Encelia resinifera

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

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

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 .[3][6]

References[]

  1. ^ Tropicos, Encelia resinifera C. Clark
  2. ^ Biota of North America Program 2014 county distribution map
  3. ^ Jump up to: a b c d e f "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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