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See list of 4 species in this genus
  • 1a. Leaf blades linear to narrow-oblanceolate, 2–5 mm wide, glabrous [Fig. 496]; calyx and axis of inflorescence glabrous [Fig. 496]
  • 1b. Leaf blades lanceolate or oblanceolate to elliptic, ovate, or triangular-ovate, the principal ones 10–87 mm wide, pubescent; calyx and axis of inflorescence hirsute
    • 2a. Schizocarp 4-lobed prior to separation, splitting into 4 mericarps at maturity; corolla white (less frequently blue)
    • 2b. Schizocarp 2-lobed prior to separation, splitting into 2 segments, each segment consisting of a pair of cohering mericarps; corolla blue to purple
      • 3a. Principal leaf blades lanceolate to oblanceolate, ca. 15 mm wide, sessile or short-petioled; plants perennial; mericarps tuberculate; cymes usually solitary at the ends 
of branches
      • 3b. Principal leaf blades ovate to triangular-ovate, 25–87 mm wide, long-petioled; plants annual; mericarps longitudinally striate; cymes usually 2–5 at the summit of a common peduncle

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 Show photos of:   Each photo represents one species in this genus.