Compilation
Chrysopsis senilis

Variety senilis grows in southern New Mexico and trans-Pecos Texas; it is rare in southern Arizona and across northern Mexico. The most hispid form of the species, var. senilis, usually has numerous, spreading, large cilia along much or all of the leaf margins. The leaf margins are sometimes undulate, as in Heterotheca sessiliflora subsp. sessiliflora, and the two could be confused; the ranges do not overlap, however. The variety varies considerably in height and leaf size, and a number of collections are so reduced in size that they are easily mistaken for odd forms of H. villosa var. minor or H. viscida. Plants from southern Arizona often are similar to var. fulcrata. When hair density is high, leaf faces are obscured and the plants appear light grayish green; they could be confused with H. marginata.