Eriogonum acaule

Nuttall

Proc. Acad. Nat. Sci. Philadelphia 4: 13. 1848.

Common names: Single-stem wild buckwheat
EndemicConservation concern
Synonyms: Eriogonum caespitosum subsp. acaule (Nuttall) S. Stokes Eriogonum caespitosum var. acaule (Nuttall) R. J. Davis
Treatment appears in FNA Volume 5. Treatment on page 270. Mentioned on page 234, 264.

Herbs, matted, not scapose, 0.15–0.3 × 1–2 dm, tomentose, greenish. Stems matted, with persistent leaf-bases, up to 1/8 height of plant; caudex stems matted; aerial flowering-stems erect, slender, solid, not fistulose, 0.05–0.2 dm, tomentose. Leaves sheathing entire stem, 1 per node or fasciculate; petiole 0.05–0.15 cm, glabrous; blade linear to oblanceolate, 0.3–0.8 × 0.1–0.2 cm, densely white-tomentose on both surfaces, margins revolute. Inflorescences cymose or racemose, condensed, 0.2–0.5 (–0.8) × 0.3–0.8 cm; branches dichotomous or secondaries suppressed, tomentose; bracts absent. Peduncles absent. Involucres 1 per node, campanulate, 1.5–3 × 1.5–3 mm, tomentose; teeth 4–5, erect to slightly spreading, 1–2 mm. Flowers 2–2.5 mm; perianth yellow, white-tomentose abaxially; tepals connate proximal 1/4, monomorphic, lanceolate; stamens exserted, 2.5–3 mm; filaments pilose proximally. Achenes light-brown, 2–2.5 mm, sparsely pubescent.


Phenology: Flowering May–Jul.
Habitat: Gravelly or clayey flats and slopes, saltbush or sagebrush communities
Elevation: 2000-2500 m

Discussion

Eriogonum acaule is the ultimate reduction in the E. brevicaule complex. The low, matted habit of this rather elegant species makes it attractive to rock garden enthusiasts. In Colorado, the Bureau of Land Management considers it a “sensitive” species; it is known only from Moffat County. It is encountered more frequently in Wyoming, where it is found in Albany, Carbon, Fremont, Lincoln, Natrona, Sublette, Sweetwater, Teton, and Uinta counties. The species is to be expected just south of the Daggett County line in northeastern Utah.

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.

... more about "Eriogonum acaule"
light-brown +
included +  and exserted +
3-gonous +
usually red +  and cream or yellow +
oblong +  and ellipsoid or oval +
James L. Reveal +
Nuttall +
deciduous +  and persistent +
stipelike +
Undefined subg. Eucycla +
papillate +
awn-tipped +  and simple +
0.3 cm3 mm <br />0.003 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
white-tomentose +
linear;oblanceolate +
0.1cm;0.2cm +
not awn-tipped +
leaflike +  and semileaflike +
glandular +, pubescent +  and glabrous +
scale-like +
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 +
Single-stem wild buckwheat +
Colo. +  and Wyo. +
2000-2500 m +
unisexual +, , +  and bisexual +
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 +
Gravelly or clayey flats and slopes, saltbush or sagebrush communities +
reduced +
condensed +  and cymose +
capitate +  and subcapitate +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
dense +  and diffuse +
cymelike +, paniclelike +, racemelike +  and spikelike +
connate +  and free +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
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 +
cauline +  and basal +
bractlike +
pubescent +  and glabrous +
lobed +, undulate +, crisped +, crenulate +  and entire +
not swollen +
orthotropous +
accrescent +
curved +  and straight +
erect to deflexed +
white-tomentose +
cylindric +  and urceolate +
accrescent +
fleshy +, indurate +  and membranous +
with extrafloral nectaries +  and not articulate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Flowering May–Jul. +
homostylous +  and 3-carpellate +
Proc. Acad. Nat. Sci. Philadelphia +
, +  and solid +
slender;stout +
persistent +
Endemic +  and Conservation concern +
entire +  and sheathing +
decumbent to erect +  and prostrate +
erect +, decumbent +  and spreading +
penicillate +, fimbriate +  and capitate +
deciduous +  and persistent +
? (?) +  and ? (?) +
coriaceous +  and membranous +
consisting of a series +  and tubular +
distinct +
erect;spreading or recurved +
Eriogonum caespitosum subsp. acaule +  and Eriogonum caespitosum var. acaule +
chambered +  and solid +
Slender (?) +  and Stout (?) +
Eriogonum acaule +
Eriogonum subg. Eucycla +
species +
emarginate +  and entire +
0 +  and 1/2 +
lanceolate +
coriaceous +
erect +  and slightly spreading +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
persistent +
membranous +
pubescent +  and glabrous +
herb +  and matted +
synoecious +, monocarpic +, polycarpic +  and , +
3 +, 2 +  and 1 +