Eriogonum pauciflorum

Pursh

Fl. Amer. Sept. 2: 735. 1813.

Common names: Few-flower wild buckwheat
IllustratedEndemic
Synonyms: Eriogonum depauperatum Small Eriogonum gnaphalodes Bentham Eriogonum multiceps Nees Eriogonum pauciflorum var. gnaphalodes (Bentham) Reveal
Treatment appears in FNA Volume 5. Treatment on page 284. Mentioned on page 240, 241, 242, 248.

Herbs, loosely matted, usually scapose, 0.5–2 × 0.5–3 dm, tomentose, grayish. Stems spreading, usually with persistent leaf-bases, up to 1/4 height of plant; caudex stems matted; aerial flowering-stems scapelike, erect or nearly so, slender, solid, not fistulose, 0.3–2 dm, tomentose. Leaves fasciculate in terminal tufts, sometimes 1 per node and sheathing up stem 1–5 cm; petiole 1–5 cm, tomentose to lanate; blade linear-oblanceolate to oblanceolate or narrowly spatulate to elliptic, 1–4 × 0.1–1 cm, grayish or whitish-tomentose abaxially, less so to subglabrous (or rarely glabrous) adaxially or white-lanate on both surfaces, margins plane. Inflorescences capitate, subcapitate, or cymose-umbellate, 1–5 × 1–2 cm; branches absent or dichotomous; bracts 2–6, linear to lanceolate, scalelike to semileaflike, 1.5–20 × 1–5 mm. Peduncles absent. Involucres 1 per node or 2–5 (–7) per cluster, narrowly turbinate, (3.5–) 4–5 × (1.5–) 2–3 mm, rigid, floccose to tomentose; teeth 5, erect, 0.5–0.8 mm. Flowers 2–2.5 mm; perianth whitish brown to rose, pubescent, rarely glabrous; tepals connate proximal 1/3, monomorphic, oblong; stamens exserted, 2.5–3 mm; filaments pilose proximally. Achenes light-brown to brown, 2–2.5 mm, glabrous.


Phenology: Flowering May–Sep.
Habitat: Clay to gravelly flats, washes, and slopes, grassland and sagebrush communities, juniper woodlands
Elevation: 600-1800 m

Distribution

V5 554-distribution-map.gif

Man., Sask., Colo., Mont., Nebr., N.Dak., S.Dak., Wyo.

Discussion

Eriogonum pauciflorum is the common, matted wild buckwheat on the Great Plains. The species occurs in southern Manitoba and Saskatchewan, northeastern Colorado, Montana, western Nebraska, North Dakota, Nebraska, South Dakota, and Wyoming. Plants from southeastern Wyoming, northeastern Colorado and western Nebraska have somewhat broader leaf blades (spatulate to elliptic rather than linear-oblanceolate to oblanceolate) that are densely tomentose to lanate on both surfaces (rather than loosely tomentose abaxially and less so or glabrous adaxially). Such plants have been distinguished as var. gnaphalodes. This expression would be worthy of a place in the rock garden. A hybrid between var. pauciflorum and E. effusum has been named E. ×nebraskense Rydberg (see 2. E. effusum). The hybrid is known from Weld County, Colorado, Cheyenne, Dawes, Kimball, and Sioux counties, Nebraska, and Converse and Platte counties, Wyoming.

Selected References

None.

Lower Taxa

None.

"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 pauciflorum"
light-brown;brown +
included +  and exserted +
3-gonous +
usually red +  and cream or yellow +
oblong +  and ellipsoid or oval +
acute;obtuse or rounded +
James L. Reveal +
deciduous +  and persistent +
stipelike +
Undefined subg. Eucycla +
papillate +
awn-tipped +  and simple +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
white-lanate +, subglabrous +  and whitish-tomentose +
linear-oblanceolate;oblanceolate or narrowly spatulate +
0.1 cm1 mm <br />0.001 m <br /> (1 cm10 mm <br />0.01 m <br />) +
not awn-tipped +
leaflike +  and semileaflike +
0.15 cm1.5 mm <br />0.0015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
glandular +, pubescent +  and glabrous +
linear +  and lanceolate scalelike +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
not brittle +
spreading +  and erect +
tomentose +  and floccose or glabrous occasionally lanate or glandular +
scabrellous +
ridged +, angled +  and round +
spreading +  and erect +
whorled +, opposite +  and alternate +
Few-flower wild buckwheat +
Man. +, Sask. +, Colo. +, Mont. +, Nebr. +, N.Dak. +, S.Dak. +  and Wyo. +
600-1800 m +
unisexual +, , +  and bisexual +
not attenuate +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 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 +
Clay to gravelly flats, washes, and slopes, grassland and sagebrush communities, juniper woodlands +
reduced +
cymose-umbellate +  and subcapitate +
dense +  and diffuse +
1 cm10 mm <br />0.01 m <br /> (5 cm50 mm <br />0.05 m <br />) +
cymelike +, paniclelike +, racemelike +  and spikelike +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
connate +  and free +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
floccose +  and tomentose +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
in whorls +, opposite +, alternate +  and rosulate +
persistent +
cauline +  and basal +
bractlike +
pubescent +  and glabrous +
not swollen +
orthotropous +
accrescent +
curved +  and straight +
erect to deflexed +
whitish brown;rose +
glabrous +  and pubescent +
cylindric +  and urceolate +
accrescent +
fleshy +, indurate +  and membranous +
with extrafloral nectaries +  and not articulate +
tomentose +  and lanate +
1 cm10 mm <br />0.01 m <br /> (5 cm50 mm <br />0.05 m <br />) +
Flowering May–Sep. +
homostylous +  and 3-carpellate +
Fl. Amer. Sept. +
, +  and solid +
slender;stout +
persistent +
Illustrated +  and Endemic +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
decumbent to erect +  and prostrate +
glandular +, pubescent +  and glabrous +
1 cm10 mm <br />0.01 m <br /> (5 cm50 mm <br />0.05 m <br />) +
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 depauperatum +, Eriogonum gnaphalodes +, Eriogonum multiceps +  and Eriogonum pauciflorum var. gnaphalodes +
chambered +  and solid +
slender +  and stout +
Eriogonum pauciflorum +
Eriogonum subg. Eucycla +
species +
emarginate +  and entire +
0 +  and 1/2 +
coriaceous +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
persistent +
membranous +
pubescent +  and glabrous +
herb +  and matted +
synoecious +, monocarpic +, polycarpic +  and , +
3 +, 2 +  and 1 +