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Key to Hedeoma

Lamiaceae

Hedeoma

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1
Leaves narrowly ovate to elliptic, 3.5-11 mm wide, slightly to strongly crenate; nutlets subglobose.
  2
Leaves 14-23 mm long by 5-10 mm wide; calyces 5-8 mm long, the upper and lower teeth linear-subulate; cymes > 3 flowered; [west of the Mississippi River]
 ⇒ Hedeoma acinoides
  2
Leaves 25 mm long by 6-6.5 mm wide; calyces 4-5 mm long, the teeth dimorphic with the lower teeth linear-subulate and the upper lanceolate; cymes 1-4 flowered; [widespread in our region]
 ⇒ Hedeoma pulegioides
  3
Calyx teeth (upper and lower) strongly convergent, closing the orifice at maturity; plants (fresh) with scent of peppermint
 ⇒ Hedeoma drummondii var. drummondii
  3
Calyx teeth spreading (the upper) to slightly convergent (the lower), not entirely closing the orifice at maturity; scents various.
    4
Plants annuals, non-suffruticose; calyx teeth (upper and lower) widely spreading to recurved at maturity, the teeth not at all closing the orifice; cymes 2-8 flowered; nutlets ellipsoid, 0.6-0.7 mm wide by 1.2-1.5 mm long
 ⇒ Hedeoma hispida
    4
Plants suffruticose perennials; calyx teeth (upper and lower) erect to slightly spreading, the teeth incompletely closing the orifice; cymes 1-3(-8) flowered; nutlets oblong, 0.5-0.7 mm wide by 1.3-1.5 mm long
      5
Plants (fresh) with scent of lemon; calyces 6-8 mm long, calyx teeth (the upper) strongly recurved; corollas 10-15 mm long
 ⇒ Hedeoma reverchonii
      5
Plants (fresh) with scent of camphor; calyces 5-6 mm long, calyx teeth (the upper) slightly to strongly recurved; corollas 8-10 mm long
 ⇒ Hedeoma serpyllifolia