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  Psilactis A. Gray

  Asters 

A small southwestern U.S. and Mexican genus of six species following Morgon (1993; Syst Bot 18: 290-308.) differing from other Symphyotrichinae.  Species are annuals, biennials or rhizomatous perennials and have dimorphic cypselae with the ray fruit lacking a well developed crown of bristles.  Species have been included in Machaeranthera (in the broad sense) in the past (Turner & Horne 1964).

  • Psilactis asteroides
  • Psilactis brevilingulata
  • Psilactis gentryi
  • Psilactis heterocarpa
  • Psilactis odysseus
  • Psilactis tenuis

 

Dimorphic cypselae (ray floret fruit lacks pappus bristles; P. tenuis)

Last update 26 October 2005 by J.C. Semple          © 2005, J.C. Semple