Eriogonum wetherillii

Eastwood

Proc. Calif. Acad. Sci., ser. 2, 6: 319. 1896.

Common names: Wetherill’s wild buckwheat
Endemic
Synonyms: Eriogonum filiforme L. O. Williams Eriogonum sessile S. Stokes ex M. E. Jones
Treatment appears in FNA Volume 5. Treatment on page 405. Mentioned on page 385, 406.

Herbs, spreading, annual, 0.5–2.5 dm, glabrous, reddish green to reddish. Stems: caudex absent; aerial flowering-stems erect, solid, not fistulose, 0.1–0.4 dm, glabrous except somewhat villous proximally. Leaves basal; petiole 1–5 cm, tomentose to floccose; blade oblong to orbiculate, (0.5–) 1–4 × (0.5–) 1–3 cm, densely white-tomentose abaxially, floccose to glabrate and reddish or greenish adaxially, margins plane. Inflorescences cymose, diffuse, flat-topped to rounded, 5–20 × 10–35 cm; branches glabrous; bracts 3, scalelike, 0.5–2 × 1–2 mm. Peduncles erect, straight, filiform, (0.3–) 0.5–1 cm, glabrous, rarely absent distally. Involucres turbinate, (0.3–) 0.5–1 × (0.2–) 0.5–1 mm, glabrous; teeth 4, erect, 0.1–0.3 mm. Flowers 0.5–1.2 mm in early anthesis, becoming 1–1.5 mm; perianth yellowish to red in early anthesis, becoming pink to rose, glabrous; tepals monomorphic, elliptic to obovate; stamens included to slightly exserted, 0.7–1 mm; filaments glabrous. Achenes dark-brown to black, lenticular, 0.6–1 mm, glabrous.


Phenology: Flowering Apr–Oct.
Habitat: Sandy to clayey flats, washes, and slopes, saltbush, greasewood, blackbrush, and creosote bush communities, oak and pinyon and/or juniper woodlands
Elevation: 1000-2100(-2700) m

Distribution

V5 838-distribution-map.gif

Ariz., Colo., N.Mex., Utah.

Discussion

Eriogonum wetherillii is a species of the Colorado Plateau in northern Arizona (Apache, Coconino, and Navajo counties), southwestern Colorado (Montezuma County), northwestern New Mexico (San Juan County), and southeastern Utah (Emery, Garfield, Grand, Kane, San Juan, eastern Sevier, and Wayne counties). It typically is locally common, especially on sandy soils, but only rarely weedy.

Selected References

None.

Lower Taxa

None.

"dm" is not declared as a valid unit of measurement for this property.

... more about "Eriogonum wetherillii"
dark-brown;black +
included +  and exserted +
lenticular +
usually red +  and cream or yellow +
oblong +  and ellipsoid or oval +
James L. Reveal +
Eastwood +
deciduous +  and persistent +
stipelike +
Eriogonum sect. Ganysma +
awn-tipped +  and simple +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
greenish +  and reddish +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
floccose +  and glabrate +
oblong;orbiculate +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
not awn-tipped +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
glandular +, pubescent +  and glabrous +
scale-like +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
grooved +, disarticulating +  and dichotomous +
not brittle +
scabrellous +
ridged +, angled +  and round +
spreading +  and erect +
whorled +, opposite +  and alternate +
Wetherill’s wild buckwheat +
Ariz. +, Colo. +, N.Mex. +  and Utah. +
1000-2100(-2700) m +
unisexual +, , +  and bisexual +
not attenuate +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
decumbent to erect +  and prostrate +
not fistulose +
slender;stout +
unwinged +  and winged +
black +, red +, brown +  and yellowish +
exserted +  and included +
pubescent +  and glabrous +
spheroidal +, 4-gonous +, lenticular +, biconvex +, discoid +, 3-gonous +  and 2-gonous +
Sandy to clayey flats, washes, and slopes, saltbush, greasewood, blackbrush, and creosote bush communities, oak and pinyon and/or juniper woodlands +
capitate +  and subcapitate +
racemose +, paniculate +  and cymose-paniculate +
5 cm50 mm <br />0.05 m <br /> (20 cm200 mm <br />0.2 m <br />) +
flat-topped +  and rounded +
10 cm100 mm <br />0.1 m <br /> (35 cm350 mm <br />0.35 m <br />) +
connate +  and free +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
nonmembranous +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
in whorls +, opposite +, alternate +  and rosulate +
marcescent +
persistent +
bractlike +
pubescent +  and glabrous +
not swollen +
orthotropous +
accrescent +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
erect to deflexed +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
cylindric +  and urceolate +
accrescent +
fleshy +, indurate +  and membranous +
with extrafloral nectaries +  and not articulate +
tomentose +  and floccose +
1 cm10 mm <br />0.01 m <br /> (5 cm50 mm <br />0.05 m <br />) +
Flowering Apr–Oct. +
homostylous +  and 3-carpellate +
Proc. Calif. Acad. Sci., ser. +
, +  and solid +
slender;stout +
persistent +
included +  and slightly exserted +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
decumbent to erect +  and prostrate +
spreading +  and erect +
glabrous +, short-hispid +, villous +, hirsute +, floccose +  and tomentose +
penicillate +, fimbriate +  and capitate +
deciduous +  and persistent +
2-lobed +  and cylindric +
coriaceous +  and membranous +
consisting of a series +  and tubular +
distinct +
erect;spreading or recurved +
spreading;erect +
Eriogonum filiforme +  and Eriogonum sessile +
chambered +  and solid +
slender +  and stout +
Eriogonum wetherillii +
Eriogonum subg. Ganysma +
species +
emarginate +  and entire +
1/5 +  and 1/2 +
elliptic +  and obovate +
coriaceous +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
persistent +
membranous +
pubescent +  and glabrous +
annual +  and perennial +
reddish green +  and reddish +
synoecious +, monocarpic +, polycarpic +  and , +
3 +, 2 +  and 1 +