Eriogonum cedrorum - Reveal & Raiche
The Cedars Buckwheat
Taxonomic Status: Provisionally accepted
Unique Identifier: ELEMENT_GLOBAL.2.836576
Element Code: PDPGN087A0
Informal Taxonomy: Plants, Vascular - Flowering Plants - Buckwheat Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Polygonales Polygonaceae Eriogonum
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Concept Reference
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Concept Reference: Reveal, J. L. and R. Raiche. 2009. Eriogonum cedrorum (Polygonaceae: Eriogonoideae), a new species from northwestern California. Journal of the Botanical Research Institute of Texas 3(2): 479-483.
Concept Reference Code: A09REV01HQUS
Name Used in Concept Reference: Eriogonum cedrorum
Taxonomic Comments: First described in 2009 from Sonoma County, California, Eriogonum cedrorum differs from E. nervulosum in having bright yellow flowers that are on shorter stipes but associated with longer involucres (Reveal and Raiche 2009).
Conservation Status
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NatureServe Status

Global Status: G1
Global Status Last Reviewed: 26May2015
Global Status Last Changed: 10Mar2010
Rounded Global Status: G1 - Critically Imperiled
Reasons: Newly described in 2009, Eriogonum cedrorum is a localized endemic known only from serpentine talus slopes and rock crevices within The Cedars area of Sonoma County, California. Plants occur in roughly three distinct areas within The Cedars, and a total of 1500-2000 individuals are known. The population appears stable in at least one of the three known areas.
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 California (S1)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: A localized endemic known only from The Cedars area of Sonoma Co., California. The Cedars consists of an isolated block of ultramafic mantle rock (Harzburgite) and its derived soils; the area experiences a hot dry summer more typical of the interior California climates well to the east (Reveal and Raiche 2009).

Number of Occurrences: 1 - 5
Number of Occurrences Comments: Plants are described as occurring in "roughly three zones" [(1) the northwest part of The Cedars in upper Danfield Creek, (2) the central upper canyons of Big Austin Creek, (3) the east side near Red Slide above East Austin Creek] (Reveal and Raiche 2009). Four distinct collections have been made (Reveal and Raiche 2009).

Population Size Comments: 1500-2000 plants are known (Reveal and Raiche 2009).

Short-term Trend Comments: A recent survey of the Central Canyon sites showed the population to be stable (Reveal and Raiche 2009).

Other NatureServe Conservation Status Information

Distribution
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Global Range: A localized endemic known only from The Cedars area of Sonoma Co., California. The Cedars consists of an isolated block of ultramafic mantle rock (Harzburgite) and its derived soils; the area experiences a hot dry summer more typical of the interior California climates well to the east (Reveal and Raiche 2009).

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

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
CA Sonoma (06097)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
18 Gualala-Salmon (18010109)+, Russian (18010110)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Technical Description: From Reveal and Raiche (2009): "Plants low spreading synoecious herbaceous perennials, 1-4(-10) dm long, 1-3(-5) dm across, composed of loosely arranged rosettes of tufted leaves at tips of slender, woody caudex branches arising from a stout woody taproot. Leaves tightly arranged in small, more or less well defined basal rosettes; petiole 0.3-0.8(-1 .1) cm long, densely tannish-white tomentose, arising from a narrowly elongate triangular petiole base, 2-3.5 mm long, 1.5-2 mm wide, tomentose and minutely villous abaxially, glabrous and tannish adaxially; blade broadly elliptic to ovate, 0.7-1.5 cm long, 0.4-1 cm wide, tannish-white lanate abaxially, thinly tomentose to glabrate or glabrous and greenish to light olive-green adaxially especially with age, with a broadly obtuse to rounded base not tapering to the petiole, an entire, plane margin, and a mostly obtuse to broadly obtuse apex; midvein slightly raised, obscured by tomentum. Aerial flowering stems erect to slightly spreading, 2-8 cm long, villous, bractless. Inflorescences compound umbellate, slightly open, mostly 1-2 cm long, 1-3 cm across; branches villous, grayish to greenish white, not drying blackish; bracts 4-6 at base of inflorescence, spreading, sessile or nearly so with elliptic blades, 4-10 mm long, (1.5-)2-4 mm wide, usually white tomentose abaxially, thinly tomentose and slightly greenish adaxially; centrally positioned peduncle 5-10mm long, villous; lateral branches 3-8 mm long, these terminated by a whorl of 4-6 linear to narrowly oblanceolate bracts, 2-8 mm long, 0.7-1.2 mm wide; peduncles atop lateral branches 2-5(-7) mm long, villous. Involucres solitary, broadly turbinate, 4-6.5 mm long, 3.5-5.5(-6) mm wide, densely villous abaxially, glabrous adaxially: teeth 6-8, erect, acute (when long) to obtuse or even rounded apically, 0.3-0.6(-1) mm long. Pedicels erect to slightly curved with age, 4-6.5 mm long, glabrous: bractlets linear, 4-6(-6.5) mm long, densely villous. Flowers bright yellow at early anthesis, rapidly becoming fused with red and ultimately red to reddish maroon with an undertone of yellow, 2-3 mm long when yellow becoming 4.5-6 mm at maturity on a 0.1-0.3 mm long stipe, glabrous; tepals monomorphic, obovate; stamens slightly exserted, with 2-4 mm long, slightly pilose basally filaments, and oval, yellow, 0.4-0.6 mm long anthers; pistil with styles 1-1.3(-1.5) mm long. Achenes light yellowish brown, narrowly trigonous, 4.5-6 mm long, glabrous; embryo straight."
Diagnostic Characteristics: From Reveal and Raiche (2009): "Eriogonum cedrorum belongs to a subgroup of subgenus Oligogonum Nutt that is characterized by an involucre with erect teeth and smallish leaves arranged into rosettes that result is low, spreading mats. Within the subfamily, E. cedrorum may be distinguished by a whorl of bracts immediately below the inflorescence, glabrous flowers on short stipes that are initially yellow but rapidly change to a red or reddish-maroon, a synoecious habit, villous involucres, and leaf-blades that are lanate abaxially.

