Eriogonum crosbyae

Reveal

Brittonia 33: 442, fig. 1. 1981.

Common names: Crosby’s wild buckwheat
EndemicConservation concern
Synonyms: Eriogonum capistratum Reveal Eriogonum capistratum var. muhlickii Reveal Eriogonum capistratum var. welshii Reveal Eriogonum meledonum Reveal Eriogonum ochrocephalum var. alexanderae Reveal Eriogonum verrucosum
Treatment appears in FNA Volume 5. Treatment on page 277. Mentioned on page 230, 234, 241, 278.

Herbs, matted, scapose, 0.05–1.5 (–2) × (0.1–) 1–3 dm, floccose to tomentose or glabrous, sometimes glandular, greenish or grayish. Stems matted, with persistent leaf-bases, up to 1/5 height of plant; caudex stems matted; aerial flowering-stems scapelike, weakly erect to erect, slender, solid, not fistulose, 0.02–1.5 (–1.8) dm, floccose to tomentose or glabrous, occasionally also or only sparsely to densely glandular. Leaves basal, fasciculate in terminal tufts; petiole 0.2–3 (–3.5) cm, tomentose, infrequently glandular; blade oblanceolate to spatulate or elliptic to obovate or ovate, (0.5–) 1–2 (–3) × 0.2–1 (–1.5) cm, densely white or grayish-tomentose on both surfaces, sometimes less and greenish white adaxially, margins plane. Inflorescences capitate, 0.7–1.5 cm; branches absent; bracts 3, narrowly triangular to triangular, scalelike, 1–3 mm. Peduncles absent. Involucres (3–) 5–8 per cluster, turbinate to campanulate, (1.5–) 2–5 (–5.5) × 2–4 (–4.5) mm, rigid or membranous, tomentose to floccose, occasionally glabrous except for floccose teeth, rarely sparsely pilose and glandular; teeth 5–7, erect to spreading or reflexed, 0.5–1.5 mm. Flowers 1.5–3.5 (–4) mm, glabrous or occasionally minutely glandular, pustulose in some; perianth yellow to pale-yellow or, rarely, cream; tepals connate proximal 1/4–1/3, monomorphic, oblong to oblong-obovate; stamens exserted, 1.5–4 mm; filaments glabrous or sparsely pilose proximally. Achenes light-brown, 2–4 mm, glabrous or sometimes with minute bristles on beak. 2n = 40.


Phenology: Flowering May–Aug.
Habitat: White tuffaceous shale volcanic outcrops, metamorphic rock outcrops, or basaltic or granitic sandy flats, washes, slopes, and ridges, saltbush and sagebrush or high-elevation sagebrush to alpine tundra communities, juniper or montane conifer woodlands
Elevation: (1200-)1400-3100

Discussion

Eriogonum crosbyae, as now defined, is widely scattered in the valley bottoms and foothills, and atop several mountain ranges of central Idaho (Blaine, Butte, Camas, Custer, and Lemhi counties) and in western Montana (Deer Lodge and Ravalli counties). It is disjunct to southwestern Idaho (Owyhee Mountains, Owyhee County), southeastern Oregon (Guano and Coleman valleys, Harney County, and Fish Fin Rim, Lake County), and in northwestern Nevada (Washoe and Humboldt counties south through Douglas, Lyon, and Pershing counties to Mineral County). It also occus in the Marys River Peak area of Elko County, Nevada.

The species may be subdivided into four phases, for which names are available. The vast majority of populations have bright yellow flowers with pustulose bases and midveins. The pustulose condition may also be observed in Eriogonum chrysops (on pale greenish-yellow flowers) and in E. mancum (with cream-colored flowers). Populations with pale yellow flowers here assigned to E. crosbyae occur in the mountains near Mackay, Idaho, and cream-colored flowers are found near Challis and around Salmon, both well outside the known ranges of E. chrysops and E. mancum. Final resolution of the taxonomy of this group awaits further study.

Selected References

None.

Lower Taxa

None.

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... more about "Eriogonum crosbyae"
light-brown +
included +  and exserted +
sometimes +  and glabrous +
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 +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
greenish white +  and white +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
grayish-tomentose +
oblanceolate;spatulate or elliptic +
0.2 cm2 mm <br />0.002 m <br /> (1 cm10 mm <br />0.01 m <br />) +
not awn-tipped +
leaflike +  and semileaflike +
glandular +, pubescent +  and glabrous +
scale-like +, narrowly triangular +  and triangular +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
grooved +, branched +  and open +
not brittle +
spreading +  and erect +
tomentose +  and floccose or glabrous occasionally lanate or glandular +
scabrellous +
ridged +, angled +  and round +
spreading +  and erect +
whorled +, opposite +  and alternate +
Crosby’s wild buckwheat +
Idaho +, Mont. +, Nev. +  and Oreg. +
(1200-)1400-3100 +
pilose +  and glabrous +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
glandular +  and glabrous +
pustulose +
unisexual +, , +  and bisexual +
not attenuate +
0.15 cm1.5 mm <br />0.0015 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 +
White tuffaceous shale volcanic outcrops, metamorphic rock outcrops, or basaltic or granitic sandy flats, washes, slopes, and ridges, saltbush and sagebrush or high-elevation sagebrush to alpine tundra communities, juniper or montane conifer woodlands +
reduced +
open +, virgate +, umbellate +, cymose-umbellate +  and cymose +
dense +  and diffuse +
cymelike +, paniclelike +, racemelike +  and spikelike +
0.7 cm7 mm <br />0.007 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
connate +  and free +
narrowly turbinate +  and campanulate +
nonmembranous +
in whorls +, opposite +, alternate +  and rosulate +
persistent +
bractlike +
pubescent +  and glabrous +
not swollen +
orthotropous +
accrescent +
curved +  and straight +
erect to deflexed +
cream;,;yellow;pale-yellow +
glabrous +, pubescent +  and glandular +
cylindric +  and urceolate +
accrescent +
fleshy +, indurate +  and membranous +
with extrafloral nectaries +  and not articulate +
3 cm30 mm <br />0.03 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Flowering May–Aug. +
homostylous +  and 3-carpellate +
, +  and solid +
slender;stout +
persistent +
Endemic +  and Conservation concern +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
decumbent to erect +  and prostrate +
erect +, decumbent +  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 +
Eriogonum capistratum +, Eriogonum capistratum var. muhlickii +, Eriogonum capistratum var. welshii +, Eriogonum meledonum +, Eriogonum ochrocephalum var. alexanderae +  and Eriogonum verrucosum +
chambered +  and solid +
slender +  and stout +
Eriogonum crosbyae +
Eriogonum subg. Eucycla +
species +
emarginate +  and entire +
0 +  and 1/2 +
1/4 +  and 1/3 +
oblong +  and oblong-obovate +
coriaceous +
0.5 cm5 mm <br />0.005 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
erect +  and spreading or reflexed +
floccose;glabrous;tomentose;floccose +
turbinate +  and campanulate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
persistent +
membranous +
pubescent +  and glabrous +
grayish +  and greenish +
herb +  and matted +
floccose +  and tomentose or glabrous +
synoecious +, monocarpic +, polycarpic +  and , +
3 +, 2 +  and 1 +