Eriogonum bicolor

M. E. Jones

Zoë 4: 281. 1893.

Common names: Pretty wild buckwheat
Endemic
Synonyms: Eriogonum microthecum subsp. bicolor (M. E. Jones) S. Stokes
Treatment appears in FNA Volume 5. Treatment on page 253. Mentioned on page 231, 240.

Subshrubs, compact, not scapose, 0.2–0.8 × 0.5–2 (–3) dm, reddish or tannish-tomentose, reddish. Stems erect to slightly spreading, often with persistent leaf-bases, up to 1/4 height of plant; caudex stems compact; aerial flowering-stems spreading to somewhat erect, slender, solid, not fistulose, 0.05–0.2 dm, tomentose. Leaves cauline, 1 per node or fasciculate; petiole 0.1–0.2 cm, tomentose to floccose; blade linear-oblanceolate to narrowly elliptic, 0.5–1.7 (–2) × 0.1–0.2 (–0.3) cm, densely white-tomentose abaxially, slightly less so and often reddish or tannish adaxially, margins revolute. Inflorescences umbellate to cymose, compact, rarely reduced to single involucre, 0.5–1 × 0.5–1.5 cm; branches dichotomous, tomentose; bracts 3, scalelike, linear, 0.7–1.3 mm. Peduncles erect, 0.1–0.3 (–0.4) cm, tomentose to floccose. Involucres 1 per node, turbinate-campanulate, 2–4 × 1.5–3 mm, tomentose to floccose or glabrous; teeth 5, erect, 0.4–0.7 mm. Flowers 2.5–4 (–4.5) mm; perianth white, glabrous; tepals connate proximal 1/4, dimorphic, those of outer whorl broadly obovate to nearly orbiculate, (2–) 2.5–3 mm wide, those of inner whorl oblanceolate to narrowly elliptic, 1–1.5 mm wide; stamens long-exserted, 3–5 mm; filaments sparsely pilose proximally or glabrous. Achenes light-brown, 3–3.5 mm, glabrous.


Phenology: Flowering Apr–Jul.
Habitat: Silty, sandy, or heavy clay washes, flats, and slopes, saltbush and blackbrush communities, juniper or pinyon-juniper woodlands
Elevation: 1300-2000(-2300) m

Discussion

Eriogonum bicolor is common from Castle Valley and the San Rafael Swells of Carbon and Emery counties, Utah, eastward to Grand Valley of Grand County, Utah, and Mesa County, Colorado. It occurs to the south in Garfield, San Juan, Sevier, and Wayne counties of Utah, especially in Canyonlands National Park and the Grand Staircase-Escalante National Monument. The species is worthy of cultivation, although being a slow-growing perennial of rather specialized soils it is a challenge. Seed germination in garden plots is reasonably successful; transplanting is difficult.

Selected References

None.

Lower Taxa

None.

"/2" is not declared as a valid unit of measurement for this property."dm" is not declared as a valid unit of measurement for this property."dm" is not declared as a valid unit of measurement for this property."dm" is not declared as a valid unit of measurement for this property.

... more about "Eriogonum bicolor"
light-brown +
included +  and exserted +
3-gonous +
usually red +  and cream or yellow +
oblong +  and ellipsoid or oval +
James L. Reveal +
M. E. Jones +
deciduous +  and persistent +
stipelike +
Undefined subg. Eucycla +
papillate +
awn-tipped +  and simple +
1.7 cm17 mm <br />0.017 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
tannish +  and reddish +
0.5 cm5 mm <br />0.005 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
white-tomentose +
linear-oblanceolate;narrowly elliptic +
0.1cm;0.2cm +
not awn-tipped +
leaflike +  and semileaflike +
glandular +, pubescent +  and glabrous +
scale-like +
not brittle +
spreading +  and erect +
scabrellous +
ridged +, angled +  and round +
spreading +  and erect +
whorled +, opposite +  and alternate +
Pretty wild buckwheat +
Colo. +  and Utah. +
1300-2000(-2300) m +
glabrous +  and pilose +
0.4 cm4 mm <br />0.004 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
unisexual +, , +  and bisexual +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
decumbent to erect +  and prostrate +
not fistulose +
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 +
Silty, sandy, or heavy clay washes, flats, and slopes, saltbush and blackbrush communities, juniper or pinyon-juniper woodlands +
reduced +
umbellate +  and cymose +
capitate +  and subcapitate +
dense +  and diffuse +
cymelike +, paniclelike +, racemelike +  and spikelike +
connate +  and free +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
tomentose +  and floccose or glabrous +
turbinate-campanulate +
nonmembranous +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
in whorls +, opposite +, alternate +  and rosulate +
persistent +
bractlike +
pubescent +  and glabrous +
lobed +, undulate +, crisped +, crenulate +  and entire +
not swollen +
orthotropous +
accrescent +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
curved +  and straight +
tomentose;floccose +
erect to deflexed +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
cylindric +  and urceolate +
accrescent +
fleshy +, indurate +  and membranous +
with extrafloral nectaries +  and not articulate +
tomentose +  and floccose +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Flowering Apr–Jul. +
homostylous +  and 3-carpellate +
, +  and solid +
slender;stout +
persistent +
long-exserted +
decumbent to erect +  and prostrate +
erect +  and slightly spreading +
penicillate +, fimbriate +  and capitate +
deciduous +  and persistent +
? (?) +  and ? (?) +
coriaceous +  and membranous +
consisting of a series +  and tubular +
distinct +
erect;spreading or recurved +
Eriogonum microthecum subsp. bicolor +
chambered +  and solid +
Slender (?) +  and Stout (?) +
Eriogonum bicolor +
Eriogonum subg. Eucycla +
species +
emarginate +  and entire +
in proximal 1/2 +  and connate +
0 +  and 1/2 +
lobed +  and laciniate +
coriaceous +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
persistent +
membranous +
pubescent +  and glabrous +
tannish-tomentose +
synoecious +, monocarpic +, polycarpic +  and , +
3 +, 2 +  and 1 +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +