Penstemon rhizomatosus - N. Holmgren
Rhizome Beardtongue
Other English Common Names: Scheel Creek Beardtongue
Other Common Names: Scheel Creek beardtongue
Taxonomic Status: Accepted
Related ITIS Name(s): Penstemon rhizomatosus N. Holmgren (TSN 565386)
Unique Identifier: ELEMENT_GLOBAL.2.161724
Element Code: PDSCR1L7Z0
Informal Taxonomy: Plants, Vascular - Flowering Plants - Figwort Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Scrophulariales Scrophulariaceae Penstemon
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Concept Reference
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Concept Reference: Kartesz, J.T. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. First edition. In: Kartesz, J.T., and C.A. Meacham. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden, Chapel Hill, N.C.
Concept Reference Code: B99KAR01HQUS
Name Used in Concept Reference: Penstemon rhizomatosus
Taxonomic Comments: Holmgren (1998), in first describing Penstemon rhizomatosus, hypothesizes that it may have arisen from an ancestral P. kingii during the last ice age.
Conservation Status
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NatureServe Status

Global Status: G1
Global Status Last Reviewed: 25Aug2009
Global Status Last Changed: 10Dec1998
Rounded Global Status: G1 - Critically Imperiled
Reasons: First described in 1998, this species is currently known only from a very small area; the six known occurrences are all within the central Schell Creek Range in White Pine County, Nevada, on or near the summits of four peaks. Further survey work may locate additional occurrences. The total population is estimated to contain at least 500 individuals, but its exact size is not known. All known occurrences are within the Humboldt-Toiyabe National Forest; two are within a Research Natural Area. Plants occur on steep talus/scree slopes, outcrops, and cliffs, usually of limestone, mostly within the high subalpine zone.
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 Nevada (S1)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Narrowly endemic to the central Schell Creek Range in White Pine County, Nevada, on or near the summits of Cave Mountain, Cleve Creek Baldy, Taft Peak, and South Schell Peak (Holmgren 1998, Morefield 2001).

Area of Occupancy: 3-500 4-km2 grid cells
Area of Occupancy Comments: Using a 2 x 2 km grid, approximately 6 grid cells are occupied.

Number of Occurrences: 1 - 20
Number of Occurrences Comments: Six occurrences are known; more survey work is needed (Morefield 2001). Considered a high priority for rapid field assessment by the Nevada Natural Heritage Program (2003).

Population Size Comments: A total population of "505+ individuals" is estimated (Morefield 2001). The species was described as "locally abundant; locally common" at one site, but few plant counts or descriptions of abundance are available from other sites.

Overall Threat Impact Comments: Threats are largely unknown. One occurrence may be within a grazing allotment, but it is unlikely that grazing is actually impacting the species given the steepness and instability of many of the talus slopes on which it occurs.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Narrowly endemic to the central Schell Creek Range in White Pine County, Nevada, on or near the summits of Cave Mountain, Cleve Creek Baldy, Taft Peak, and South Schell Peak (Holmgren 1998, Morefield 2001).

