December 2012 Number 1 - Utah Native Plant Society

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Utah Native Plant Society Table 1. Statistical Summary of the Flora of Cedar Breaks National Monument* Category Taxonomic Diversity Species & Varieties Full Species Only No. of Taxa Confirmed Present No. of Taxa Reported (not confirmed) Total 347 7 354 335 5 340 Families 56 0 56 Biogeographic Diversity Introduced 17 1 18 Native 330 6 336 Locally Endemic Regionally Endemic 18 0 18 20 0 20 Disjunct 2 0 2 Peripheral 0 0 0 Sparse 6 0 6 Widespread 284 6 290 The number of taxa and plant families is based on Welsh and others (2008). Biogeographic diversity categories refer to the distribution of a species within Utah and the state’s contribution to its overall global range (Fertig 2009b). Introduced taxa are not native to Utah or North America but have become naturalized (breeding on their own without human assistance). Local Endemics have their entire global range restricted to an area of less than 16,500 square km (ca 6370 sq miles, or 1 degree of latitude x 2 degrees of longitude). Regional Endemics have global ranges of 16,500-250,000 square km (an area about the size of Wyoming). Disjuncts are isolated from the contiguous portion of their range by a gap of more than 800 km (ca 500 miles). Peripherals are widespread globally but occur at the margin of their contiguous range in Utah and occupy less than 5% of the state’s area (usually only within a few miles of the state border). Sparse taxa occur widely across Utah or North America but their range within Utah is small and patchy, with populations restricted to specialized or uncommon habitats. Widespread taxa have global ranges exceeding 250,000 square km and occur over at least 10% of the state. * See Addendum for additional species documented since 2009. Breaks National Monument are presently listed as sensitive by the US Forest Service or BLM and 14 were once candidates for listing as Threatened or Endangered under the US Endangered Species Act (Table 2). During 2007-2008 we targeted 16 of Cedar Breaks’ rarest local endemics and CDC species of concern (Table 2) for survey. The number of target species increased to 18 with the discovery of extant populations of Madsen’s daisy and the first records of Welsh’s aster (Aster welshii) for the monument. We recorded at least one population of 16 of the target species at 546 different sampling points within Cedar Breaks National Monument or the Ashdown Gorge Wilderness Area. Since more than one target species was often present at each location, we actually documented 1181 different sample points for these species. For the clonal species Salix arizonica we delineated 16 discrete polygons in three main population clusters that cover a total area of just over one hectare (Fertig and Reynolds 2009). Ten of our target species occurred in over 10% of our samples. These species were found mostly on the red or white limey-sandstone layers of the Claron Formation along the rim and slopes of the Cedar Breaks Amphitheater. Cedar Breaks wild buckwheat (Eriogonum panguicense var. alpestre) was the most widespread and abundant of the rare species, being found in 36% of all samples and having a population estimated at 35,200- 100,000 individuals (Fertig and Reynolds 2009). This plant also has the smallest geographic range of any taxon in our study, being known only from the Cedar Breaks area within the monument and the adjacent Dixie National Forest and Ashdown Gorge Wilderness. Only three other species were estimated to have populations of over 10,000 plants: Least lomatium (Lomatium minimum), Markagunt aster (Aster wasatchensis var. wasatchensis), and Least spring-parsley (Cymopterus minimus). The least abundant and most restricted species in the study area were Rosy cliff jamesia (known from only about 100 plants in two main areas; Madsen’s daisy (approximately 400 plants in three main areas), Reveal’s paintbrush (Castilleja parvula var. revealii with 500 plants in two main populations), Podunk groundsel (Senecio malmstenii with about 1500 individuals in five sites), and Welsh’s aster (with an estimated 1700 plants scattered along Ashdown and Rattle creeks in the bottom of the amphitheater). We were unsuccessful in relocating just one of the 18 target species, the Zion draba (Draba asprella var. zionensis). This species is known from a single herbarium specimen (Dickman s.n. CEBR) collected from “Cedar Breaks National Monument” in 1977. Unfortunately, nothing more precise is known about the original collection site. Zion draba occurs commonly in Zion National Park on Navajo Sandstone cliffs and canyons. Comparable Navajo Sandstone outcrops are not exposed at Cedar 38
Calochortiana December 2012 Number 1 Table 2. Vascular Plant Species of Concern of Cedar Breaks National Monument Family Apiaceae (Umbelliferae) Apiaceae (Umbelliferae) Asteraceae (Compositae) Asteraceae (Compositae) Asteraceae (Compositae) Asteraceae (Compositae) Asteraceae (Compositae) Asteraceae (Compositae) Asteraceae (Compositae) Asteraceae (Compositae) Asteraceae (Compositae) Asteraceae (Compositae) Brassicaceae (Cruciferae) Species/ Common Name Cymopterus minimus Least spring-parsley Lomatium minimum Least lomatium Agoseris glauca var. agrestis* Field agoseris Antennaria pulcherrima* Showy pussytoes Aster wasatchensis var. wasatchensis Markagunt aster Aster welshii Welsh’s aster Erigeron sionis var. trilobatus Cedar Breaks daisy Erigeron vagus var. madsenii Madsen’s daisy Haplopappus zionis Cedar Breaks goldenbush Machaeranthera commixta* Bigelow’s aster Senecio malmstenii Podunk groundsel Townsendia montana var. minima Bryce Canyon townsendia Draba asprella var. zionensis Zion draba TNC Rank Legal & UTCDC Status G1G2Q/ S1S2 G3/S3 USFS: Sensitive USFWS: former C2 UTCDC: Rare USFWS: former 3C UTCDC: Watch G5T5/S1S2 UTCDC: Taxonomic Problems G5?/S1 Abundance in CEBR Ca 12,500 plants, in 35% of sample plots Ca 33,600 plants, in 13.2% of sample plots Not known UTCDC: Peripheral Not known G2/S2 UTCDC: Watch Ca 15,100 plants in 17.8% of sample plots G2/S2 UTCDC: Watch Ca 1700 plants in 4.6% of sample plots G2/S2 USFWS: former C2 UTCDC: Watch Ca 4200 plants in 13.6% of sample plots G4T?/SNR Ca 4000 plants in 2% of sample plots G2/S2 G4G5T3?/ S3? G1/S1? G4T3/S3 UT BLM: Sensitive USFWS: former C2 UTCDC: Watch UTCDC: Watch USFS: Sensitive USFWS: former C2 UTCDC: Rare USFWS: former C2 UTCDC: Watch G4T3?/S3? USFWS: former 3C UTCDC: Watch Ca 4100 plants in 14.3% of sample plots Not known Ca 1500 plants in 4% of sample plots Ca 4100 plants in 11% of sample plots Not known, may be falsely reported Brassicaceae (Cruciferae) Draba subalpina Breaks draba G3/S3 USFWS: former 3C UTCDC: Watch Ca 8700 plants in 22% of sample plots Brassicaceae (Cruciferae) Caryophyllaceae Equisetaceae Physaria rubicundula var. rubicundula* Breaks bladderpod Silene petersonii Peterson’s campion Equisetum variegatum* Northern scouring-rush G3//S3 USFWS: former 3C UTCDC: Watch G2G3/S2S3 USFS: Sensitive; USFWS: former C2 UTCDC: Watch G5/S1 Not known Ca 2900 plants in 12.1% of plots UTCDC: Peripheral Not known 39
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Pot Score Min Score Trend Threat In
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December 2012 Number 1 - Utah Native Plant Society

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