Eriogonum ovalifolium var. pansum

Reveal

Phytologia 66: 259. 1989.

Common names: Branched cushion wild buckwheat
Endemic
Treatment appears in FNA Volume 5. Treatment on page 322. Mentioned on page 317, 320, 321.

Plants 2–5 dm wide. Leaf-blades usually elliptic, (0.6–) 1–2 (–2.5) cm, densely tomentose, margins not brownish. Scapes erect, (5–) 7–20 cm, thinly tomentose. Inflorescences umbellate, 1–5 (–7) × (1.5–) 2–5 cm, thinly tomentose; branches absent. Involucres 1 per node, 4–5 mm. Flowers 2.5–5 (–7) mm; perianth white.


Phenology: Flowering Jun–Aug.
Habitat: Sandy to gravelly flats and slopes, sagebrush communities, conifer woodlands
Elevation: 900-2200 m

Discussion

Variety pansum occurs in two disjunct series of scattered populations. One is in central Idaho (Blaine, Boise, Custer, Elmore, Lemhi, and Valley counties); the second is in western Montana (Lewis and Clark, Lincoln, Missoula, Powell, Sanders, and Silver Bow counties). This variety bridges the morphologic gap between E. ovalifolium and E. strictum var. proliferum. The inflorescence of var. pansum is umbellate with branches up to 3 cm long, but never compoundly branched as in E. strictum. The umbellate condition becomes obvious only in late anthesis or during early fruit-set, so immature plants of var. pansum might be mistaken for var. purpureum, large specimens of var. depressum, or short-scaped plants of var. ochroleucum. Still, careful observation of such specimens will show an early branching condition, although this can be obscured by bracts subtending the inflorescence or an abundance of early flowers in the numerous involucres. The branched cushion wild buckwheat is certainly worth consideration as an ornamental.

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.

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 +
Reveal +
deciduous +  and persistent +
stipelike +
Undefined subg. Eucycla +
papillate +
2 cm20 mm <br />0.02 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
awn-tipped +  and simple +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (6 cm60 mm <br />0.06 m <br />) +
lanate +  and tomentose or floccose +
oblanceolate;elliptic or spatulate +
0.2 cm2 mm <br />0.002 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
not awn-tipped +
leaflike +  and semileaflike +
glandular +, pubescent +  and glabrous +
linear +  and triangular +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
grooved +, branched +  and open +
not brittle +
spreading +  and erect +
tomentose +  and floccose or glabrous occasionally lanate or glandular +
scabrellous +
ridged +, angled +  and round +
whorled +, opposite +  and alternate +
Branched cushion wild buckwheat +
Idaho +  and Mont. +
900-2200 m +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
unisexual +, , +  and bisexual +
not attenuate +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.5 cm5 mm <br />0.005 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 to gravelly flats and slopes, sagebrush communities, conifer woodlands +
reduced +
capitate +  and subcapitate +
5 cm50 mm <br />0.05 m <br /> (7 cm70 mm <br />0.07 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
dense +  and diffuse +
1 cm10 mm <br />0.01 m <br /> (5 cm50 mm <br />0.05 m <br />) +
cymelike +, paniclelike +, racemelike +  and spikelike +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
connate +  and free +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
tomentose +  and floccose +
turbinate +  and turbinate-campanulate +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
nonmembranous +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
in whorls +, opposite +, alternate +  and rosulate +
persistent +
bractlike +
not brownish +
pubescent +  and glabrous +
not swollen +
orthotropous +
accrescent +
curved +  and straight +
erect to deflexed +
cylindric +  and urceolate +
accrescent +
fleshy +, indurate +  and membranous +
0.1 cm1 mm <br />0.001 m <br /> (10 cm100 mm <br />0.1 m <br />) +
Flowering Jun–Aug. +
homostylous +  and 3-carpellate +
, +  and solid +
slender;stout +
5 cm50 mm <br />0.05 m <br /> (7 cm70 mm <br />0.07 m <br />) +
7 cm70 mm <br />0.07 m <br /> (20 cm200 mm <br />0.2 m <br />) +
persistent +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
decumbent to erect +  and prostrate +
decumbent +  and spreading +
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 +
Eucycla ovalifolia +
chambered +  and solid +
slender +  and stout +
Eriogonum ovalifolium var. pansum +
Eriogonum ovalifolium +
variety +
emarginate +  and entire +
in proximal 1/2 +  and connate +
0 +  and 1/2 +
lobed +  and laciniate +
coriaceous +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
persistent +
membranous +
pubescent +  and glabrous +
floccose +  and tomentose or lanate +
synoecious +, monocarpic +, polycarpic +  and , +
3 +, 2 +  and 1 +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +