Eriogonum pelinophilum

Reveal

Great Basin Naturalist 33: 120. 1973.

Common names: Clay-loving wild buckwheat
Treatment appears in FNA Volume 5. Treatment on page 252. Mentioned on page 240, 253, 270.
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Subshrubs, spreading, not scapose, 0.5–1 (–1.2) × 0.8–3 (–4) dm, floccose or glabrous, grayish. Stems spreading, without persistent leaf-bases, up to 1/3 height of plant; caudex stems absent or compact; aerial flowering-stems spreading to erect, slender, solid, not fistulose, 0.05–0.1 dm, thinly floccose or glabrous. Leaves cauline, 1 per node; petiole 0.05–0.1 cm, floccose; blade oblanceolate, 0.5–1.2 (–1.5) × 0.08–0.2 (–0.3) cm, densely white-tomentose abaxially, subglabrous or glabrous and green adaxially, margins tightly revolute. Inflorescences cymose, compact, 0.1–2 × 1–3 cm; branches dichotomous, thinly floccose or glabrous; bracts 3, scalelike, triangular, 0.5–1 mm. Peduncles absent or erect, 0.1–0.5 cm, floccose or glabrous. Involucres 1 per node, narrowly turbinate, (2–) 2.5–3.5 × 1–1.5 mm, floccose or glabrous; teeth 5, erect, 0.3–0.4 mm. Flowers (2.5–) 3–3.5 mm; perianth cream, glabrous; tepals connate proximal 1/2, essentially monomorphic, oblong; stamens slightly exserted, 2.5–4 mm; filaments sparsely pilose proximally. Achenes light-brown, 3–3.5 mm, glabrous. 2n = 40.


Phenology: Flowering May–Jul.
Habitat: Heavy clay flats and slopes, saltbush communities
Elevation: 1600-1900 m

Discussion

Of conservation concern.

Eriogonum pelinophilum is a federally listed endangered species with designated critical habitat. It is known only from Mancos Shale hills in Delta and Montrose counties. Much of the former habitat in the Montrose, Colorado, area has been destroyed since the species was listed in 1984. The type locality in Delta County was largely destroyed in 2001 by off-road vehicle activities in the designated critical habitat. A small population is preserved at the Fairview Natural Area east of Montrose.

Eriogonum pelinophilum is similar to E. clavellatum although the two are well-separated geographically. It is a smaller plant than E. clavellatum in habit. The flowers of E. clavellatum lack the pronounced, rounded, greenish-red to brownish-red base of the perianth seen in E. pelinophilum, and the tepals are distinctly dimorphic in E. clavellatum whereas they are essentially monomorphic in E. pelinophilum. Ants actively pollinate the flowers, being involved with both self- and cross-pollination. Some 50 additional visitors were found associated with the flowers, but none was confirmed as a pollinator (W. R. Bowlin et al. 1993).

The species is in the Center for Plant Conservation’s National Collection of Endangered Plants.

Lower Taxa

None.

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... more about "Eriogonum pelinophilum"
light-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 +
Undefined subg. Eucycla +
papillate +
awn-tipped +  and simple +
1.2 cm12 mm <br />0.012 m <br /> (1.5 cm15 mm <br />0.015 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 /> (1.2 cm12 mm <br />0.012 m <br />) +
glabrous +, subglabrous +  and white-tomentose +
oblanceolate +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
not awn-tipped +
leaflike +  and semileaflike +
glandular +, pubescent +  and glabrous +
triangular +  and scale-like +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
not brittle +
spreading +  and erect +
glabrous +  and floccose +
scabrellous +
ridged +, angled +  and round +
spreading +  and erect +
whorled +, opposite +  and alternate +
Clay-loving wild buckwheat +
1600-1900 m +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
unisexual +, , +  and bisexual +
not attenuate +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
decumbent to erect +  and prostrate +
not fistulose +
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 +
Heavy clay flats and slopes, saltbush communities +
reduced +
capitate +  and subcapitate +
dense +  and diffuse +
0.1 cm1 mm <br />0.001 m <br /> (2 cm20 mm <br />0.02 m <br />) +
cymelike +, paniclelike +, racemelike +  and spikelike +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 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 /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
glabrous +  and floccose +
nonmembranous +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
in whorls +, opposite +, alternate +  and rosulate +
persistent +
bractlike +
pubescent +  and glabrous +
lobed +, undulate +, crisped +, crenulate +  and entire +
not swollen +
orthotropous +
accrescent +
curved +  and straight +
glabrous;floccose +
erect to deflexed +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
cylindric +  and urceolate +
accrescent +
fleshy +, indurate +  and membranous +
with extrafloral nectaries +  and not articulate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Flowering May–Jul. +
homostylous +  and 3-carpellate +
Great Basin Naturalist +
bowlin1993a +
, +  and solid +
slender;stout +
persistent +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 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 +
chambered +  and solid +
slender +  and stout +
Eriogonum pelinophilum +
Eriogonum subg. Eucycla +
species +
emarginate +  and entire +
0 +  and 1/2 +
coriaceous +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
persistent +
membranous +
pubescent +  and glabrous +
glabrous +  and floccose +
synoecious +, monocarpic +, polycarpic +  and , +
3 +, 2 +  and 1 +