Eriogonum bifurcatum

Reveal

Aliso 7: 357. 1971.

Common names: Pahrump Valley wild buckwheat
EndemicConservation concern
Treatment appears in FNA Volume 5. Treatment on page 397. Mentioned on page 384, 398.

Herbs, spreading, annual, 1–4 dm, glabrous, greenish to grayish. Stems: caudex absent; aerial flowering-stems erect, solid, not fistulose, 0.05–0.3 dm, often obscured by leaves, glabrous. Leaves basal; petiole 1–4 cm, tomentose; blade round-cordate, 1–3 × 1–3 cm, densely white-tomentose abaxially, less so to floccose and greenish adaxially, margins plane. Peduncles absent or erect, straight, slender, 0.1–0.5 cm, glabrous. Inflorescences cymose, spreading and flat-topped, 5–30 × 10–50 cm; branches glabrous; bracts scalelike, 1–1.5 × 0.4–1 mm. Involucres turbinate, 2–2.5 × 1.3–2 mm; teeth 5, erect, 0.4–0.5 mm. Flowers 1.5–2 mm, glabrous; perianth white with greenish to reddish midribs, becoming faintly pinkish, glabrous; tepals dimorphic, those of outer whorl obovate to cordate, those of inner whorl lanceolate; stamens exserted, 2–3 mm; filaments pilose proximally. Achenes light-brown, 3-gonous, 2–2.3 mm, glabrous. 2n = 40.


Phenology: Flowering May–Jun.
Habitat: Alkaline sandy flats and slopes, saltbush communities
Elevation: 600-800 m

Discussion

Of conservation concern.

Eriogonum bifurcatum is restricted to the Mesquite, Pahrump, and Stewart valleys along the California-Nevada border in southeastern Inyo, northwestern Clark, and southwestern Nye counties. It is closely related to E. exaltatum, and spring-flowering specimens of the latter are impossible to distinguish from mature individuals of E. bifurcatum. The Las Vegas populations (last collected in 1941) formerly called E. bifurcatum are here tentatively assigned to E. exaltatum. The Pahrump Valley wild buckwheat is currently considered a “sensitive” species, and habitat protection is being considered.

Selected References

None.

Lower Taxa

None.

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

... more about "Eriogonum bifurcatum"
light-brown +
included +  and exserted +
3-gonous +
usually red +  and cream or yellow +
oblong +  and ellipsoid or oval +
James L. Reveal +
Reveal +
deciduous +  and persistent +
stipelike +
Eriogonum sect. Ganysma +
awn-tipped +  and simple +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
floccose +  and white-tomentose +
round-cordate +
1cm;3cm +
not awn-tipped +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
glandular +, pubescent +  and glabrous +
scale-like +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
grooved +, disarticulating +  and dichotomous +
not brittle +
scabrellous +
ridged +, angled +  and round +
spreading +  and erect +
whorled +, opposite +  and alternate +
Pahrump Valley wild buckwheat +
Calif. +  and Nev. +
600-800 m +
unisexual +, , +  and bisexual +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
decumbent to erect +  and prostrate +
not fistulose +
slender;stout +
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 +
Alkaline sandy flats and slopes, saltbush communities +
capitate +  and subcapitate +
racemose +, paniculate +  and cymose-paniculate +
connate +  and free +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
nonmembranous +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
in whorls +, opposite +, alternate +  and rosulate +
marcescent +
persistent +
bractlike +
pubescent +  and glabrous +
greenish +  and reddish +
not swollen +
orthotropous +
accrescent +
erect to deflexed +
filiform;capillary +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
cylindric +  and urceolate +
accrescent +
fleshy +, indurate +  and membranous +
with extrafloral nectaries +  and not articulate +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
Flowering May–Jun. +
homostylous +  and 3-carpellate +
, +  and solid +
slender;stout +
persistent +
Endemic +  and Conservation concern +
decumbent to erect +  and prostrate +
spreading +  and erect +
penicillate +, fimbriate +  and capitate +
deciduous +  and persistent +
? (?) +  and ? (?) +
coriaceous +  and membranous +
consisting of a series +  and tubular +
distinct +
erect;spreading or recurved +
chambered +  and solid +
Slender (?) +  and Stout (?) +
Eriogonum bifurcatum +
Eriogonum subg. Ganysma +
species +
emarginate +  and entire +
1/5 +  and 1/2 +
lobed +  and laciniate +
coriaceous +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
persistent +
membranous +
pubescent +  and glabrous +
annual +  and perennial +
greenish +  and grayish +
synoecious +, monocarpic +, polycarpic +  and , +
3 +, 2 +  and 1 +