Eriogonum dasyanthemum

Torrey & A. Gray

Proc. Amer. Acad. Arts 8: 177. 1870.

Common names: Chaparral wild buckwheat
Endemic
Treatment appears in FNA Volume 5. Treatment on page 429. Mentioned on page 415.

Herbs, erect to spreading, 2–6 dm, floccose to tomentose, rarely glabrous, grayish to reddish. Stems: aerial flowering-stems erect, 0.5–2 dm, floccose to tomentose, rarely glabrous. Leaves basal and occasionally cauline; basal: petiole (0.5–) 1–3 cm, usually tomentose, blade broadly obovate to roundish, (0.3–) 1–2 × (0.3–) 1–2 cm, white-tomentose abaxially, floccose to glabrate or glabrous and greenish adaxially; cauline sessile, blade broadly obovate to roundish, rarely elliptic, 0.5–1.5 (–3) × 0.5–1 (–2) cm, similar to basal blade. Inflorescences cymose, not distally uniparous due to suppression of secondary branches, mostly open, 10–50 × 10–50 cm; branches floccose to glabrate, rarely glabrous; bracts 0.5–2.5 × 1–3 mm. Peduncles absent. Involucres appressed to branches, cylindric, (3.8–) 4–4.5 × 2–3 mm, glabrate; teeth 5, erect, 0.2–0.5 mm. Flowers (1.8–) 2–2.5 mm; perianth white to rose, densely pubescent; tepals monomorphic, oblong-obovate; stamens included, 1.5–2 mm; filaments pilose proximally. Achenes brown, 3-gonous, 1.5–2 mm, glabrous; beak scabrous. 2n = 24.


Phenology: Flowering May–Oct.
Habitat: Sandy to gravelly flats and slopes, mixed grassland and chaparral communities, oak and pine woodlands
Elevation: 50-1400 m

Distribution

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Calif.

Discussion

Eriogonum dasyanthemum is common to locally abundant in the North Coast Ranges (Colusa, Glenn, Lake, Mendocino, Napa, Shasta, Solano, Tehama, Trinity, and Yolo counties). A single collection apparently made at Mendocino along the Pacific Ocean in Mendocino County (Brown 942, Aug 1898, B, BKL, F, GH, IND, MO, RM) requires modern confirmation. Jepson 8962 (JEPS, UTC) supposedly was gathered “above Venado” in Colusa County, but Venado is a small town in Sonoma County. The densely pubescent flowers easily distinguish this species.

Selected References

None.

Lower Taxa

None.

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

... more about "Eriogonum dasyanthemum"
included +  and exserted +
3-gonous +
usually red +  and cream or yellow +
oblong +  and ellipsoid or oval +
James L. Reveal +
Torrey & A. Gray +
deciduous +  and persistent +
stipelike +  and acute +
Eriogonum sect. Oregonium +
awn-tipped +  and simple +
1.5 cm15 mm <br />0.015 m <br /> - 3 cm30 mm <br />0.03 m <br /> +
1 cm10 mm <br />0.01 m <br /> - 2 cm20 mm <br />0.02 m <br /> +
0.5 cm5 mm <br />0.005 m <br /> - 1.5 cm15 mm <br />0.015 m <br /> +
floccose +  and glabrate or glabrous +
broadly obovate;roundish +
0.5 cm5 mm <br />0.005 m <br /> - 1 cm10 mm <br />0.01 m <br /> +
not awn-tipped +
0.05 cm0.5 mm <br />5.0e-4 m <br /> - 0.25 cm2.5 mm <br />0.0025 m <br /> +
glandular +, pubescent +  and glabrous +
scale-like +
0.1 cm1 mm <br />0.001 m <br /> - 0.3 cm3 mm <br />0.003 m <br /> +
grooved +, disarticulating +  and dichotomous +
not brittle +
glabrous +, floccose +  and glabrate +
scabrellous +
ridged +, angled +  and round +
spreading +  and erect +
whorled +, opposite +  and alternate +
Chaparral wild buckwheat +
50-1400 m +
0.18 cm1.8 mm <br />0.0018 m <br /> - 0.2 cm2 mm <br />0.002 m <br /> +
unisexual +, , +  and bisexual +
0.2 cm2 mm <br />0.002 m <br /> - 0.25 cm2.5 mm <br />0.0025 m <br /> +
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 and slopes, mixed grassland and chaparral communities, oak and pine woodlands +
open +, uniparous +  and cymose +
capitate +  and subcapitate +
10 cm100 mm <br />0.1 m <br /> - 50 cm500 mm <br />0.5 m <br /> +
cymelike +, paniclelike +, racemelike +  and spikelike +
10 cm100 mm <br />0.1 m <br /> - 50 cm500 mm <br />0.5 m <br /> +
connate +  and free +
0.38 cm3.8 mm <br />0.0038 m <br /> - 0.4 cm4 mm <br />0.004 m <br /> +
0.4 cm4 mm <br />0.004 m <br /> - 0.45 cm4.5 mm <br />0.0045 m <br /> +
nonmembranous +
0.2 cm2 mm <br />0.002 m <br /> - 0.3 cm3 mm <br />0.003 m <br /> +
in whorls +, opposite +, alternate +  and rosulate +
marcescent +
persistent +
cauline +  and basal +
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 /> - 1 cm10 mm <br />0.01 m <br /> +
1 cm10 mm <br />0.01 m <br /> - 3 cm30 mm <br />0.03 m <br /> +
Flowering May–Oct. +
homostylous +  and 3-carpellate +
Proc. Amer. Acad. Arts +
, +  and solid +
slender;stout +
persistent +
0.15 cm1.5 mm <br />0.0015 m <br /> - 0.2 cm2 mm <br />0.002 m <br /> +
decumbent to erect +  and prostrate +
erect +, ascending +  and prostrate +
short-pilose +, puberulent +, sericeous +, glabrous +, floccose +, tomentose +  and lanate +
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 +
chambered +  and solid +
slender +  and stout +
Eriogonum dasyanthemum +
Eriogonum subg. Oregonium +
species +
emarginate +  and entire +
1/4 +  and 1/2 +
oblong-obovate +
coriaceous +
0.02 cm0.2 mm <br />2.0e-4 m <br /> - 0.05 cm0.5 mm <br />5.0e-4 m <br /> +
involucral +
persistent +
membranous +
pubescent +  and glabrous +
short-pilose +, puberulent +, sericeous +, floccose +  and tomentose or lanate +
grayish +  and reddish +
annual +, biennial +  and perennial +
glabrous +, floccose +  and tomentose +
synoecious +, monocarpic +, polycarpic +  and , +
3 +, 2 +  and 1 +