Eriogonum flavum var. piperi

(Greene) M. E. Jones

Contr. W. Bot. 11: 7. 1903.

Common names: Piper’s wild buckwheat
Endemic
Basionym: Eriogonum piperi Greene Pittonia 3: 263. 1898
Synonyms: Eriogonum flavum subsp. piperi (Greene) S. Stokes
Treatment appears in FNA Volume 5. Treatment on page 372. Mentioned on page 371.

Plants loose to compact mats, 1–6 dm wide. Aerial flowering-stems mostly erect, (0.5–) 1–2 (–3) dm. Leaf-blades linear-oblanceolate to oblong or narrowly elliptic, 2–7 (–9) × 0.3–0.8 (–1) cm, densely tomentose abaxially, tomentose to floccose or glabrous and greenish adaxially. Inflorescences subcapitate to umbellate; branches 0.2–1 cm. Involucres usually turbinate, 4–9 mm. Flowers (4–) 5–7 mm, including 1–1.5 mm stipelike base; perianth pale to bright-yellow. 2n = 76, 80.


Phenology: Flowering Jun–Sep.
Habitat: Sandy to gravelly flats and slopes in mixed grassland and sagebrush communities, and in montane to subalpine conifer woodlands
Elevation: (700-)1200-2800(-3200) m

Distribution

V5 767-distribution-map.gif

Alta., B.C., Idaho, Mont., Oreg., Wash., Wyo.

Discussion

Variety piperi is the common and widespread phase of the species, found mainly west of the Continental Divide in southern Alberta, southern British Columbia, eastern Washington, northern Idaho, and western Montana south into northeastern Oregon and northwestern Wyoming. It is only slightly variable, the major exception being depauperate individuals at high elevations in harsh exposures; these have been recognized by some as var. polyphyllum. The length of the stipelike base shortens from west to east, but only rarely are individuals in Montana troublesome to place either here or in var. flavum. The plants do well in cultivation and are now widely available.

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."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."dm" is not declared as a valid unit of measurement for this property.

light-brown;brown +
included +  and exserted +
3-gonous +, lenticular +  and ridged +
usually red +  and cream or yellow +
oblong +  and ellipsoid or oval +
James L. Reveal +
(Greene) M. E. Jones +
deciduous +  and persistent +
stipelike +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Eriogonum piperi +
awn-tipped +  and simple +
7 cm70 mm <br />0.07 m <br /> (9 cm90 mm <br />0.09 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
green +  and whitish +
1 cm10 mm <br />0.01 m <br /> (7 cm70 mm <br />0.07 m <br />) +
mostly tomentose +  and floccose or glabrous +
linear-oblanceolate;oblong or elliptic +
0.5cm;1.5cm +
not awn-tipped +
leaflike +  and semileaflike +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
glandular +, pubescent +  and glabrous +
scale-like +  and semileaflike +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
grooved +, disarticulating +  and dichotomous +
not brittle +
tomentose +  and floccose +
scabrellous +
ridged +, angled +  and round +
spreading +  and erect +
whorled +, opposite +  and alternate +
Piper’s wild buckwheat +
Alta. +, B.C. +, Idaho +, Mont. +, Oreg. +, Wash. +  and Wyo. +
(700-)1200-2800(-3200) m +
straight +  and curved +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
unisexual +, , +  and bisexual +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 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 in mixed grassland and sagebrush communities, and in montane to subalpine conifer woodlands +
subcapitate +  and umbellate +
capitate +  and subcapitate +
cymelike +, paniclelike +, racemelike +  and spikelike +
connate +  and free +
0.3 cm3 mm <br />0.003 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
tomentose +  and floccose +
0.4 cm4 mm <br />0.004 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
nonmembranous +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
7 cm70 mm <br />0.07 m <br /> (9 cm90 mm <br />0.09 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
2 cm20 mm <br />0.02 m <br /> (7 cm70 mm <br />0.07 m <br />) +
tomentose +  and floccose or glabrous +
0.3 cm3 mm <br />0.003 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
in whorls +, opposite +, alternate +  and rosulate +
persistent +
bractlike +
pubescent +  and glabrous +
not swollen +
orthotropous +
accrescent +
curved +  and straight +
erect to deflexed +
cylindric +  and urceolate +
accrescent +
fleshy +, indurate +  and membranous +
with extrafloral nectaries +  and not articulate +
tomentose +  and floccose +
0.5 cm5 mm <br />0.005 m <br /> (4 cm40 mm <br />0.04 m <br />) +
Flowering Jun–Sep. +
homostylous +  and 3-carpellate +
Contr. W. Bot. +
, +  and solid +
slender;stout +
persistent +
decumbent to erect +  and prostrate +
prostrate +  and erect +
penicillate +, fimbriate +  and capitate +
deciduous +  and persistent +
? (?) +  and ? (?) +
coriaceous +  and membranous +
consisting of a series +  and tubular +
distinct +
erect;spreading or recurved +
Eriogonum flavum subsp. piperi +
chambered +  and solid +
Slender (?) +  and Stout (?) +
Eriogonum flavum var. piperi +
Eriogonum flavum +
variety +
emarginate +  and entire +
0 +  and 1/2 +
coriaceous +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
persistent +
membranous +
pubescent +  and glabrous +
loose +  and compact +
annual +, biennial +  and perennial +
tomentose +  and floccose +
synoecious +, monocarpic +, polycarpic +  and , +
3 +, 2 +  and 1 +