Adenophyllum porophyllum (Cav.) Hemsl.

Unusually white-wooly haired population basally but fading to green up flowering stems. Plants in semi-shaded Quercus oblongifolia understory on volcanic alluvial substrate at mid canyon below western rim of Barranca Sirupa with Zinnia peruviana, Priva mexicana, Melampodium perfoliatum.

Note rayless, discoid heads, pectinate bracts and postulate glands. Plants in semi-shaded Quercus oblongifolia understory on volcanic alluvial substrate at mid canyon below western rim of Barranca Sirupa with Zinnia peruviana, Priva mexicana, Melampodium perfoliatum.

Note rayless, discoid heads with conspicuous pectinate bracts and pustulate glands. Plants in semi-shaded Quercus oblongifolia understory on volcanic alluvial substrate at mid canyon below western rim of Barranca Sirupa with Zinnia peruviana, Priva mexicana, Melampodium perfoliatum.

Note rayless, discoid heads with conspicuous pectinate bracts and pustulate glands. Plants in semi-shaded Quercus oblongifolia understory on volcanic alluvial substrate at mid canyon below western rim of Barranca Sirupa with Zinnia peruviana, Priva mexicana, Melampodium perfoliatum.

Note rayless, discoid heads with conspicuous pectinate bracts and pustulate glands. Plants in semi-shaded Quercus oblongifolia understory on volcanic alluvial substrate at mid canyon below western rim of Barranca Sirupa with Zinnia peruviana, Priva mexicana, Melampodium perfoliatum.

Presence in Chihuahua generally overlooked in technical literature

Presence in Chihuahua generally overlooked in technical literature