Unknown - Tell us
This plant is said to grow outdoors in the following regions:
Richmond, California
Grand Junction, Colorado
Austin, Texas
Hartweg's Sundrops Calylophus hartwegii subsp. filifolius is Endemic to Texas.
Hartweg's Sundrops Calylophus hartwegii subsp. fendleri is native to Texas and other States.
Hartweg's Sundrops Calylophus hartwegii subsp. filifolius is Endemic to Texas.
Hartweg's Sundrops Calylophus hartwegii subsp. fendleri is native to Texas and other States.