terminal glomerules; stamens exserted; corolla white with a pink throat
  2 Flowers in axillary glomerules; stamens included; corolla white.
    3 Corolla villous in the throat; sepals rotate in fruit, long-deltoid, < 2× as long as width at base
    3 Corolla not villous in throat; sepals erect in fruit, narrowly triangular, > 5× as long as width at base
1 Calyx with 2 long lobes, the other 2 absent or vestigial (much shorter than the 2 long lobes).
      4 Terminal head (1-) 2-3 cm wide; leaves broadly elliptic, the blade 3-4 cm long, 1.2-1.5 cm wide, obtuse to rounded at the apex
      4 Terminal head 0.5-1 cm wide; leaves ovate to linear, acute at the apex.
        5 Leaves ovate-elliptic, with 3-5 pairs of lateral veins; calyx longer than the corolla
        5 Leaves linear to linear-lanceolate, with 1-2 pairs of lateral veins; calyx shorter than the corolla
          6 Flowers in a terminal head, and also at most in the next axil below; corolla tubes 1/5-2.5 mm long
          6 Flowers at 3 or more nodes; corolla tubes 0.5-1 mm long
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