Flora of North America species comparison

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Eriogonum saxatile

Eriogonum visheri

hoary buckwheat, hoary wild buckwheat, rock buckwheat

Visher's buckwheat, Visher's wild buckwheat
Habit Herbs, loosely to densely matted, not scapose, (1–)2–4 × 0.5–2 dm, densely white- or grayish-lanate to tomentose or floccose. Herbs, erect to spreading, annual, (1–)1.5–3.5(–4) dm, sparsely villous, grayish.
Stems

spreading, often with persistent leaf bases, up to 1/4 height of plant;

caudex stems matted, decumbent to spreading;

aerial flowering stems spreading to erect, slender, solid, not fistulose, 0.5–1.5 dm, lanate to tomentose or floccose.

caudex absent;

aerial flowering stems erect, solid, not fistulose, 0.3–0.8(–1) dm, sparsely villous.
Leaves

basal or sheathing up stems 4 cm, 1 per node or fasciculate at tips of caudex branches;

proximal leaves: petiole 1–3(–4) cm, tomentose, blade obovate to rounded, 1–2(–2.5) × 1–2 cm, lanate to tomentose;

distal leaves sessile, blade elliptic to rounded, 0.3–1 × 0.3–1 cm, lanate to tomentose.

basal and cauline;

basal: petiole 1–3 cm, villous to pilose, blade elliptic to rotund, (0.8–)1–2.5 × (0.6–)1–2.5 cm, glabrous and green on both surfaces, margins entire, villous;

cauline: petiole 0.5–1.5 cm, sparsely villous, blade elliptic, 0.5–1.5 × 0.5–1 cm, similar to basal blade.
Inflorescences

cymose, 10–25 × 5–12 cm;

branches dichotomous, lanate to tomentose or floccose;

bracts 3–4, scalelike, triangular, 1.5–7 mm.

cymose, open, 5–35 × 5–35 cm;

branches sparsely villous;

bracts 3, scalelike, 1–2.5(–3) × 1–2.5 mm.
Peduncles

absent.

absent except in fork of proximal node, erect, straight, slender, 0.3–1(–1.5) cm, sparsely villous.
Involucres

1 per node, turbinate, 3–4 × 2–3 mm, tomentose to floccose;

teeth 5–6, erect, 0.8–1.5 mm.

turbinate, 1–1.5(–2) × 0.8–1.5 mm, glabrous;

teeth 5, erect, 0.3–0.6(–0.8) mm.
Flowers

(3–)5–7 mm, including elongate, sharply triangular, slightly winged, stipelike base;

perianth white to rose or yellowish, glabrous;

tepals connate proximally, dimorphic, those of outer whorl oblanceolate to lanceolate, 3–5 × 1.5–2 mm, those of inner whorl obovate, 4–6 × 2–3 mm;

stamens included to slightly exserted, 2.5–5 mm;

filaments pilose proximally.

(1.2–)1.5–2.5 mm;

perianth yellowish with darker yellow to greenish yellow or reddish brown midribs, sparsely hispid;

tepals monomorphic, oblanceolate to oblong;

stamens exserted, 1.2–1.7(–2) mm;

filaments glabrous.
Achenes

3-gonous, nearly winged, 3.5–4 mm, glabrous.

shiny dark brown, 3-gonous, (2–)2.5–3 mm, glabrous.
2n

= 40.

Eriogonum saxatile

Eriogonum visheri
Phenology Flowering May–Oct. Flowering Jun–Aug.
Habitat Decomposed granitic or volcanic flats, slopes, and ridges, chaparral, saltbush, and sagebrush communities, pinyon-juniper and montane conifer woodlands Loamy to clayey flats and outcrops, mixed grassland and saltbush communities
Elevation (300-)800-3400(-3500) m ((1000-)2600-11200(-11500) ft) 500-900 m (1600-3000 ft)
Distribution
from FNA
CA; NV
[WildflowerSearch map]
[BONAP county map]
from FNA
MT; ND; SD
[BONAP county map]
Discussion

