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1a. Tidestromia suffruticosa (Torrey) Standley var. suffruticosa
Tidestromia suffruticosa var. coahuilana I. M. Johnston; T. gemmata I. M. Johnston
Leaf blades usually ovate (lanceolate, ovate, very widely ovate, or reniform). Internodes of secondary branches subtending involucres in fruit usually well defined and not crowded.
Flowering spring-fall (Apr-Oct). Primary and disturbed vegetation, desert shrub, mesa slopes, disturbed grounds, roadsides, in gypseous limestone, rocky, gravelly alluvial and limestone soils; 600-1500 m; Ariz., N.Mex., Tex.; Mexico (Chihuahua, Coahuila, Durango).
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