Encelia resinifera

Encelia resinifera, the sticky brittlebush, is a North American species of flowering plant in the sunflower family.

Encelia resinifera
Scientific classification
Kingdom:
Plantae
(unranked):
Angiosperms
(unranked):
Eudicots
(unranked):
Asterids
Order:
Asterales
Family:
Asteraceae
Genus:
Encelia
Species:
E. resinifera
Binomial name
Encelia resinifera
C.Clark
Synonyms[1]
  • Encelia frutescens var. resinosa M.E.Jones ex S.F.Blake not Encelia resinosa Brandegee

Distribution

The species is found at elevations between 1,100–1,700 metres (3,600–5,600 ft) in the states of Arizona and Utah, in the Southwestern United States.[2] It grows in soils derived from sandstone.[3]

Description

Encelia resinifera is a shrub ranging in height from 40–150 centimetres (1.3–4.9 ft). The trunk, which becomes fissured with age, supports slender stems.[3]

The leaves, which range between 10 and 25 mm in length, are ovate or lanceolate and are usually pointed at the tips.[3]

The yellow flowerheads are borne singly, appearing between May and July (late fall to mid-summer) in their native range. These have 8-13 ray florets.[3]

Subspecies

Two subspecies have been identified:

  • Encelia resinifera subsp. resinifera — button brittlebush.[4]
  • Encelia resinifera subsp. tenuifolia C.Clark — found in the Grand Canyon area. It has both leaves and ray laminae with a length that is more than three times their width.[3]

Taxonomy

Encelia resinifera was originally described as a variety of Encelia frutescens (Encelia frutescens var. resinosa) by M.E.Jones in 1913.[5] In 1998 it was reclassified as a distinct species by Curtis Clark.[3][6]

References
  1. Tropicos, Encelia resinifera C. Clark
  2. Biota of North America Program 2014 county distribution map
  3. "Encelia resinifera C. Clark". Flora of North America. efloras.org. Retrieved 2008-01-18.
  4. "Encelia resinifera C. Clark". PLANTS database. United States Department of Agriculture. Retrieved 2008-01-18.
  5. Jones, Marcus Eugene ex Blake, Sydney Fay 1913. Proceedings of the American Academy of Arts and Sciences 49(6): 364 description in Latin, specimen listing in English
  6. Clark, Curtis. 1998. Aliso 17(2): 201
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