Based on the yellow flower color, E. cedrorum is allied to E. ternatum, but that species differs in its compact mat of densely arranged rosettes of leaves terminated by long (10-30 cm long) flowering stems that bear an umbellate inflorescence with sulphur-yellow flowers that remain distinctly yellow even at maturity.

Eriogonum cedrorum differs from the more closely allied E. nervulosum of nearby Colusa, Glenn, and Lake counties, California, by its yellow (not white) flowers, and while both quickly become reddish, the yellow and white undertone is retained in each species. Both of these species occur on serpentine but E. nervulosum tends to be more compact than E. cedrorum. Both species have relatively short aerial flowering stems and similar leaves, but they differ in lengths of their involucres (4-6.5 mm in E. cedrorum versus 3-4 mm in E. nervulosum) and in the length of their stipes (0.1-0.3 mm versus 0.5-0.8 mm, respectively). Also individual plants of E. cedrorum tend be larger than those of E. nervulosum, but this may be the result of the loose talus slopes where E. cedrorum is found rather than any significant genetically-fixed morphological difference. Both species differ from E. ternatum in having compound umbellate inflorescences, with that of E. cedrorum more open (and thus more obviously branched) than that of E. nervulosum, which often appears to be subumbellate."

Terrestrial Habitat(s): Bare rock/talus/scree, Barrens
Habitat Comments: The Cedars area is dominated by Sargent cypress (Hesperocyparis sargentii) woodland and chaparral, within which Eriogonum cedrorum appears restricted to extremely steep canyon slopes that are mostly open rock and talus forming extensive serpentine barrens. Most of the plants grow in loose gravelly talus, although a smaller number find bare rock crevices suitable; however, those on the talus are typically larger mats. While slopes with N-facing aspect account for the majority of the plants, some are on E-, S- and W-facing slopes. The reason why it this species does not occur in nearby, apparently similar habitat is as yet unclear. 365-550 m (Reveal and Raiche 2009).
Associated species include Asclepias solanoana, Aspidotis densa, Cardamine californica var. sinuata, Epilobium minutum, Eriogonum luteolum, Eriogonum nudum var. auriculatum, Hesperolinon spergulinum, Minuartia douglasii, Phacelia corymbosa, Sairocarpus vexillocalyculatus, Streptanthus morrisonii, and Streptanthus barbiger. Allium falcifolium, Eriophyllum lanatum, and Eschscholzia caespitosa are more restricted to certain sites. An undescribed Holodiscus taxon is the only hard-woody plant to occur within populations, but Arctostaphylos bakeri ssp. sublaevis and Arctostaphylos viscida ssp. pulchella may occur peripherally (Reveal and Raiche 2009).

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: 10Mar2010
NatureServe Conservation Status Factors 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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  • Reveal, J. L. and R. Raiche. 2009. Eriogonum cedrorum (Polygonaceae: Eriogonoideae), a new species from northwestern California. Journal of the Botanical Research Institute of Texas 3(2): 479-483.

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