Xanthisma spinulosum var. chihuahuanum (B.L. Turner & R.L. Hartm.) D.R. Morgan & R.L. Hartm.

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Xanthisma spinulosum var. chihuahuanum (B.L. Turner & R.L. Hartm.) D.R. Morgan & R.L. Hartm.

Xanthisma spinulosum var. chihuahuanum (B.L. Turner & R.L. Hartm.) D.R. Morgan & R.L. Hartm. in Sida 20: 1408. 2003 sec. Barkley & al. 2006

• =Machaeranthera pinnatifida var. chihuahuana B.L. Turner & R.L. Hartm. in Wrightia 5(8): 311. 1976 syn. sec. ???