Eriogonum argillosum

J. T. Howell

Leafl. W. Bot. 1: 13. 1932.

Common names: Coast Range wild buckwheat
Endemic
Treatment appears in FNA Volume 5. Treatment on page 419. Mentioned on page 414.

Herbs, erect, 1–3 dm, glabrous or rarely sparsely floccose, mostly greenish. Stems: aerial flowering-stems erect, (0.3–) 0.5–1.5 (–2.5) dm, glabrous, rarely sparsely floccose. Leaves basal and cauline; basal: petiole (0.5–) 1–4 (–5) cm, sparsely floccose, blade oblong, 1–3 (–5) × 0.3–1.2 (–1.6) cm, densely white-tomentose abaxially, floccose to glabrate and greenish adaxially; cauline: petiole 0.3–2 cm, sparsely floccose, blade elliptic to oblong, 0.5–1.5 × 0.2–0.8 cm, similar to basal blade. Inflorescences cymose, occasionally distally uniparous due to suppression of secondary branches, open, (2–) 5–20 (–25) cm; branches glabrous or rarely sparsely floccose; bracts 1–5 (–7) × 0.5–1 (–1.5) mm. Peduncles erect, straight, slender, 0.5–4.5 (–6) cm, glabrous. Involucres terminal at tips of slender branchlets proximally, not appressed to branches, turbinate, (2–) 2.5–3 × 2–3 mm, glabrous; teeth 5, erect, 0.2–0.5 mm. Flowers 1.5–2 mm; perianth white to rose, glabrous; tepals monomorphic, oblong; stamens mostly included, 1–2 mm; filaments glabrous; styles 0.2–0.3 mm. Achenes brown, 3-gonous, 2–2.5 mm, glabrous; beak smooth.


Phenology: Flowering Mar–Oct.
Habitat: Clay to serpentine outcrops and slopes, mixed grassland and chaparral communities, oak and pine woodlands
Elevation: 100-600 m

Discussion

Eriogonum argillosum is rare to locally infrequent in coastal central California. It was last seen in Santa Clara County in 1895 and now is almost certainly extirpated there. Otherwise, it is found in the San Benito River Canyon (San Benito County) area and east of San Lucas (Monterey County). This is the most distinct of the five species in the E. eastwoodianum complex.

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.

... more about "Eriogonum argillosum"
included +  and exserted +
3-gonous +
usually red +  and cream or yellow +
oblong +  and ellipsoid or oval +
James L. Reveal +
J. T. Howell +
deciduous +  and persistent +
stipelike +  and acute +
Eriogonum sect. Oregonium +
awn-tipped +  and simple +
3 cm30 mm <br />0.03 m <br /> (5 cm50 mm <br />0.05 m <br />) +
1.2 cm12 mm <br />0.012 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
floccose +  and glabrate +
elliptic;oblong +
0.2cm;0.8cm +
not awn-tipped +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
glandular +, pubescent +  and glabrous +
scale-like +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
grooved +, disarticulating +  and dichotomous +
not brittle +
floccose +  and glabrous +
scabrellous +
ridged +, angled +  and round +
spreading +  and erect +
whorled +, opposite +  and alternate +
Coast Range wild buckwheat +
100-600 m +
unisexual +, , +  and bisexual +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 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 +
Clay to serpentine outcrops and slopes, mixed grassland and chaparral communities, oak and pine woodlands +
open +, uniparous +  and cymose +
capitate +  and subcapitate +
20 cm200 mm <br />0.2 m <br /> (25 cm250 mm <br />0.25 m <br />) +
cymelike +, paniclelike +, racemelike +  and spikelike +
5 cm50 mm <br />0.05 m <br /> (20 cm200 mm <br />0.2 m <br />) +
connate +  and free +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 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 +
4.5 cm45 mm <br />0.045 m <br /> (6 cm60 mm <br />0.06 m <br />) +
erect to deflexed +
0.5 cm5 mm <br />0.005 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
cylindric +  and urceolate +
accrescent +
fleshy +, indurate +  and membranous +
with extrafloral nectaries +  and not articulate +
4 cm40 mm <br />0.04 m <br /> (5 cm50 mm <br />0.05 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Flowering Mar–Oct. +
homostylous +  and 3-carpellate +
Leafl. W. Bot. +
, +  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 +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (?) +  and 0.03 cm0.3 mm <br />3.0e-4 m <br /> (?) +
chambered +  and solid +
Slender (?) +  and Stout (?) +
Eriogonum argillosum +
Eriogonum subg. Oregonium +
species +
emarginate +  and entire +
1/4 +  and 1/2 +
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 +
annual +, biennial +  and perennial +
floccose +  and glabrous +
synoecious +, monocarpic +, polycarpic +  and , +
3 +, 2 +  and 1 +