The California Deserts: Plant Life at the Extremes
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1 The California Deserts: Plant Life at the Extremes Red Pass, Death Valley NP Naomi S. Fraga Rancho Santa Ana Botanic Garden
2 Eastern Kern County, California Western Mojave Desert
3 29 million acres (45,000 sq mi), or 28% of California's landmass. GIS layer source: Omernick ecoregions level 3 Great Basin Mojave Sonoran
4 A Conspiracy of Extremes - Topography: 14,246 to -279 ft. - Geology: Limestone, granite, sand dunes - Temperature: below freezing to 134 F (1913) - Changing history over the past 12,000 years - Transition to modern desert complete by 8,500 to 5,000 years ago Bruce Pavlick The California Deserts Krascheninnikovia lanata (winterfat)
5 Water, water, water...there is no shortage of water in the desert but exactly the right amount, a perfect ratio of water to rock, water to sand, insuring that wide free open, generous spacing among plants and animals, homes and towns and cities, which makes the arid West so different from any other part of the nation. There is no lack of water here unless you try to establish a city where no city should be. Edward Abbey, Desert Solitaire: A Season in the Wilderness Dutch Cleanser Mine, Red Rock Canyon SP
6 Desert Flora taxa native to desert (37% of the CA flora) taxa that do not occur elsewhere in CA (33%) naturalized taxa (9%) when compared CA (17%) Sources Desert Jepson Manual (2002) Jepson e-flora (2017) Pavlick (2008) Hesperocallis undulata (desert lily)
7 Topographic diversity= species diversity Great Basin 1363 Taxa Mojave 1409 Taxa Sonoran 709 Taxa
8 Remarkable Flora Dr. Frank Vasek s students circling King Clone on April 1, Photo by Dr. Vasek - ca. 11,700 years old!
9 Plants From Space! - ca. 11,700 years old!
10 Exceptional Flora - Ancient bristlecone pines >5,000 years old! Photo: Chris de Rham
11 Long lived and slow to heal - Coleogyne ramosissima (black brush) >1,200 years - Eriogonum fasciculatum (California buckwheat) >700 years - Thamnosma montana (turpentine broom) >1,100 years Longevity, recruitment, and mortality of desert plants. Bowers et al Slow motion population dynamics in Mojave Desert perennial plants. Cody 2000 Thamnosma montana
12 Life forms Annual 44.0% Perennial herb 24.0% Shrubs 12.0% Subshrub Geophyte Trees 4.0% 3.0% 5.5% Succulents 1.6% Owens Peak eastern watershed flora Fraga (2008)
13 Rare Plants - 642/2377 rare plant (27%) - None presumed extinct - 2 taxa extirpated from the state Holmgrenanthe petrophila (rock lady) Titus Canyon, DVNP
14 Rare Plants Rare plants by ranking B 2B 4 3 Enceliopsis covillei (Panamint daisy) Wildrose Canyon, DVNP
15 Short Canyon, Kern County Phacelia nashiana (Charlotte s phacelia) CNPS 1B.2
16 Eureka Dunes, Inyo County Oenothera californica subsp. eurekensis CNPS 1B.2l; FE
17 Carson Slough, Inyo County Nitrophila mohavensis (Amargosa niterwort) CNPS 1B.1; FE, CE
18 Rare Plants Red Rock Canyon SP, Kern County Erythranthe rhodopetra (Red Rock Canyon monkeyflower) CNPS 1B.1
19 Threats - increase fire frequency - changes in fire regime Sawtooth Complex Fire 2006
20 Threats Rattlesnake Canyon grazing allotment
21 Threats New Dixie Mine Road, Flamingo Heights
22 Threats Jawbone Canyon OHV area and Industrial Solar
23 Invasive species weed species - Poaceae 75 taxa, or 33% of the total non-native plant diversity. - Asteraceae (sunflowers; 25) - Brassicaceae (mustards; 24) - Chenopodiaceae (goosefoot family, 12). - Documentation - Early detection - Control and Eradication - Research
24 Tamarix in Amargosa River Canyon (salt cedar; Tamaricaceae)
25 Native or Not? Imperata brevifolia (California satintail; Poaceae)
26 Bromus berteroanus (B. trinii) (Chilean chess; Poaceae) Florets of B. berteroanus Photo by Jose Hernandez (USDA Plants) - Attributed as native in Distribution of Native Grasses of California (Beetle 1947) - Jepson Manual 2012 listed as native, e-flora listed as naturalized - Andy Sanders at UCR. Once widespread now more restricted to Mojave Desert where competition is less intense.
27 Portulaca oleracea subsp. impolita Photo by Keir Morse (verdolagas, purslane; Portulacaceae)
28 Mollugo cerviana (threadstem carpetweed; Mollugaceae)
29 Desert Explorers Mary Dedecker Edmund Jaeger Bruce Pavlick Jim Andre Chuckwalla Mountains Photo by Duncan Bell Mary Dedecker CNPS Bristlecone chapter.
30 The desert is complete; it is spare and alone, but perfect in its solitude. -Kiersten White Bighorn Mountain Wilderness, San Bernardino County
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