Eriogonum saxatile is found mainly in arid mountains of California (Fresno, Inyo, Kern, Los Angeles, Mono, Monterey, Riverside, San Benito, San Bernardino, Santa Barbara, Tulare, and Ventura counties) and Nevada (Esmeralda and western Nye counties). The plants vary considerably as to robustness, degree of branching, and sprawl of the caudex. The size and position of the leaves also vary, as does the density of tomentum on the blades. Flower color varies from white to rose or yellowish, but the deep yellow of E. crocatum is never seen in E. saxatile. The species is frequently cultivated and is an excellent plant for the rock garden.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Eriogonum visheri is rare to infrequent throughout its range. It appears to be concentrated in two areas, one primarily in the “badlands” of western South Dakota and a second from the Cheyenne River northward to just north of the Cannonball River area in south-central North Dakota. It occurs also in Carter County, Montana. In South Dakota, the species is protected on the Buffalo Gap National Grassland, and is considered “sensitive” by the U.S. Forest Service. It is in the Center for Plant Conservation’s National Collection of Endangered Plants.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 5, p. 324. FNA vol. 5, p. 391.
Parent taxa Polygonaceae > subfam. Eriogonoideae > Eriogonum > subg. Eucycla Polygonaceae > subfam. Eriogonoideae > Eriogonum > subg. Ganysma
Sibling taxa
E. abertianum, E. acaule, E. alatum, E. aliquantum, E. allenii, E. alpinum, E. ammophilum, E. ampullaceum, E. androsaceum, E. anemophilum, E. angulosum, E. annuum, E. apiculatum, E. apricum, E. arborescens, E. arcuatum, E. aretioides, E. argillosum, E. argophyllum, E. arizonicum, E. artificis, E. atrorubens, E. baileyi, E. batemanii, E. bicolor, E. bifurcatum, E. brachyanthum, E. brachypodum, E. brandegeei, E. breedlovei, E. brevicaule, E. butterworthianum, E. caespitosum, E. capillare, E. cernuum, E. chrysops, E. cinereum, E. cithariforme, E. clavatum, E. clavellatum, E. codium, E. collinum, E. coloradense, E. compositum, E. concinnum, E. congdonii, E. contiguum, E. contortum, E. correllii, E. corymbosum, E. covilleanum, E. crocatum, E. cronquistii, E. crosbyae, E. cusickii, E. darrovii, E. dasyanthemum, E. davidsonii, E. deflexum, E. deserticola, E. desertorum, E. diatomaceum, E. diclinum, E. divaricatum, E. douglasii, E. eastwoodianum, E. effusum, E. elatum, E. elegans, E. elongatum, E. ephedroides, E. eremicola, E. eremicum, E. ericifolium, E. esmeraldense, E. evanidum, E. exaltatum, E. exilifolium, E. fasciculatum, E. flavum, E. fusiforme, E. giganteum, E. gilmanii, E. glandulosum, E. gordonii, E. gossypinum, E. gracile, E. gracilipes, E. gracillimum, E. grande, E. greggii, E. gypsophilum, E. havardii, E. heermannii, E. helichrysoides, E. hemipterum, E. heracleoides, E. hieracifolium, E. hirtellum, E. hirtiflorum, E. hoffmannii, E. holmgrenii, E. hookeri, E. howellianum, E. hylophilum, E. incanum, E. inerme, E. inflatum, E. intrafractum, E. jamesii, E. jonesii, E. kelloggii, E. kennedyi, E. kingii, E. lachnogynum, E. lancifolium, E. latens, E. latifolium, E. lemmonii, E. leptocladon, E. leptophyllum, E. libertini, E. lobbii, E. loganum, E. lonchophyllum, E. longifolium, E. luteolum, E. maculatum, E. mancum, E. marifolium, E. mensicola, E. microthecum, E. mitophyllum, E. mohavense, E. molestum, E. mortonianum, E. multiflorum, E. natum, E. nealleyi, E. nervulosum, E. nidularium, E. niveum, E. nortonii, E. novonudum, E. nudum, E. nummulare, E. nutans, E. ochrocephalum, E. ordii, E. ostlundii, E. ovalifolium, E. palmerianum, E. panamintense, E. panguicense, E. parishii, E. parvifolium, E. pauciflorum, E. pelinophilum, E. pendulum, E. pharnaceoides, E. plumatella, E. polycladon, E. polypodum, E. prattenianum, E. prociduum, E. pulchrum, E. pusillum, E. pyrolifolium, E. racemosum, E. reniforme, E. ripleyi, E. rixfordii, E. robustum, E. rosense, E. roseum, E. rotundifolium, E. rubricaule, E. rupinum, E. salicornioides, E. scabrellum