Amoreuxia gonzalezii - Sprague & Riley
Santa Rita Yellowshow
Taxonomic Status: Accepted
Related ITIS Name(s): Amoreuxia gonzalezii Sprague & Riley (TSN 22253)
Unique Identifier: ELEMENT_GLOBAL.2.142932
Element Code: PDBIX01010
Informal Taxonomy: Plants, Vascular - Flowering Plants - Other flowering plants
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Violales Bixaceae Amoreuxia
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Concept Reference
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Concept Reference: Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Concept Reference Code: B94KAR01HQUS
Name Used in Concept Reference: Amoreuxia gonzalezii
Taxonomic Comments: A distinct species in a small American genus of 7 species.
Conservation Status
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NatureServe Status

Global Status: G1
Global Status Last Reviewed: 21Oct2013
Global Status Last Changed: 11Aug1999
Ranking Methodology Used: Ranked by calculator
Rounded Global Status: G1 - Critically Imperiled
Reasons: Known with certainty only from northern Mexico and extending north to 2 locations in southern Arizona. Threatened by herbivory as this species is very palatable to cattle (AGFD 1995, 2011). Other threats include the aggressive spread of non-native grass species, including buffelgrass (Cenchrus ciliaris) and Lehmans lovegrass (Eragrostis lehmanniana); which has been widely planted as a forage grass for cattle.
Nation: United States
National Status: N1

U.S. & Canada State/Province Status
Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
United States Arizona (S1)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Southern Arizona and northern Mexico. Ranges over 81 sq km in Santa Rita Mountains, Santa Cruz County. Historically occurred in the Baboquivari Mountains in Pima County, Arizona. Also occurs south into Sonora, Mexico and probably Baja California.

Area of Occupancy: 26-2,500 4-km2 grid cells
Area of Occupancy Comments: Occupies about 81 sq km in Arizona (Santa Rita Mountains). Occupied area in Mexico is unknown.

Number of Occurrences: 1 - 5
Number of Occurrences Comments: Two known populations in Arizona, including the Santa Rita Mountains and Baboquivari Mountains; the Baboquivari occurrence has not been seen since it was first collected in 1981. Also known from 4 populations in northern Mexico (according to Arizona ranking form 1/99).

Population Size Comments: Santa Rita Mtns population consists of four to five micro populations or one megapopulation of less than 65 plants. Baboquivari population size and trend unknown; not seen since first collected in 1981 by LJ Toolin.

Abundance in populations influenced by rainfall (Ariz. ranking form).

Number of Occurrences with Good Viability/Integrity: Unknown

Overall Threat Impact: High
Overall Threat Impact Comments: The foreseeable threat with the greatest impact is alien species. This includes introduction and spread of exotic grasses including buffelgrass (Cenchrus ciliaris), Lehmans lovegrass (Eragrostis lehmanniana), and other aggressive, exotic plants (AGFD 1995, 2011). Herbivory by cattle is the biggest management problem as this species is highly palatable to cattle (AGFD 1995, 2011). Degradation of habitat due to livestock grazing is also a threat (AGFD 1995, 2011). Amoreuxia gonzalezii may also be threatened by Javelina rooting up roots, development and mining (N. D. Rice; AGFD 1995). With so few populations and individuals, stochastic and naturally occurring events are also threats to A. gonzalezii.

Short-term Trend: Unknown
Short-term Trend Comments: Santa Rita Mtns population consists of four to five micro populations or one mega population of less than 65 plants; occurs from a single limestone outcrop, but the trend is unknown. Size and trend of the Thomas Canyon population on the east side of the Baboquivari Mountains is unknown. This population has not been seen since it was first collected in 1981 by Toolin 1705 and Turner (ARIZ), area of old Riggs Ranch in Thomas Canyon, woodland/grassland, at elevations of 4200-4500 ft., T19S, R7E.

Sonoran populations trend and size unknown except for Mazocahui-Moctezuma population revisited a few months after first seen in 1988, much fewer plants seen and with few fruit.

Long-term Trend: Unknown

Environmental Specificity: Narrow. Specialist or community with key requirements common.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Southern Arizona and northern Mexico. Ranges over 81 sq km in Santa Rita Mountains, Santa Cruz County. Historically occurred in the Baboquivari Mountains in Pima County, Arizona. Also occurs south into Sonora, Mexico and probably Baja California.

U.S. States and Canadian Provinces

Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
Color legend for Distribution Map

U.S. & Canada State/Province Distribution
United States AZ

Range Map
No map available.

National Distribution Outside of U.S. & Canada: Mexico

U.S. Distribution by County Help
State County Name (FIPS Code)
AZ Pima (04019), Santa Cruz (04023)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
15 Upper Santa Cruz (15050301)+, Brawley Wash (15050304)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: A perennial herb with short flowering stems (2.5-3.5 dm tall) from a large tuber-like root. Produces salmon-orange colored flowers (July-September) and large ellipsoidal fruit.
Reproduction Comments: Low reproductivity in plants (Desert Botanical Garden 1999).
Terrestrial Habitat(s): Bare rock/talus/scree, Desert, Grassland/herbaceous
Habitat Comments: Upper Sonoran desertscrub/grassland transition zone. In Arizona, occurs on limestone hills and talus slopes at 1280-1370 m in the Santa Rita Mountains. In Mexico, occurs on granite at about 460 m.
Economic Attributes Not yet assessed
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Management Summary Not yet assessed
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Population/Occurrence Delineation Not yet assessed
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Population/Occurrence Viability
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U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
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Authors/Contributors
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NatureServe Conservation Status Factors Edition Date: 01Aug1989
NatureServe Conservation Status Factors Author: Gardner, P.A., rev. Maybury (1996), rev. A. Olivero (2003), S. Schuetze (2011)

Botanical data developed by NatureServe and its network of natural heritage programs (see Local Programs), The North Carolina Botanical Garden, and other contributors and cooperators (see Sources).

References
Help
  • Arizona Game and Fish Department. 1995. Amoreuxia gonzalezii. Unpublished abstract compiled and edited by the Heritage Data Management System, Arizona Game and Fish Department, Phoenix, Arizona. 3 pp.

  • Desert Botanical Garden. 1999. Amoreuxia gonzalezii. Online: www.dbg.org/Collections/amoureauxia_gonzalesii.html.

  • Hodgson, W.C. 1989. A tale of two saiyas: conserving plant lore and gene pools. Agave 3(3)

  • Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.

  • Kearney, T.H., R.H. Peebles, and collaborators. 1951. Arizona flora. 2nd edition with Supplement (1960) by J.T. Howell, E. McClintock, and collaborators. Univ. California Press, Berkeley. 1085 pp.

  • Nabhan, G.P., E. Saucedo Monarque, P. Olwell, P. Warren, W. Hodgson, C. Gallindo-Duarte, R. Bittman, and S. Anderson. 1989. Plants at risk in the Sonoran Desert: an international concern. Introduction and a preliminary list. Agave 3(3): 14-15.

  • Rice, K.C. No date. Center for Plant Conservation National Collection Plant Profile: Amoreuxia gonzalezii. Online. Available: http://ridgwaydb.mobot.org/cpcweb/CPC_ViewProfile.asp?CPCNum=4459. Accessed 2003, April 15.

  • Rutman, S. 1992. Handbook of Arizona's endangered, threatened, and candidate plants. U.S. Fish and Wildlife Service, Phoenix, Arizona.

  • Shreve, F., and I.L. Wiggins. 1964. Vegetation and flora of the Sonoran Desert. 2 volumes. Stanford Univ. Press, Stanford. 1740 pp.

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