CPC National Collection Plant Profile
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Agave schottii var. treleasei
Family: |
Agavaceae |
Common Names: |
Trelease agave, Trelease shindagger |
Author: |
(Toumey) Kearney & Peebles |
Growth Habit: |
Subshrub, Shrub, Forb/herb |
CPC
Number: |
50 |
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Primary
custodian for this plant in the CPC National Collection of Endangered
Plants is: |
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Kathleen C. Rice contributed to this Plant Profile. |
Agave schottii var. treleasei
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Members of the Agave genus occur natively in arid and tropical regions from the southern USA to northern South America, and throughout the Caribbean (Benson and Darrow 1981, Gentry 1986). More than 200 species are recognized. The name Agave is derived from the Greek and means "noble," referring to their tall flower stalk. Some agave species have stalks that grow up to 40 feet tall. Agaves in general have many common and native local names including maguey, mescal, lechuguilla, amole and century plant.
Several species in the genus Agave are of global economic importance. Agave sisalana and Agave fourcroydes are widely cultivated in Africa, Asia, Mexico and Central America for fiber. The most important economic use of agaves is production of mescal and tequila. These products are worth millions of dollars to the Mexican economy. In Mexico, thousands of hectares are devoted to plantations of Agave tequilana, the source of tequila. Other species are grown world-wide as ornamentals (Desert Botanic Garden 2002)
Agave schotti v. treleasii is succulent rosette-forming perennial plant with leaves that are 25 to 40 cm long, 12 to 25 mm wide, linear, and deep green with no bud imprinting. Flowers appear from May to July. The flower stalk is 2 to 4 meters tall and 2.6 to 3.3 cm in diameter (Gentry 1986). It is subspicate to narrowly racemose-paniculate, the longer branchlets 27 to 40 mm long, the shorter ones 0.7 to 2.2 mm long (Benson and Darrow 1981, Gentry 1986). The deep yellow flowers are 35 to 50 mm long, usually 2 per cluster (Benson and Darrow 1981, Gentry 1986).
Distribution
& Occurrence |
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State Range
Habitat
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This species occurs at elevations from 1100-2000 meters on sunny, open, gentle rocky slopes or in small drainages in high desert scrub, grassland and juniper and oak woodlands on gneiss substrate. (Desert Botanic Garden 2002). |
Distribution
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Agave schottii var. treleasei is a narrow endemic found only in Pima and Cochise counties in southeastern Arizona. (Desert Botanic Garden 2002). |
Number Left
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There is only a single occurrence of Agave schottii v. treleasii in habitat, located in the Santa Catalina Mountains (Phillips and Hodgeson 1991). This variety may be a polyploid of A. schottii v. schottii. Another possibility that is more likely is that plants here are hybrids between A. schottii. v. schottii and A. chrysantha or A. palmeri.
(see Notes) |
State/Area
Protection
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State/Area |
Rank |
Status |
Date |
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Arizona |
S1 |
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8/1/2002 |
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Conservation,
Ecology & Research |
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Ecological
Relationships
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Like most species in the Agave genus, this species likely has its flowers pollinated by bats and/or hawk moths (Phillips and Comus 2000). |
Threats
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The primary threat to Agave schottii v. treleasii is its inherent rarity (USFWS 1976). |
Current Research Summary
Current Management Summary
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Management focus is on avoiding direct impacts. The Santa Catalina site is located in the Pursch Ridge Wilderness Area, on U.S. Forest Service land (Phillips and Hodgson 1991). |
Research Management Needs
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Taxonomic clarification is needed, and additional surveys are also needed. Chromosomal studies on plants from both sites (see notes) are needed, along with further electrophoretic work. |
Ex Situ Needs
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Books (Single Authors)
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Benson, L.; Darrow, R.A. 1981. Trees and Shrubs of the Southwest Deserts. Tucson, AZ: University of Arizona Press. 68p.
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Gentry, H.S. 1982. Agaves of continental North America. Tucson, AZ: Univ. Arizona Press.
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Kartesz, J.T. 1993. Species distribution data for vascular plants of 70 geographical areas, from unpublished data files at the North Carolina Botanical Garden.
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Kartesz, J.T. 1996. Species distribution data at state and province level for vascular plant taxa of the United States, Canada, and Greenland (accepted records), from unpublished data files at the North Carolina Botanical Garden.
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Kearney, T.H.; Peebles, R.H. 1973. Arizona flora. Berkeley, CA: University of California Press. 1085p.
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Phillips, S.J.; Comus, P.W. 2000. A Natural History of the Sonoran Desert. Tucson, AZ: Arizona-Sonoran Desert Museum Press.
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Books (Sections)
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Kartesz, J.T. 1999. A synonymized checklist of the vascular flora of the U.S., Canada, and Greenland. In: Kartesz, J.T.; Meacham, C.A., editors. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden. Chapel Hill, NC.
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Electronic Sources
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(2000). Center for Plant Conservation's National Living Collection--Profiles. Desert Botanical Garden. http://www.dbg.org/Collections/cpc.html. Accessed: 2002.
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Arizona Game and Fish Department. (1999). Plant Abstracts. Compiled and edited by the Heritage Data Management System, Arizona Game and Fish Department, Phoenix, AZ. http://www.gf.state.az.us/frames/fishwild/hdms_site/Abstracts/Plants/abstracts%20-%20plants.htm. Accessed: 2002.
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Journal Articles
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Trame, A.M.; Coddington, A.J.; Paige, K.N. 1995. Field and Genetic-Studies Testing Optimal Outcrossing in Agave schottii, a Long-Lived Clonal Plant. Oecologia. 104, 1: 93-100.
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USFWS. 1976. Proposed Endangered Status for 1700 U.S. Plants. Federal Register. 41: 24523-24572.
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Reports
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Fonseca, J.; Scalero, D. 1999. Determining Valuable Species within Pima County, AZ: a discussion paper for the Sonoran desert conservation plan. Tuscon, AZ: Pima County Flood Control District.
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Phillips, A.M., III; Hodgson, W.C. 1991. Status Report. Phoenix, Arizona: Prepared for the U.S. Fish and Wildlife Service, Ecological services.
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This
profile was updated on 3/4/2010 |
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