Eriogonum nudum var. nudum

Common names: Naked wild buckwheat
IllustratedEndemic
Synonyms: Eriogonum latifolium var. parvulum
Treatment appears in FNA Volume 5. Treatment on page 310. Mentioned on page 311, 312.

Plants 3–10 dm. Aerial flowering-stems not fistulose, (1.5–) 2–4 dm, glabrous. Leaves basal; blade 1–5 × 0.5–2 cm, tomentose abaxially, thinly floccose or glabrous adaxially, margins plane. Inflorescences cymose, 20–50 cm; branches glabrous. Involucres 2–5 per cluster, 3–5 mm, glabrous or sparsely pubescent. Flowers 2–3 mm; perianth white, rarely yellow, glabrous. 2n = 40.


Phenology: Flowering Jun–Sep.
Habitat: Sandy to gravelly flats, slopes, banks, and washes, mixed grassland and chaparral communities, oak and conifer woodlands
Elevation: 10-2100(-2400) m

Discussion

Variety nudum is the low-elevation tetraploid expression of the species, found mainly in the Coast Ranges and interior valleys from southern Washington through Oregon to California. It is replaced by var. deductum at higher elevations in the Sierra Nevada. Yellow-flowered populations occur rarely in the Siskiyou Mountains of California and Oregon.

Selected References

None.

Lower Taxa

None.

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light-brown;brown +
included +  and exserted +
3-gonous +
usually red +  and cream or yellow +
oblong +  and ellipsoid or oval +
acute;obtuse or rounded +
James L. Reveal +
Douglas ex Bentham +
deciduous +  and persistent +
stipelike +
Undefined subg. Eucycla +
papillate +
awn-tipped +  and simple +
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
1 cm10 mm <br />0.01 m <br /> (5 cm50 mm <br />0.05 m <br />) +
glabrous +, floccose +  and tomentose +
oblanceolate;elliptic or ovate +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
not awn-tipped +
leaflike +  and semileaflike +
0.3 cm3 mm <br />0.003 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 /> (0.3 cm3 mm <br />0.003 m <br />) +
not brittle +
spreading +  and erect +
scabrellous +
ridged +, angled +  and round +
spreading +  and erect +
whorled +, opposite +  and alternate +
Naked wild buckwheat +
Calif. +, Oreg. +  and Wash. +
10-2100(-2400) m +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
unisexual +, , +  and bisexual +
not attenuate +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
hollow +  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, slopes, banks, and washes, mixed grassland and chaparral communities, oak and conifer woodlands +
reduced +
capitate +  and subcapitate +
100 cm1,000 mm <br />1 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
40 cm400 mm <br />0.4 m <br /> (80 cm800 mm <br />0.8 m <br />) +
dense +  and diffuse +
2 cm20 mm <br />0.02 m <br /> (100 cm1,000 mm <br />1 m <br />) +
cymelike +, paniclelike +, racemelike +  and spikelike +
20 cm200 mm <br />0.2 m <br /> (50 cm500 mm <br />0.5 m <br />) +
2 cm20 mm <br />0.02 m <br /> (40 cm400 mm <br />0.4 m <br />) +
connate +  and free +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
pubescent +  and glabrous +
turbinate +  and turbinate-campanulate +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
nonmembranous +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 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 glabrous +
1 cm10 mm <br />0.01 m <br /> (10 cm100 mm <br />0.1 m <br />) +
Flowering Jun–Sep. +
homostylous +  and 3-carpellate +
Trans. Linn. Soc. London +
, +  and solid +
slender;stout +
persistent +
Illustrated +  and Endemic +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
decumbent to erect +  and prostrate +
spreading +  and erect +
glandular +, pubescent +  and glabrous +
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 +
Eriogonum latifolium var. parvulum +
chambered +  and solid +
slender +  and stout +
Eriogonum nudum var. nudum +
Eriogonum nudum +
variety +
emarginate +  and entire +
0 +  and 1/2 +
oblong +  and obovate +
coriaceous +
spreading +  and erect +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
persistent +
membranous +
pubescent +  and glabrous +
grayish +  and greenish +
floccose +  and tomentose +
synoecious +, monocarpic +, polycarpic +  and , +
3 +, 2 +  and 1 +