, E. scopulorum, E. shockleyi, E. siskiyouense, E. smithii, E. soliceps, E. soredium, E. spathulatum, E. spectabile, E. spergulinum, E. sphaerocephalum, E. strictum, E. subreniforme, E. suffruticosum, E. temblorense, E. tenellum, E. ternatum, E. terrenatum, E. thomasii, E. thompsoniae, E. thornei, E. thurberi, E. thymoides, E. tiehmii, E. tomentosum, E. trichopes, E. tripodum, E. truncatum, E. tumulosum, E. twisselmannii, E. umbellatum, E. ursinum, E. vestitum, E. villiflorum, E. vimineum, E. viridescens, E. viridulum, E. viscidulum, E. visheri, E. watsonii, E. wetherillii, E. wootonii, E. wrightii, E. zionis
E. abertianum, E. acaule, E. alatum, E. aliquantum, E. allenii, E. alpinum, E. ammophilum, E. ampullaceum, E. androsaceum, E. anemophilum, E. angulosum, E. annuum, E. apiculatum, E. apricum, E. arborescens, E. arcuatum, E. aretioides, E. argillosum, E. argophyllum, E. arizonicum, E. artificis, E. atrorubens, E. baileyi, E. batemanii, E. bicolor, E. bifurcatum, E. brachyanthum, E. brachypodum, E. brandegeei, E. breedlovei, E. brevicaule, E. butterworthianum, E. caespitosum, E. capillare, E. cernuum, E. chrysops, E. cinereum, E. cithariforme, E. clavatum, E. clavellatum, E. codium, E. collinum, E. coloradense, E. compositum, E. concinnum, E. congdonii, E. contiguum, E. contortum, E. correllii, E. corymbosum, E. covilleanum, E. crocatum, E. cronquistii, E. crosbyae, E. cusickii, E. darrovii, E. dasyanthemum, E. davidsonii, E. deflexum, E. deserticola, E. desertorum, E. diatomaceum, E. diclinum, E. divaricatum, E. douglasii, E. eastwoodianum, E. effusum, E. elatum, E. elegans, E. elongatum, E. ephedroides, E. eremicola, E. eremicum, E. ericifolium, E. esmeraldense, E. evanidum, E. exaltatum, E. exilifolium, E. fasciculatum, E. flavum, E. fusiforme, E. giganteum, E. gilmanii, E. glandulosum, E. gordonii, E. gossypinum, E. gracile, E. gracilipes, E. gracillimum, E. grande, E. greggii, E. gypsophilum, E. havardii, E. heermannii, E. helichrysoides, E. hemipterum, E. heracleoides, E. hieracifolium, E. hirtellum, E. hirtiflorum, E. hoffmannii, E. holmgrenii, E. hookeri, E. howellianum, E. hylophilum, E. incanum, E. inerme, E. inflatum, E. intrafractum, E. jamesii, E. jonesii, E. kelloggii, E. kennedyi, E. kingii, E. lachnogynum, E. lancifolium, E. latens, E. latifolium, E. lemmonii, E. leptocladon, E. leptophyllum, E. libertini, E. lobbii, E. loganum, E. lonchophyllum, E. longifolium, E. luteolum, E. maculatum, E. mancum, E. marifolium, E. mensicola, E. microthecum, E. mitophyllum, E. mohavense, E. molestum, E. mortonianum, E. multiflorum, E. natum, E. nealleyi, E. nervulosum, E. nidularium, E. niveum, E. nortonii, E. novonudum, E. nudum, E. nummulare, E. nutans, E. ochrocephalum, E. ordii, E. ostlundii, E. ovalifolium, E. palmerianum, E. panamintense, E. panguicense, E. parishii, E. parvifolium, E. pauciflorum, E. pelinophilum, E. pendulum, E. pharnaceoides, E. plumatella, E. polycladon, E. polypodum, E. prattenianum, E. prociduum, E. pulchrum, E. pusillum, E. pyrolifolium, E. racemosum, E. reniforme, E. ripleyi, E. rixfordii, E. robustum, E. rosense, E. roseum, E. rotundifolium, E. rubricaule, E. rupinum, E. salicornioides, E. saxatile, E. scabrellum, E. scopulorum, E. shockleyi, E. siskiyouense, E. smithii, E. soliceps, E. soredium, E. spathulatum, E. spectabile, E. spergulinum, E. sphaerocephalum, E. strictum, E. subreniforme, E. suffruticosum, E. temblorense, E. tenellum, E. ternatum, E. terrenatum, E. thomasii, E. thompsoniae, E. thornei, E. thurberi, E. thymoides, E. tiehmii, E. tomentosum, E. trichopes, E. tripodum, E. truncatum, E. tumulosum, E. twisselmannii, E. umbellatum, E. ursinum, E. vestitum, E. villiflorum, E. vimineum, E. viridescens, E. viridulum, E. viscidulum, E. watsonii, E. wetherillii, E. wootonii, E. wrightii, E. zionis
Synonyms E. saxatile subsp. multicaule
Name authority S. Watson: Proc. Amer. Acad. Arts 12: 267. (1877) A. Nelson: Bot. Gaz. 56: 64. (1913)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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