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See list of 3 species in this genus

Reference: Nesom (2001).

  • 1a. Leaf blades decurrent on the stem as thin wings [Fig. 446], acuminate at the apex
  • 1b. Leaf blades not decurrent on the stem, obtuse to acute at the apex
    • 2a. Stems usually with persistent, white tomentum, sometimes only sparsely so, appearing gray or gray-green, eglandular or infrequently stipitate-glandular near the base; capitula wth 4–8 bisexual flowers and 38–96 carpellate flowers; plants relatively inodorous
    • 2b. Stems rapidly losing most of the white tomentum, appearing green, covered with abundant stipitate glands 0.1–0.2 mm tall; capitula with (7–) 11–20 bisexual flowers and 47–78 carpellate flowers; plants fragrant

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