Eriogonum heermannii var. subspinosum

Reveal

Phytologia 86: 134. 2004.

Common names: Tabeau Peak wild buckwheat
Treatment appears in FNA Volume 5. Treatment on page 305. Mentioned on page 304, 306.

Shrubs, rounded, usually sparsely branched, 1–3 × 1.5–5 (–8) dm. Leaf-blades lanceolate to narrowly elliptic or spatulate, 0.5–1.5 × 0.2–0.8 cm, thinly tomentose to floccose abaxially. Inflorescences 3–7 (–10) × 3–10 (–12) cm; branches usually diffuse, with dichotomously arranged involucres, stoutish, round, faintly grooved, glabrous, spinose. Involucres campanulate, 2–3 × 3–4 mm. Flowers 2.5–4 mm; perianth yellowish white.


Phenology: Flowering Mar–May.
Habitat: Limestone flats, washes, and slopes, saltbush and blackbrush communities
Elevation: 1000-2500 m

Discussion

Variety subspinosum is known only from the southern end of the Beaver Dam Mountains in southern Washington County, Utah, and the eastern end of the Virgin Mountains and Virgin Narrows of Mohave County, Arizona. It approaches in habit the stoutly branched phase of var. argense known as var. subracemosum, but it lacks the papillate-scabrous condition. It also resembles var. sulcatum, but has only faintly grooved, rather than distinctly furrowed or deeply angled, inflorescence branches. It differs also in having the more open inflorescences of var. humilius. Both var. subspinosum and the subracemosum phase of var. argense have short, spinose lateral branches.

Selected References

None.

Lower Taxa

None.

"/2" 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."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.

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 +
Reveal +
deciduous +  and persistent +
stipelike +
Eriogonum geniculatum +
papillate +
awn-tipped +  and simple +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
tomentose +  and floccose or glabrous abaxially +
oblong;elliptic;spatulate;oblanceolate;oblong;elliptic;spatulate;oblanceolate;linear +
0.1 cm1 mm <br />0.001 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
not awn-tipped +
leaflike +  and semileaflike +
glandular +, pubescent +  and glabrous +
scale-like +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
angled to ridged +  and smooth +
spreading +  and erect +
scabrellous +
spreading +  and erect +
whorled +, opposite +  and alternate +
Tabeau Peak wild buckwheat +
Ariz. +  and Utah. +
1000-2500 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 +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 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 +
Limestone flats, washes, and slopes, saltbush and blackbrush communities +
reduced +
capitate +  and subcapitate +
7 cm70 mm <br />0.07 m <br /> (10 cm100 mm <br />0.1 m <br />) +
10 cm100 mm <br />0.1 m <br /> (12 cm120 mm <br />0.12 m <br />) +
dense +  and diffuse +
3 cm30 mm <br />0.03 m <br /> (7 cm70 mm <br />0.07 m <br />) +
cymelike +, paniclelike +, racemelike +  and spikelike +
3 cm30 mm <br />0.03 m <br /> (10 cm100 mm <br />0.1 m <br />) +
connate +  and free +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
floccose +  and glabrous +
campanulate +
nonmembranous +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
thinly tomentose +  and floccose +
lanceolate +  and narrowly elliptic or spatulate +
0.2cm;0.8cm +
in whorls +, opposite +, alternate +  and rosulate +
deciduous +
bractlike +
pubescent +  and glabrous +
not swollen +
orthotropous +
accrescent +
curved +  and straight +
erect to deflexed +
yellowish white +
cylindric +  and urceolate +
accrescent +
fleshy +, indurate +  and membranous +
with extrafloral nectaries +  and not articulate +
glabrous +  and floccose +
0.1 cm1 mm <br />0.001 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Flowering Mar–May. +
homostylous +  and 3-carpellate +
, +  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 +
erect +  and spreading +
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 +
chambered +  and solid +
slender +  and stout +
Eriogonum heermannii var. subspinosum +
Eriogonum heermannii +
variety +
emarginate +  and entire +
in proximal 1/2 +  and connate +
0 +  and 1/2 +
lobed +  and laciniate +
coriaceous +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
persistent +
membranous +
pubescent +  and glabrous +
grayish +  and greenish +
erect;spreading;erect;spreading +
floccose +  and glabrous +
synoecious +, monocarpic +, polycarpic +  and , +
3 +, 2 +  and 1 +