Eriogonum arcuatum var. arcuatum

Common names: Baker’s wild buckwheat
Endemic
Synonyms: Eriogonum bakeri Greene Eriogonum flavum var. tectum S. Watson Eriogonum jamesii subsp. bakeri (Greene) S. Stokes Eriogonum jamesii subsp. flavescens (S. Watson) S. Stokes Eriogonum jamesii var. flavescens S. L. Welsh Eriogonum jamesii var. higginsii
Treatment appears in FNA Volume 5. Treatment on page 369. Mentioned on page 370.

Plants spreading, compact mats, (1–) 2–3 (–6) dm wide. Aerial flowering-stems (0.3–) 0.5–2 dm. Leaf-blades oblanceolate to elliptic, (0.5–) 1–3 × 0.5–1.5 cm. Inflorescences umbellate or compound-umbellate, branched 1–3 times, rarely capitate; bracts (0.3–) 0.5–2 × (0.3–) 0.4–1 cm. Involucres 3–7 × (3–) 4–8 mm. Flowers (4–) 5–8 mm.


Phenology: Flowering Jun–Oct.
Habitat: Sandy, clayey, gravelly, or rocky flats, slopes and outcrops, ledges and cliffs, mixed grassland, saltbush, creosote bush, blackbrush, and sagebrush communities, pinyon, juniper, or conifer woodlands
Elevation: 1000-3000 m

Distribution

V5 758-distribution-map.gif

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

Discussion

Variety arcuatum is widely distributed and occasionally common from southeastern Wyoming south in central and western Colorado, eastern Utah, northern Arizona, and northwest New Mexico. Some specimens of var. arcuatum gathered in southeastern Wyoming can be difficult to distinguish from Eriogonum flavum. Plants with capitate inflorescences, sometimes recognized as var. higginsii, occur throughout the range of the variety. If such distinction is to be made, the earliest available epithet is tectum.

Selected References

None.

Lower Taxa

None.

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light-brown;brown +
included +  and exserted +
3-gonous +
usually red +  and cream or yellow +
oblong +  and ellipsoid or oval +
James L. Reveal +
Greene +
deciduous +  and persistent +
stipelike +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
awn-tipped +  and simple +
greenish +  and grayish +
0.5 cm5 mm <br />0.005 m <br /> (3 cm30 mm <br />0.03 m <br />) +
floccose +  and tomentose +
oblong;elliptic +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
not awn-tipped +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
glandular +, pubescent +  and glabrous +
scale-like +
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
grooved +, disarticulating +  and dichotomous +
not brittle +
scabrellous +
spreading +  and erect +
whorled +, opposite +  and alternate +
Baker’s wild buckwheat +
Ariz. +, Colo. +, N.Mex. +, Utah +  and Wyo. +
1000-3000 m +
curved +  and straight +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
unisexual +  and bisexual +
attenuate +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 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 +
Sandy, clayey, gravelly, or rocky flats, slopes and outcrops, ledges and cliffs, mixed grassland, saltbush, creosote bush, blackbrush, and sagebrush communities, pinyon, juniper, or conifer woodlands +
branched +, compound-umbellate +  and umbellate +
1-3 times rarely capitate +
cymelike +, paniclelike +, racemelike +  and spikelike +
connate +  and free +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
campanulate +
nonmembranous +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
oblanceolate +  and elliptic +
0.5cm;1.5cm +
in whorls +, opposite +, alternate +  and rosulate +
persistent +
bractlike +
pubescent +  and glabrous +
not swollen +
orthotropous +
accrescent +
curved +  and straight +
erect to deflexed +
cylindric +  and urceolate +
accrescent +
fleshy +, indurate +  and membranous +
with extrafloral nectaries +  and not articulate +
tomentose +  and floccose +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Flowering Jun–Oct. +
homostylous +  and 3-carpellate +
, +  and solid +
slender;stout +
persistent +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
decumbent to erect +  and prostrate +
prostrate +  and erect +
glandular +, pubescent +  and glabrous +
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 bakeri +, Eriogonum flavum var. tectum +, Eriogonum jamesii subsp. bakeri +, Eriogonum jamesii subsp. flavescens +, Eriogonum jamesii var. flavescens +  and Eriogonum jamesii var. higginsii +
chambered +  and solid +
slender +  and stout +
Eriogonum arcuatum var. arcuatum +
Eriogonum arcuatum +
variety +
emarginate +  and entire +
1/4 +  and 1/3 +
lobed +  and laciniate +
coriaceous +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
persistent +
membranous +
pubescent +  and glabrous +
sericeous +, lanate +  and tomentose floccose or glabrous +
dioecious +, polygamodioecious +, synoecious +  and polycarpic +
annual +, biennial +  and perennial +
synoecious +, monocarpic +, polycarpic +  and , +
3 +, 2 +  and 1 +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +