Encelia resinifera
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Encelia resinifera, the sticky brittlebush, is a North American species of flowering plant in the family Asteraceae.
Distribution
The species is found at elevations between Script error: No such module "convert". in the states of Arizona and Utah, in the Southwestern United States.[1] It grows in soils derived from sandstone.[2]
Description
Encelia resinifera is a shrub ranging in height from Script error: No such module "convert".. The trunk, which becomes fissured with age, supports slender stems.[2]
The leaves, which range between 10 and 25 mm in length, are ovate or lanceolate and are usually pointed at the tips.[2]
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.[2]
Subspecies
Two subspecies have been identified:
- Encelia resinifera subsp. resinifera — button brittlebush.[3]
- 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.[2]
Taxonomy
Encelia resinifera was originally described as a variety of Encelia frutescens (Encelia frutescens var. resinosa) by M.E.Jones in 1913.[4] In 1998 it was reclassified as a distinct species by Curtis Clark.[2][5]
References
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- ↑ Biota of North America Program 2014 county distribution map
- ↑ a b c d e f Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ 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
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