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See list of 2 species in this genus

Reference: Small (1978).

  • 1a. Plants annual; larger leaf blades commonly 5- to 9-lobed, with very narrow sinuses, without glandular dots; carpellate spikes with spinulose-ciliate bracts that are narrow and do not completely conceal the fruits; anthers without glands
  • 1b. Plants perennial; larger leaf blades commonly 3- to 5-lobed, with broad and open sinuses, gland-dotted on the abaxial surface; carpellate spikes with entire-margined bracts that are broad and conceal the fruits [Fig. 542]; anthers glandular

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