Dalea tentaculoides - H.C. Gentry
Gentry's Indigobush
Taxonomic Status: Accepted
Related ITIS Name(s): Dalea tentaculoides H.C. Gentry (TSN 26648)
Unique Identifier: ELEMENT_GLOBAL.2.142353
Element Code: PDFAB1A1K0
Informal Taxonomy: Plants, Vascular - Flowering Plants - Pea Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Fabales Fabaceae Dalea
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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: Dalea tentaculoides
Taxonomic Comments: A distinct, recently described species in a genus of 250-300 species in the warmer parts of the Americas.
Conservation Status
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NatureServe Status

Global Status: G1
Global Status Last Reviewed: 28Oct2013
Global Status Last Changed: 30May1990
Ranking Methodology Used: Ranked by calculator
Rounded Global Status: G1 - Critically Imperiled
Reasons: The historic range of this species includes the Coyote and Baboquivari mountains in Pima County, Arizona. There is one known population in Arizona, located in the Pajarito Mountains of Santa Cruz County, and several sites in Sonora, Mexico. Threats include seasonal flooding, consumption by livestock, watershed degradation due to overgrazing, and trampling by recreationists and livestock
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: In Arizona, ranges in the Pajarito Mountains, Santa Cruz County over approximately 12.6 sq km; historically in Baboquivari Mountains, Arizona. Observed in Sonora, Mexico as recently as 2005.

Area of Occupancy: 3-25 4-km2 grid cells
Area of Occupancy Comments: In Arizona, occupies approximately 3.6 sq km. Area occupied in Mexico is not known.

Number of Occurrences: 1 - 5
Number of Occurrences Comments: 1 known extant population in Arizona (2004). 5-6 element occurences in Mexico based on collection information. In the 2000s, T. R. Van Devender reported locally common at a few sites.

Population Size Comments: About 20-30 plants observed in Arizona population. Unknown what population size is for occurrences in Mexico, although comments by T.R. Van Devender (2000s) report locally common at a couple of sites.

Number of Occurrences with Good Viability/Integrity: Very few (1-3)

Overall Threat Impact: Very high - high
Overall Threat Impact Comments: Threats in Arizona include seasonal flooding, consumption by livestock, watershed degradation due to overgrazing, and trampling by recreationists and livestock (N. D. Rice). In Mexico, threats are not well known, but probably share some of the same threats.

Short-term Trend: Unknown
Short-term Trend Comments: Arizona: In Sycamore Canyon (1981), only one population of over 100 plants found. In 1989, problems with fence maintenance of Goodding Research Natural Area allowed extensive livestock utilization of Sycamore Canyon population (1990). Fence was repaired and the population improved; between 1990 and 1991, population increased from 1291 to 1389 individuals. Study plot, however, showed higher mortality than recruitment, with population dropping from 148 to 118. Despite drop, mortality very low for larger size classes; significant growth of last year's individuals. Hence, number of large individuals nearly quadrupled. Number of inflorescences produced incresed greatly (Malusa et al. 1992). In early 1993, severe flooding occurred. When plot was surveyed in June, 1993, 20-30 individuals observed although many were completely covered by Sand (Falk and Warren 1994).

Species not found in Mendoza Canyon (Gori 1994), although 1965 specimen from that location has detailed locality information.

Specimen of Dalea from Kitt Peak, Quinlan Mountains (Toolin 1986), was determined by TNC in 1990 to not be Dalea tentaculoides. If not D. tentaculoides then what?

Population size varies year to year due to impacts from cattle grazing and flooding (1990). Can rebound rapidly by root sprouting. Plants grow along flood plains along streams, thus are subject to being "scoured out" by seasonal flooding (DBG 1999).

Current status and trend of populations throughout their range in Arizona and Mexico, is unknown. However, T. R. Van Devender (in the 2000s), reported plants to be locally common at a few sites in Mexico.

Long-term Trend: Unknown

Environmental Specificity: Narrow. Specialist or community with key requirements common.
Environmental Specificity Comments: Found along canyon bottoms and possibly hillsides in oak-juniper and Madrean evergreen woodlands in full to partial shade. Common substrate material in Arizona consists of sandy, gravelly loam of rhyolite parent material.

Other NatureServe Conservation Status Information

Distribution
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Global Range: In Arizona, ranges in the Pajarito Mountains, Santa Cruz County over approximately 12.6 sq km; historically in Baboquivari Mountains, Arizona. Observed in Sonora, Mexico as recently as 2005.

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 Santa Cruz (04023)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
15 Rio De La Concepcion (15080200)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: A shrubby perennial that can grow up to about 2 m tall, but is usually shorter. Clusters of rose-purple flowers bloom April-June or September-October. The sepals, floral bracts, and branches bear elongate, tentacle-like glands.
Palustrine Habitat(s): Riparian
Terrestrial Habitat(s): Woodland - Mixed
Habitat Comments: Canyon bottoms on cobble terraces subject to occasional flooding, in sandy, gravelly loam Rhyolite parent material.
Dalea tentaculoides grows in canyons, and is found at elevations ranging from 3600-4600 ft.; associated with oak-juniper woodland (Barneby 1977), and Madrean evergreen woodland. Because it grows along flood plains along streams, plants are subject to being 'scoured out' by seasonal flooding (Rice, no date).

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: 23Jul1989
NatureServe Conservation Status Factors Author: Gardner, P.A., rev. Maybury (1996), rev. A. Olivero (2003), rev. S. Schuetze (2011)
Element Ecology & Life History Author(s): rev. S Schuetze (2011-07-28)

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
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  • Arizona Game and Fish Department. 2001. Dalea tentaculoides. Unpublished abstract compiled and edited by the Heritage Data Management System, Arizona Game and Fish Department, Phoenix, Arizona. 4 pp.

  • Barneby, R.C. 1977. Daleae imagines. Memoirs New York Botanical Garden 27: 1-891.

  • Gentry, H.S. 1950. Studies in the genus Dalea. Madrono 10: 225-250.

  • Gori, D., J. Malasa, P.L. Warren and E.S. Monarqui. 1991. Population studies of sensitive plants of the Huachuca, Patogonia and Atascusa Mountains, Arizona. Submitted to Coronado National Forest in completion of P.O. No. 40-8197-0-0215. The Arizona Nature Conservancy, Tuscon, Arizona.

  • 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.

  • Rice, K. No date. Center for Plant Conservation National Collection Plant Profile: Dalea tentaculoides. Online. Available: http://ridgwaydb.mobot.org/cpcweb/CPC_ViewProfile.asp?CPCNum=1356. Accessed 2003, June 2.

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

  • U.S. Fish and Wildlife Service. 1998. Notice of reclassification of four candidate taxa. Federal Register 63(63):16217-16218.

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