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 NV

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
NV White Pine (32033)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
16 Spring-Steptoe Valleys (16060008)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: A rhizomatous perennial herb 1-3 dm tall from a deeply buried taproot. Violet tubular flowers 14-18 mm long bloom from late June to early August and set seed in August.
Technical Description: From Holmgren (1998): "Perennial herb, 0.8-2(-2.8) dm tall; stems ascending, arising in clusters from a loosely branched, woody rhizome, which in turn surmounts a thick woody taproot; herbage finely puberulent with short, white hairs (0.05 mm long) on the stems and upper leaf surfaces, the lower leaf surface glabrous; leaves short-petiolate, all cauline, 1.7-3.5 cm long (including the short petiole), 3-6(-7) mm wide, oblanceolate or the upper sometimes lanceolate, gradually tapering to the winged petiole, entire, obtuse apically, the lowermost sometimes spatulate and much smaller; thyrse of 3-5(-7) verticillasters, the cymes 1-2(-3)-flowered, the lowermost bracts leaflike in size and shape, reduced in size upwards, the peduncles and pedicels glandular-pubescent; calyx glandular-pubescent, 3.5-5.5(-6.5) mm long, lanceolate to ovate, the margins entire, narrowly scarious in the lower half, the apex acute, somewhat thickened and flaring outward; corolla 14-18 mm long, gradually expanding from the tubular base to moderately ampliate, the short upper lip projecting, the lower lobes spreading, violet to reddish violet, glandular-pubescent externally, the palate with 2 pale violet to white ridges, glabrous; staminode exserted, slightly dilated apically, glabrous; fertile stamens reaching the orifice or included, the anthers remaining horseshoe-shaped, the cells 0.9- 1.2 mm long, dehiscing only across the confluent apices, usually purple-black, the sutures ciliate-fringed, glabrous on the sides; capsule 6-9 mm long, ovoid; seeds 1.8-2.3 mm long, dull tan, finely pitted, variable in shape depending on the position in the capsule, with angled edges and flat to concave surfaces or rounded on one side; 1n = 8."
Diagnostic Characteristics: Similar to P. kingii in floral and inflorescence characters, but differs in its rhizomatous habit (vs. stems clustered on a woody crown), flat petiolate leaves (vs. usually folded or arched sessile leaves), pubescence of shorter hairs, and high elevation talus habitat (P. kingii occurs on flat or gentle slopes in lower elevation valley sagebrush habitats) (Holmgren 1998). The section of Penstemon to which P. rhizomatosus belongs (section Saccanthera) is distinguished by its horseshoe-shaped anthers that dehisce only across their confluent apices leaving the distal ends of the anther cells undehisced (saccate) (Holmgren 1998). Within the section, P. rhizomatosus belongs to an "Intermountain alliance" of species, distinguished from the rest of the section by the combination of entire leaves, a glabrous staminode, and purple-black anthers (Holmgren 1998). Within this alliance, it is distinguished from several other taxa by its puberulent leaves; P. patricus, P. platyphyllus, P . sepalulus, P. leonardii var. leonardii, and P. leonardii var. higginsii all have glabrous leaves (Holmgren 1998). It is distinguished from P. cusickii (of southwestern Idaho and eastern Oregon) by its glandular-pubescent (vs. glabrous) corolla with violet to purplish-blue (vs. blue) lobes, and its glandular-pubescent (vs. pubescent but not glandular) inflorescence (Holmgren 1998). It differs from P. tiehmii (of Mt. Lewis in the Shoshone Range, Lander County, Nevada) in its oblanceolate, elliptic, or lanceolate leaf blades 3-6(-7) mm wide (vs. ovate to broadly lanceolate leaf blades 7-24 mm wide) and in having shorter hairs on its stems and leaves (hairs 0.05 mm long on stems and upper leaf surfaces with lower leaf surfaces glabrous vs. hairs 1-1.5 mm long on stems and leaves) (Holmgren 1998).
Terrestrial Habitat(s): Alpine, Bare rock/talus/scree, Cliff, Forest - Conifer, Forest/Woodland, Woodland - Conifer
Habitat Comments: Steep, loose talus and scree slopes (sometimes in silty loam soil pockets) and cracks and crevices of outcrops and cliffs. Rock type is usually carbonate (e.g. limestone), rarely quartzite. Found mostly in the subalpine conifer zone in woodlands of bristlecone pine, limber pine, and/or spruce; occasionally in the alpine. 3000-3425 m.
Economic Attributes Not yet assessed
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Management Summary
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Stewardship Overview: Revisting known sites and surveying other suitable habitat in the region would be a reasonable first step; currently, there is little information available regarding population status and threats (if any) at known sites. Given this plant's restriction to subalpine and alpine areas, monitoring for potential climate change impacts might also be beneficial.
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: 25Jul2000
NatureServe Conservation Status Factors Author: Gries, D. (6/99), CAC-NVHP (7/00), rev. K. Gravuer (2009)
Management Information Edition Date: 25Aug2009
Management Information Edition Author: Gravuer, K.

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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  • Carreno, C., J. Bair, and J. Morefield. 1998. April 2-last update. Nevada Rare Plant Workshop 1998 Meeting Notes. Northern Nevada Native Plant Society. Online. Available: www.state.nv.us/nvnhp/notes98.htm. Accessed 1999, June 4.

  • Holmgren, N.H. 1998. Two new species of Penstemon (Scrophulariaceae: sect. Saccanthera) from Nevada, U.S.A. Brittonia 50: 159-164.

  • Holmgren, N.H. 1998. Two new species of Penstemon (Scrophulariaceae: sect. Saccanthera) from Nevada, U.S.A. Brittonia 50: 159-164.

  • Kartesz, J.T. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. First edition. In: Kartesz, J.T., and C.A. Meacham. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden, Chapel Hill, N.C.

  • Morefield, J.D., editor. 2001. Nevada rare plant atlas [with rare plant fact sheets]. Available as a pdf file at: http://heritage.nv.gov/atlas/atlas.html. Compiled by the Nevada Natural Heritage Program, Carson City, for the U.S. Fish and Wildlife Service, Reno, Nevada.

  • Nevada Natural Heritage Program. 1999. February 19-last update. List of sensitive plants. Online. Available: http://www.state.nv.us/nvnhp/sensplnt.htm. Accessed 1999, June 3.

  • Nevada Natural Heritage Program. 2003, 14 May last update. Nevada plant and lichen taxa of high priority for data development. Online. Available: http://heritage.nv.gov/needplnt.htm

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