''Ionactis caelestis'', the Spring Mountain aster, is a rare North American species in the family

Asteraceae The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Commonly referred to as the aster, daisy, composite, or sunflower family, Compositae w ...

. It has been found only in southern Nevada in the western United States.Biota of North America Program 2014 county distribution map
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Description

''Ionactis caelestis'' is a small perennial shrub up to tall, with a thick woody taproot. The plant usually produces several

flower heads A pseudanthium (Greek for "false flower"; ) is an inflorescence that resembles a flower. The word is sometimes used for other structures that are neither a true flower nor a true inflorescence. Examples of pseudanthia include flower heads, compos ...

in a flat-topped array.Flora of North America, ''Ionactis caelestis'' P. J. Leary & G. L. Nesom, 1992. Spring Mountain ankle-aster, aster
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References

Astereae Flora of Nevada Plants described in 1992 {{Astereae-stub