This southwestern taxon has been treated as a species (Cr), subspecies (M), or variety (FNA 20, J, K) of drummondii. Plants are relatively short (3-8 dm versus 4-12 dm), with long minutely bracteate flowering branches (versus divaricate or ascending, often racemiform); rays are usually bluish-white (versus bright blue to lavendar); cypselae are strigillose (versus glabrous); 2n = 32 (FNA 20). S. texanum is virtually unknown east of the Mississippi Rv., except in Miss. and perhaps Ala. It may not even be verified in Mo. (Y). There have been several reports from Ky. (M), but these are erroneous or remain dubious.