Encelia resinifera
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| Encelia resinifera | ||||||||||||||
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| Encelia resinifera C.Clark |
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Encelia frutescens var. resinosa M.E.Jones ex S.F.Blake |
Encelia resinifera (sticky brittlebush) is a species of flowering plant in the family Asteraceae, native to the United States.
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[edit] Description
This species is a shrub ranging in height from 40 to 150 cm. The trunk, which becomes fissured with age, supports slender stems. The leaves, which range between 10 and 25 mm in length, are ovate or lanceolate and are usually pointed at the tips. 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.[1]
[edit] Taxonomy
E. resinifera was originally described as a variety of E. frutescens (E. frutescens var. resinosa) by M.E.Jones in 1913. In 1998 it was reclassified as a species in its own right by Curtis Clark.[1]
Two subspecies have been identified, as follows:
- E. resinifera subsp. resinifera - button brittlebush[2]
- E. resinifera subsp. tenuifolia C.Clark, which is found in the Grand Canyon area. This subspecies has both leaves and ray laminae with a length that is more than three times their width.[1]
[edit] Distribution
The species is found at elevations between 1100 and 1700 metres in the states of Arizona and Utah in soils derived from sandstone.[1]
