Encelia resinifera

Taxobox
name = "Encelia resinifera"

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image_width = 240px
regnum = Plantae
divisio = Magnoliophyta
classis = Magnoliopsida
ordo = Asterales
familia = Asteraceae
genus = "Encelia"
species = "E. resinifera"
binomial = "Encelia resinifera"
binomial_authority = C.Clark
synonyms="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.

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.cite web|url=http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250066500|title="Encelia resinifera" C. Clark|work=Flora of North America database|publisher=efloras.org |accessdate=2008-01-18]

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.

Two subspecies have been identified, as follows:
*"E. resinifera" subsp. "resinifera" - button brittlebushcite web|url=http://plants.usda.gov/java/profile?symbol=ENRE|title="Encelia resinifera" C. Clark|work=PLANTS database|publisher=United States Department of Agriculture|accessdate=2008-01-18]
*"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.

Distribution

The species is found at elevations between 1100 and 1700 metres in the states of Arizona and Utah in soils derived from sandstone.

References