Eriogonum brevicaule var. cottamii

(S. Stokes) Reveal

Great Basin Naturalist 32: 113. 1972.

Common names: Cottam’s wild buckwheat
Endemic
Basionym: Eriogonum tenellum subsp. cottamii S. Stokes Eriogonum, 70. 1936 (as cottami)
Treatment appears in FNA Volume 5. Treatment on page 266. Mentioned on page 264, 265, 270.

Plants erect, 1–3.5 × 2–5 dm. Aerial flowering-stems erect, 0.5–2 dm, tomentose. Leaves: blade narrowly oblanceolate to narrowly elliptic; leaf-blades (2–) 3–4 (–4.5) × 0.3–0.5 (–0.7) cm, margins plane. Inflorescences cymose, usually divided 3 or more times, 2–7 cm; branches tomentose. Involucres usually 1 per node, turbinate, 2–3 (–3.5) × 1.5–2 (–2.5) mm, tomentose. Flowers (2.5–) 3–4 mm; perianth yellow, glabrous.


Phenology: Flowering Jun–Sep.
Habitat: Gravelly limestone slopes and clay hills, sagebrush communities, oak and pinyon-juniper woodlands
Elevation: 1300-2100 m

Discussion

Variety cottamii is infrequent in the desert ranges west of the Wasatch Range in eastern portions of Juab, Millard, and Tooele counties, the southwestern corner of Salt Lake County, and in western Utah County. The attractive tomentum of Cottam’s wild buckwheat changes from a gray to tannish- or reddish-brown as the plant matures, and the species is worthy of horticultural consideration. The narrow leaf blades of var. cottamii readily distinguish it from the more western E. natum.

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 +
(S. Stokes) Reveal +
deciduous +  and persistent +
stipelike +
Eriogonum tenellum subsp. cottamii +
roughened +  and papillate +
awn-tipped +  and simple +
10 cm100 mm <br />0.1 m <br /> (12 cm120 mm <br />0.12 m <br />) +
0.9 cm9 mm <br />0.009 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
1 cm10 mm <br />0.01 m <br /> (10 cm100 mm <br />0.1 m <br />) +
narrowly oblanceolate;narrowly elliptic +
0.1cm;0.9cm +
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 +
scabrellous +
ridged +, angled +  and round +
whorled +, opposite +  and alternate +
Cottam’s wild buckwheat +
1300-2100 m +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
unisexual +, , +  and bisexual +
0.3 cm3 mm <br />0.003 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 +
Gravelly limestone slopes and clay hills, sagebrush communities, oak and pinyon-juniper woodlands +
reduced +
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 +
2 cm20 mm <br />0.02 m <br /> (7 cm70 mm <br />0.07 m <br />) +
connate +  and free +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
nonmembranous +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
4 cm40 mm <br />0.04 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 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 campanulatum subsp. brevicaule +
chambered +  and solid +
Slender (?) +  and Stout (?) +
Eriogonum brevicaule var. cottamii +
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 +