Eriogonum arizonicum

S. Stokes ex M. E. Jones

Contr. W. Bot. 11: 16. 1903.

Common names: Arizona wild buckwheat
Treatment appears in FNA Volume 5. Treatment on page 392. Mentioned on page 381.

Herbs, erect to slightly spreading, perennial, 2.5–5 (–6) × 3–8 dm, glabrous, glaucous. Stems: caudex compact to spreading; aerial flowering-stems erect, solid, not fistulose, 1–3 dm, glabrous or thinly floccose. Leaves basal, sheathing up stems 0.5–15 cm; petiole (0.5–) 1–2.5 (–4) cm, densely pilose; blade ovate to rounded, (0.5–) 1–2 (–2.3) × (0.5–) 1–2 (–2.5) cm, usually sparsely pilose and grayish to whitish on both surfaces, margins undulate. Inflorescences narrowly cymose, open, 10–35 (–40) × 5–20 cm; branches not fistulose, glabrous, glaucous; bracts 3, scalelike, 0.3–0.8 (–1) × 0.2–0.8 mm. Peduncles erect, straight, capillary to slender, 0.5–2.5 (–3) cm, glabrous. Involucres turbinate, (0.8–) 1–1.6 (–2) × (0.8–) 1–1.2 (–1.5) mm, glabrous; teeth 5, erect, 0.3–0.8 mm. Flowers (1.2–) 1.5–2.5 mm; perianth yellowish to yellowish red or reddish with greenish or reddish to reddish-brown midribs, glabrous; tepals dimorphic, those of outer whorl obovate with slightly enlarged, auriculate bases, those of inner whorl obovate; stamens included, 1–1.5 mm; filaments sparsely pilose proximally or glabrous. Achenes dark-brown, 3-gonous, 1.5–2 mm, glabrous.


Phenology: Flowering Mar–Jun and Aug–Nov.
Habitat: Sandy flats and gravelly washes, mixed grassland, saltbush, creosote bush, and mesquite communities
Elevation: 600-1100 m

Discussion

Of conservation concern.

Eriogonum arizonicum is widely distributed in scattered and isolated populations across central Arizona from extreme eastern Mohave and southern Yavapai counties through northern Maricopa County to southern Gila and northern Pinal counties. It rarely is common in any location. Limited field observations suggest that some individuals in a population may be first-year flowering perennials.

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 arizonicum"
included +  and exserted +
3-gonous +
usually red +  and cream or yellow +
oblong +  and ellipsoid or oval +
James L. Reveal +
S. Stokes ex M. E. Jones +
deciduous +  and persistent +
auriculate +
enlarged +
Eriogonum sect. Ganysma +
awn-tipped +  and simple +
2 cm20 mm <br />0.02 m <br /> (2.3 cm23 mm <br />0.023 m <br />) +
2 cm20 mm <br />0.02 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
grayish +  and whitish +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
ovate;rounded +
1cm;2cm +
not awn-tipped +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
glandular +, pubescent +  and glabrous +
scale-like +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
grooved +, disarticulating +  and dichotomous +
not brittle +
glaucous +  and glabrous +
scabrellous +
not fistulose +
spreading +  and erect +
whorled +, opposite +  and alternate +
Arizona wild buckwheat +
600-1100 m +
glabrous +  and pilose +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
unisexual +, , +  and bisexual +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 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 +
Sandy flats and gravelly washes, mixed grassland, saltbush, creosote bush, and mesquite communities +
open +  and cymose +
capitate +  and subcapitate +
racemose +, paniculate +  and cymose-paniculate +
35 cm350 mm <br />0.35 m <br /> (40 cm400 mm <br />0.4 m <br />) +
cymelike +, paniclelike +, racemelike +  and spikelike +
connate +  and free +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
nonmembranous +
0.1 cm1 mm <br />0.001 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
in whorls +, opposite +, alternate +  and rosulate +
marcescent +
persistent +
bractlike +
pubescent +  and glabrous +
undulate +
reddish +  and reddish-brown +
not swollen +
orthotropous +
accrescent +
2.5 cm25 mm <br />0.025 m <br /> (3 cm30 mm <br />0.03 m <br />) +
erect to deflexed +
capillary +
0.5 cm5 mm <br />0.005 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
cylindric +  and urceolate +
accrescent +
fleshy +, indurate +  and membranous +
with extrafloral nectaries +  and not articulate +
2.5 cm25 mm <br />0.025 m <br /> (4 cm40 mm <br />0.04 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
Flowering Mar–Jun and Aug–Nov. +
homostylous +  and 3-carpellate +
Contr. W. Bot. +
, +  and solid +
slender;stout +
persistent +
decumbent to erect +  and prostrate +
spreading +  and erect +
0.5 cm5 mm <br />0.005 m <br /> (15 cm150 mm <br />0.15 m <br />) +
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 arizonicum +
Eriogonum subg. Ganysma +
species +
emarginate +  and entire +
1/5 +  and 1/2 +
lobed +  and laciniate +
coriaceous +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
persistent +
membranous +
pubescent +  and glabrous +
annual +  and perennial +
erect;slightly spreading +
glaucous +  and glabrous +
synoecious +, monocarpic +, polycarpic +  and , +
3 +, 2 +  and 1 +