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cottony buckwheat, cottony wild buckwheat, gypsum wild-buckwheat

Eastwood's buckwheat, Eastwood's wild buckwheat

Habit Herbs, spreading, annual, 0.5–2 dm, tomentose, grayish to reddish. Herbs, erect, 2–5 dm, tomentose, greenish gray to gray.
Stems

caudex absent;

aerial flowering stems erect, not striated or angled, solid, not fistulose, 0.2–0.5 dm, tomentose.

aerial flowering stems erect, (0.4–)0.8–1.5 dm, tomentose.

Leaves

basal and cauline;

basal: petiole 0.5–1 cm, floccose, blade broadly oblanceolate, 1.5–4 × 0.5–1 cm, tomentose abaxially, floccose or glabrate and grayish to green adaxially, margins crenulate, often slightly revolute;

cauline sessile, blade lanceolate, 0.3–2 × 0.2–0.7 cm, similar to basal blade.

basal;

petiole 2–8 cm, tomentose;

blade suborbiculate, 1–3 × 1–3 cm, white-tomentose abaxially, subglabrous and greenish adaxially.

Inflorescences

cymose, diffuse, 3–17 × 5–25 cm;

branches tomentose;

bracts 3, scalelike, 1–2 × 0.5–1.5 mm.

cymose, open, 10–40 × 10–40 cm;

branches tomentose;

bracts 1–5(–6) × 1–2 mm.

Peduncles

spreading, straight, capillary, 0.2–1.5 cm, thinly tomentose to floccose or glabrous.

erect, straight, slender, 1–3.5 cm, tomentose.

Involucres

turbinate, 2.7–3 × 2–2.5 mm, glandular-puberulent, densely tomentose adaxially;

teeth 5, spreading, 0.8–1.2(–1.5).

terminal at tips of slender branchlets at least proximally, not appressed to branches, turbinate, 2–2.5 × 1.5–2 mm, tomentose;

teeth 5, erect, 0.6–0.9 mm.

Flowers

1.5–1.7 mm;

perianth white, glandular-puberulent;

tepals monomorphic, narrowly oblong;

stamens included, 1–1.5 mm;

filaments pilose proximally.

1.5–2.5(–3) mm;

perianth white, glabrous;

tepals monomorphic, elliptic to oblong-obovate;

stamens included, 0.7–1.2 mm;

filaments usually pilose proximally;

styles 0.1–0.3 mm.

Achenes

light brown, 3-gonous, 1.3–1.5 mm, glabrous.

brownish, 3-gonous, 1.6–2(–2.5) mm;

beak granular.

2n

= 40.

= 34.

Eriogonum gossypinum

Eriogonum eastwoodianum

Phenology Flowering year-round. Flowering May–Sep.
Habitat Clayey gypsophilous flats and slopes, grassland and saltbush communities Sandy shale outcrops and slopes, mixed grassland communities, oak and pine woodlands
Elevation 100-500 m (300-1600 ft) (200-)500-1000 m ((700-)1600-3300 ft)
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[BONAP county map]
Discussion

Eriogonum gossypinum is rare to infrequent on the foothills of the Inner Coast Ranges in Kings (Kettleman Hills) and eastern San Luis Obispo counties, with two centers of concentration in Kern County, one in the Taft area and another east of Bakersfield. The Kern County populations are the most extensive and subject to the greatest habitat destruction. The species is protected at The Nature Conservancy’s Sand Ridge Preserve near Edison.

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

Eriogonum eastwoodianum is rare and known only from two disjunct locations in Fresno County, one in the Silver Creek Canyon area and the other above Jacalitos Ranch on Parkfield Grade. Plants from a third site in the Cottonwood Pass area of San Luis Obispo County are now assigned to E. temblorense. That species and E. vestitum are closely related to E. eastwoodianum, and only fully mature plants can be assigned unquestionably to one of those species.

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

Source FNA vol. 5, p. 413. FNA vol. 5, p. 417.
Parent taxa Polygonaceae > subfam. Eriogonoideae > Eriogonum > subg. Ganysma Polygonaceae > subfam. Eriogonoideae > Eriogonum > subg. Oregonium
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. 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
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. 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
Synonyms E. covilleanum subsp. adsurgens, E. truncatum var. adsurgens, E. vimineum subsp. adsurgens
Name authority Curran: Bull. Calif. Acad. Sci. 1: 274. (1885) J. T. Howell: Leafl. W. Bot. 2: 133. (1938)
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