Encelia resinifera
| Encelia resinifera | |
|---|---|
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Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Genus: | Encelia |
| Species: | E. resinifera
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| Binomial name | |
| Encelia resinifera | |
| Synonyms[1] | |
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Encelia resinifera, the sticky brittlebush, is a North American species of flowering plant in the family Asteraceae.
Distribution[edit]
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[edit]
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[edit]
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[edit]
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[edit]
- ^ Tropicos, Encelia resinifera C. Clark
- ^ Biota of North America Program 2014 county distribution map
- ^ a b c d e f "Encelia resinifera C. Clark". Flora of North America. efloras.org. Retrieved 2008-01-18.
- ^ "Encelia resinifera C. Clark". PLANTS database. United States Department of Agriculture. Retrieved 2008-01-18.
- ^ 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
- ^ Clark, Curtis. 1998. Aliso 17(2): 201
