Eriogonum brevicaule var. laxifolium

(Torrey & A. Gray) Reveal

Great Basin Naturalist 27: 220. 1968.

Common names: Loose-leaf wild buckwheat
Endemic
Basionym: Eriogonum kingii var. laxifolium Torrey & A. Gray Proc. Amer. Acad. Arts 8: 165. 1870
Synonyms: Eriogonum brevicaule var. huberi S. L. Welsh Eriogonum brevicaule var. promiscuum S. L. Welsh Eriogonum brevicaule var. pumilum S. Stokes ex M. E. Jones Eriogonum chrysocephalum Eriogonum medium
Treatment appears in FNA Volume 5. Treatment on page 266. Mentioned on page 260, 264, 265, 267, 269.

Plants mostly erect, 1–3.5 × 1–5 dm. Aerial flowering-stems erect or nearly so, scapelike or dichotomous, (0.7–) 1–2.5 dm, tomentose to floccose. Leaves: blade linear to narrowly oblanceolate, (1.5–) 3–9 (–12) × 0.1–0.5 (–0.7) cm, tomentose abaxially, less so and grayish or occasionally greenish adaxially, margins plane or more often revolute. Inflorescences umbellate or cymose divided 1–3 times and 2–5 (–8) cm, or capitate and 1–2 cm; branches tomentose to floccose. Involucres 1 per node or more commonly 3–7 per cluster, turbinate to turbinate-campanulate, (2–) 2.5–4 × 1.5–3 mm, usually tomentose, occasionally thinly floccose or glabrous. Flowers (2–) 3–3.5 (–4) mm; perianth yellow or ochroleucous, glabrous.


Phenology: Flowering Jun–Sep.
Habitat: Sandy to clayey flats, washes and slopes, mixed grassland, sagebrush, and mountain mahogany communities, juniper, oak and montane conifer woodlands
Elevation: 1400-2800 m

Discussion

Variety laxifolium is found in Idaho (Bear River County) and in Utah (Carbon, Duchesne, Emery, Juab, Millard, Salt Lake, Sanpete, Sevier, Tooele, Uintah, Utah, Wasatch, and Weber counties), where it occurs mainly on the western foothills of the Wasatch Range. Plants often have a reddish tomentum rather than the grayish tomentum of the consistently capitate expressions of vars. bannockense, nanum, and caelitum. Plants from the Tavaputs Plateau with exceedingly long, narrow leaf blades have been segregated as var. huberi, but plants with even longer leaves occur elsewhere (as in the Soldier Summit area of Utah County, Utah), and the difference is not taxonomically significant.

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 +
(Torrey & A. Gray) Reveal +
deciduous +  and persistent +
stipelike +
Eriogonum kingii var. laxifolium +
roughened +  and papillate +
awn-tipped +  and simple +
9 cm90 mm <br />0.09 m <br /> (12 cm120 mm <br />0.12 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
greenish +  and grayish +
3 cm30 mm <br />0.03 m <br /> (9 cm90 mm <br />0.09 m <br />) +
linear;narrowly oblanceolate +
0.1cm;0.5cm +
not awn-tipped +
leaflike +  and semileaflike +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
glandular +, pubescent +  and glabrous +
scale-like +  and triangular +
not brittle +
spreading +  and erect +
tomentose +  and floccose +
scabrellous +
ridged +, angled +  and round +
whorled +, opposite +  and alternate +
Loose-leaf wild buckwheat +
Idaho +, Nev. +  and Utah. +
1400-2800 m +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
unisexual +, , +  and bisexual +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
dichotomous +  and scapelike +
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 to clayey flats, washes and slopes, mixed grassland, sagebrush, and mountain mahogany communities, juniper, oak and montane conifer woodlands +
reduced +
cymose +  and umbellate +
capitate +  and subcapitate +
10 cm100 mm <br />0.1 m <br /> (25 cm250 mm <br />0.25 m <br />) +
10 cm100 mm <br />0.1 m <br /> (15 cm150 mm <br />0.15 m <br />) +
dense +  and diffuse +
1-3 times and 2-5(-8) cm or capitate and 1-2 cm +
connate +  and free +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
glabrous +, floccose +  and tomentose +
turbinate +  and 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 +
7 cm70 mm <br />0.07 m <br /> (15 cm150 mm <br />0.15 m <br />) +
persistent +
1 cm10 mm <br />0.01 m <br /> (7 cm70 mm <br />0.07 m <br />) +
bractlike +
pubescent +  and glabrous +
not swollen +
orthotropous +
accrescent +
curved +  and straight +
tomentose;floccose or glabrous +
erect to deflexed +
0.3 cm3 mm <br />0.003 m <br /> (3 cm30 mm <br />0.03 m <br />) +
cylindric +  and urceolate +
accrescent +
fleshy +, indurate +  and membranous +
with extrafloral nectaries +  and not articulate +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
tomentose +  and floccose +
0.2 cm2 mm <br />0.002 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Flowering Jun–Sep. +
homostylous +  and 3-carpellate +
Great Basin Naturalist +
, +  and solid +
slender;stout +
persistent +
decumbent to erect +  and prostrate +
penicillate +, fimbriate +  and capitate +
deciduous +  and persistent +
? (?) +  and ? (?) +
coriaceous +  and membranous +
consisting of a series +  and tubular +
distinct +
erect;spreading or recurved +
Eriogonum brevicaule var. huberi +, Eriogonum brevicaule var. promiscuum +, Eriogonum brevicaule var. pumilum +, Eriogonum chrysocephalum +  and Eriogonum medium +
chambered +  and solid +
Slender (?) +  and Stout (?) +
Eriogonum brevicaule var. laxifolium +
Eriogonum brevicaule +
variety +
emarginate +  and entire +
0 +  and 1/2 +
1/4 +  and 1/3 +
oblong +  and obovate or ovate +
coriaceous +
erect +  and spreading +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
persistent +
membranous +
pubescent +  and glabrous +
greenish +  and green +
tomentose +  and floccose or glabrous +
synoecious +, monocarpic +, polycarpic +  and , +
3 +, 2 +  and 1 +