Encelia resinifera
Aliso 17: 201. 1998.
Endemic
Basionym: Encelia frutescens var. resinosa M. E. Jones ex S. F. Blake Proc. Amer. Acad. Arts 49: 364. 1913,
Synonyms: Encelia resinifera subsp. tenuifolia C. Clark
Shrubs, 40–150 cm. Stems with slender branches from trunks, glabrate, developing fissured barks. Leaves cauline; petioles 2–6 mm; blades green, lanceolate to ovate, 10–25 mm, apices usually acute, sometimes obtuse, faces strigose, gland-dotted. Heads borne singly. Peduncles strigose to glabrate. Involucres 5–11 mm. Phyllaries lanceolate. Ray florets 8–13; corolla laminae 8–12 mm. Disc corollas yellow, 5–6 mm. Cypselae 5–8 mm; pappi 0. 2n = 36.
Phenology: Flowering May–Jul, Sep.
Habitat: Sandstone-derived soils
Elevation: 1100–1700 m
Discussion
Plants of Encelia resinifera from the Grand Canyon of the Colorado with lengths of leaf blades and ray laminae at least three times their widths are subsp. tenuifolia.
Selected References
None.
Lower Taxa
None.