Flora of North America species comparison

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Eriogonum villiflorum

Eriogonum diatomaceum

dairyflower buckwheat, gray buckwheat, Gray's wild buckwheat

Churchill Narrows buckwheat, Churchill Narrows wild buckwheat
Habit Herbs, matted, not scapose, 0.01–0.05 × 0.1–0.6 dm, villous to silky-tomentose, grayish. Herbs, matted or slightly spreading, scapose, 0.5–2 × 0.5–2.5 dm, tomentose, grayish.
Stems

matted, with persistent leaf bases, up to 1/8 height of plant;

caudex stems matted;

aerial flowering stems spreading to prostrate, slender, solid, not fistulose, (0.05–)0.15–0.5(–0.8) dm, villous to silky-tomentose.

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

caudex stems matted or slightly spreading;

aerial flowering stems scapelike, erect, slender, solid, not fistulose, (0.4–)0.5–1.5(–2) dm, tomentose.
Leaves

basal, fasciculate in terminal tufts;

petiole 0.05–0.1(–1.5) cm, silky-tomentose;

blade narrowly elliptic, 0.3–1 × 0.1–0.2(–0.3) cm, villous to silky-tomentose, margins plane.

sheathing up flowering stem (1.5–)2–4 cm, 1 per node, fasciculate in terminal tufts on stemless caudex branches;

petiole (0.3–)0.5–1.5(–1.8) cm, tomentose;

blade elliptic, (0.5–)0.8–2(–2.3) × (0.3–)0.5–1.2(–1.8) cm, densely grayish-tomentose on both surfaces, margins plane.
Inflorescences

subcapitate or cymose-umbellate, 0.3–0.9 × 0.5–1.2(–2) cm;

branches dichotomous, villous to silky-tomentose;

bracts 4–8, semileaflike, linear-lanceolate to lanceolate, 2–6(–8) × 0.3–0.7(–1) mm.

capitate, 1–1.5 cm wide;

branches absent;

bracts 3–8, elongate-triangular to triangular, scalelike, 1–3 mm, tomentose.
Peduncles

absent or erect, slender, 0.05–0.15 cm, villous to silky-tomentose.

absent.
Involucres

1 per node, campanulate, (3.5–)4–5 × (3.5–)4–5 mm, rigid, tomentose;

teeth 6–8(–13), spreading, 2–3 mm.

5–10 per cluster, turbinate, (2.5–)3–4.5 × 2–3 mm, rigid, tomentose;

teeth 5–7, erect, 0.6–1 mm.
Flowers

3–4.5 mm;

perianth white to rose, pilose;

tepals connate proximal 1/4, monomorphic, oblong to spatulate;

stamens exserted, 3–4 mm;

filaments glabrous proximally.

(1.5–)2.5–3 mm;

perianth creamy white, glabrous;

tepals connate proximal 1/3–1/2, monomorphic, oblong-ovate;

stamens exserted, 3–3.5 mm;

filaments sparsely pilose proximally.
Achenes

light brown, 2.5–3 mm, glabrous.

light brown, 2–2.5 mm, glabrous.

Eriogonum villiflorum

Eriogonum diatomaceum
Phenology Flowering Apr–Jul. Flowering Jun–Sep.
Habitat Gravelly to clayey flats and slopes, sagebrush communities, pinyon-juniper woodlands White, chalky slopes, saltbush communities
Elevation 1500-2400 m (4900-7900 ft) 1300-1400 m (4300-4600 ft)
Distribution
from FNA
NV; UT
[WildflowerSearch map]
[BONAP county map]
from FNA
NV
[BONAP county map]
Discussion

Eriogonum villiflorum is probably more common than now documented, the plants being inconspicuous and easily overlooked. It is known from Eureka, Lincoln, northeastern Nye, and White Pine counties in eastern Nevada, and from Beaver, Iron, Juab, Kane, Millard, Sanpete, and Tooele counties in western Utah. The Kane County type location is questionable, as it is well outside the known range of the species today. The sprawling flowering stems with large clusters of involucres and flowers are distinctive. The species is occasionally encountered in cultivation as a rock-garden plant.

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

Of conservation concern.

Eriogonum diatomaceum is known only from a few scattered populations in the Churchill Narrows area south of Fort Churchill State Park in Lyon County, occurring on silty diatomaceous deposits of the Coal Valley Formation. It is considered a “sensitive” species in Nevada, and is also a candidate for federal endangered listing, U.S. Fish and Wildlife Service.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 5, p. 285. FNA vol. 5, p. 276.
Parent taxa Polygonaceae > subfam. Eriogonoideae > Eriogonum > subg. Eucycla Polygonaceae > subfam. Eriogonoideae > Eriogonum > subg. Eucycla
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. 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. 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. 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. visheri, E. watsonii, E. wetherillii, E. wootonii, E. wrightii, E. zionis
Name authority A. Gray: Proc. Amer. Acad. Arts 8: 630. (1873) Reveal: Novon 12: 87, fig. 1. (2002)
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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