Eriogonum brachyanthum

Coville

Contr. U.S. Natl. Herb. 4: 185. 1893.

Common names: Short-flower wild buckwheat
Endemic
Synonyms: Eriogonum baileyi var. brachyanthum (Coville) Jepson Eriogonum vimineum var. brachyanthum (Coville) S. Stokes
Treatment appears in FNA Volume 5. Treatment on page 426. Mentioned on page 415, 425, 427.

Herbs, spreading, (0.5–) 1–3 dm, glabrous, greenish. Stems: aerial flowering-stems erect, 0.3–0.8 dm, glabrous. Leaves basal; petiole 0.5–3 cm, tomentose; blade ovate to rounded, 0.5–2 × 0.5–2 cm, densely white-tomentose on both surfaces, rarely glabrate and grayish or greenish adaxially. Inflorescences cymose, occasionally distally uniparous due to suppression of secondary branches, usually diffuse, 5–25 × 5–30 cm; branches glabrous; bracts 0.5–2 × 0.5–2 mm. Peduncles absent. Involucres somewhat appressed to branches, turbinate, 1–1.2 × 0.4–0.6 mm, glabrous; teeth 5, erect, 0.2–0.3 mm. Flowers 0.6–0.8 (–1) mm; perianth yellow or pale yellowish, rarely whitish, glabrous; tepals slightly dimorphic, those of outer whorl oblong to oblong-obovate, those of inner whorl narrowly oblong; stamens included, 0.5–0.8 mm; filaments pilose proximally. Achenes dark-brown, 3-gonous, 0.8–1 mm.


Phenology: Flowering Apr–Nov.
Habitat: Sandy to gravelly flats, washes, and slopes, saltbush, greasewood, and sagebrush communities, pinyon-juniper and montane conifer woodlands
Elevation: 600-2300 m

Discussion

Eriogonum brachyanthum basically is a species of the Mojave Desert, extending northward in eastern California (Inyo, Kern, Los Angeles, Mono, Riverside, and San Bernardino counties) and along the Lahontan Trough of Nevada (Churchill, Esmeralda, Eureka, Humboldt, Lander, Lyon, Mineral, Nye, Pershing, and Washoe counties) to just north of Denio in Harney County, Oregon. It is common to abundant and even locally weedy in the northern Mojave Desert. Elsewhere it is less common and much more widely scattered. It often is found with other annual wild buckwheats forming dense patches (especially along highways) composed of several (up to seven in places) species, and care must be taken to sort them properly when making herbarium specimens.

Selected References

None.

Lower Taxa

None.

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

... more about "Eriogonum brachyanthum"
included +  and exserted +
3-gonous +
usually red +  and cream or yellow +
oblong +  and ellipsoid or oval +
James L. Reveal +
Coville +
deciduous +  and persistent +
stipelike +  and acute +
Eriogonum sect. Oregonium +
awn-tipped +  and simple +
greenish +  and grayish +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
glabrate +  and white-tomentose +
ovate;rounded +
0.5cm;2cm +
not awn-tipped +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
glandular +, pubescent +  and glabrous +
scale-like +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
grooved +, disarticulating +  and dichotomous +
not brittle +
scabrellous +
ridged +, angled +  and round +
spreading +  and erect +
whorled +, opposite +  and alternate +
Short-flower wild buckwheat +
Calif. +, Nev. +  and Oreg. +
600-2300 m +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
unisexual +, , +  and bisexual +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
narrowing +
not disarticulating +  and solid +
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 +
Sandy to gravelly flats, washes, and slopes, saltbush, greasewood, and sagebrush communities, pinyon-juniper and montane conifer woodlands +
uniparous +  and cymose +
capitate +  and subcapitate +
cymelike +, paniclelike +, racemelike +  and spikelike +
connate +  and free +
0.1 cm1 mm <br />0.001 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
nonmembranous +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
in whorls +, opposite +, alternate +  and rosulate +
marcescent +
persistent +
bractlike +
pubescent +  and glabrous +
lobed +, undulate +, crisped +, crenulate +  and entire +
not swollen +
orthotropous +
accrescent +
erect to deflexed +
cylindric +  and urceolate +
accrescent +
fleshy +, indurate +  and membranous +
with extrafloral nectaries +  and not articulate +
0.5 cm5 mm <br />0.005 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Flowering Apr–Nov. +
homostylous +  and 3-carpellate +
Contr. U.S. Natl. Herb. +
, +  and solid +
slender;stout +
persistent +
decumbent to erect +  and prostrate +
erect +, ascending +  and prostrate +
penicillate +, fimbriate +  and capitate +
deciduous +  and persistent +
? (?) +  and ? (?) +
coriaceous +  and membranous +
consisting of a series +  and tubular +
distinct +
erect;spreading or recurved +
Eriogonum baileyi var. brachyanthum +  and Eriogonum vimineum var. brachyanthum +
chambered +  and solid +
Slender (?) +  and Stout (?) +
Eriogonum brachyanthum +
Eriogonum subg. Oregonium +
species +
emarginate +  and entire +
1/4 +  and 1/2 +
lobed +  and laciniate +
coriaceous +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
involucral +
persistent +
membranous +
pubescent +  and glabrous +
short-pilose +, puberulent +, sericeous +, floccose +  and tomentose or lanate +
annual +, biennial +  and perennial +
synoecious +, monocarpic +, polycarpic +  and , +
3 +, 2 +  and 1 +