Eriogonum hylophilum

Reveal & Brotherson

Great Basin Naturalist 27: 190, fig. 2. 1968.

Common names: Gate Canyon wild buckwheat
EndemicConservation concern
Synonyms: Eriogonum corymbosum var. hylophilum (Reveal & Brotherson) S. L. Welsh
Treatment appears in FNA Volume 5. Treatment on page 259. Mentioned on page 232, 260.

Subshrubs, spreading, not scapose, 2.5–4 × 3–5 dm, tomentose, greenish. Stems spreading, often with persistent leaf-bases, up to 1/4 or more height of plant; caudex stems somewhat matted; aerial flowering-stems erect or nearly so, somewhat stout, solid, not fistulose, 0.5–1.5 dm, tomentose. Leaves cauline and sheathing proximal 1/3 of stem, 1 per node; petiole 0.5–1 (–1.8) cm, tomentose; blade linear-lanceolate to lanceolate, 3.5–7 (–9) × 0.3–0.6 (–0.8) cm, densely white-tomentose abaxially, less so and greenish adaxially, margins plane and slightly revolute, rarely crenulate. Inflorescences cymose, open, 3–8 × 3–10 cm; branches dichotomous, tomentose; bracts 3, scalelike, triangular, and 2–3 mm, or leaflike, 1–2 cm, and similar to leaf-blades. Peduncles absent. Involucres 1 per node or 2–3 per cluster, turbinate, 3.5–4 × 2.5–3 mm; teeth 5–6, erect, 0.5–1 mm. Flowers (3–) 3.5–4 (–4.5) mm; perianth white, glabrous; tepals connate proximal 1/4, slightly dimorphic, those of outer whorl spatulate, 1-3–1.7 (–2) mm wide, those of inner whorl oblanceolate, 0.6–0.9 (–1.2) mm wide; stamens included, 2–3 (–3.5) mm; filaments pilose proximally. Achenes brown, 2.5–3 mm, glabrous except for slightly papillate beak.


Phenology: Flowering Jul–Sep.
Habitat: Gravelly slopes, sagebrush communities, pinyon-juniper or montane conifer woodlands
Elevation: 2200-2600 m

Discussion

Of conservation concern.

Eriogonum hylophilum is known from a few, scattered locations in the Gate Canyon area and just west along the rim of the Badland Cliffs in Duchesne County. The species is closely related to E. corymbosum and approaches the minor segregate of the latter known as var. erectum. It is possible that the Gate Canyon wild buckwheat has an evolutionary history involving that expression of E. corymbosum and the white- to cream-colored flower expression of E. brevicaule var. laxifolium. If so, E. hylophilum is a stable and persistent taxon of hybrid origin.

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.

... more about "Eriogonum hylophilum"
included +  and exserted +
3-gonous +
usually red +  and cream or yellow +
oblong +  and ellipsoid or oval +
acute;obtuse or rounded +
James L. Reveal +
Reveal & Brotherson +
deciduous +  and persistent +
stipelike +
Undefined subg. Eucycla +
papillate +
awn-tipped +  and simple +
7 cm70 mm <br />0.07 m <br /> (9 cm90 mm <br />0.09 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
3.5 cm35 mm <br />0.035 m <br /> (7 cm70 mm <br />0.07 m <br />) +
white-tomentose +
linear-lanceolate;lanceolate +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
not awn-tipped +
glandular +, pubescent +  and glabrous +
triangular +  and scale-like +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
not brittle +
spreading +  and erect +
scabrellous +
ridged +, angled +  and round +
spreading +  and erect +
whorled +, opposite +  and alternate +
Gate Canyon wild buckwheat +
2200-2600 m +
0.4 cm4 mm <br />0.004 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
unisexual +, , +  and bisexual +
not attenuate +
0.35 cm3.5 mm <br />0.0035 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 +
Gravelly slopes, sagebrush communities, pinyon-juniper or montane conifer woodlands +
reduced +
open +  and cymose +
capitate +  and subcapitate +
dense +  and diffuse +
3 cm30 mm <br />0.03 m <br /> (8 cm80 mm <br />0.08 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 +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
nonmembranous +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
in whorls +, opposite +, alternate +  and rosulate +
persistent +
proximal +  and cauline +
bractlike +
pubescent +  and glabrous +
crenulate +  and plane +
not swollen +
orthotropous +
accrescent +
curved +  and straight +
erect to deflexed +
cylindric +  and urceolate +
accrescent +
fleshy +, indurate +  and membranous +
with extrafloral nectaries +  and not articulate +
1 cm10 mm <br />0.01 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Flowering Jul–Sep. +
homostylous +  and 3-carpellate +
Great Basin Naturalist +
, +  and solid +
slender;stout +
persistent +
Endemic +  and Conservation concern +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
decumbent to erect +  and prostrate +
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 corymbosum var. hylophilum +
chambered +  and solid +
slender +  and stout +
Eriogonum hylophilum +
Eriogonum subg. Eucycla +
species +
emarginate +  and entire +
in proximal 1/2 +  and connate +
0 +  and 1/2 +
lobed +  and laciniate +
coriaceous +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
persistent +
membranous +
pubescent +  and glabrous +
plant +  and subshrub +
synoecious +, monocarpic +, polycarpic +  and , +
3 +, 2 +  and 1 +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +