Eriogonum umbellatum var. stragulum

Reveal

Phytologia 86: 156. 2004.

Common names: Spreading sulphur flower
Treatment appears in FNA Volume 5. Treatment on page 340. Mentioned on page 338.

Herbs, spreading mats, 1–3.5 (–4) × 2.5–10 (–12) dm. Aerial flowering-stems erect, 1–3 dm, thinly floccose, without one or more leaflike bracts ca. midlength. Leaves in loose rosettes; blade broadly elliptic to ovate, (0.8–) 2–3 (–3.5) × (0.7–) 1–2 (–2.5) cm, thinly tomentose to sparsely floccose abaxially, thinly floccose or glabrous and green adaxially, margins plane. Inflorescences umbellate; branches (1–) 2.5–5 (–8) cm, without a whorl of bracts ca. midlength; involucral tubes 2–3 mm, lobes 3–5 mm. Flowers 4–7 (–8) mm; perianth bright-yellow. 2n = 80.


Phenology: Flowering May–Sep.
Habitat: Sandy to gravelly or occasionally rocky flats and slopes, mixed grassland and sagebrush communities, juniper and montane conifer woodlands
Elevation: 1400-2500 m

Discussion

Variety stragulum is the common expression of the species across southern Idaho (Bannock, Boise, Camas, Custer, Elmore, Gooding, Twin Falls, and Valley counties), mainly in the foothills and mountains adjacent to the Snake River Plains. It occurs also just to the east in Teton County, Wyoming. A collection from extreme northeastern Elko County, Nevada (Morefield & Price 5566, NESH, NY, RENO) with much shorter leaves and inflorescence branches is tentatively included. The variety forms large, spreading mats with largish leaves in rather loose rosettes. It is often found growing intermixed with E. heracleoides. Spreading sulphur flower is worthy of cultivation.

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."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 +
James L. Reveal +
Reveal +
deciduous +  and persistent +
stipelike +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
awn-tipped +  and simple +
3 cm30 mm <br />0.03 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
2 cm20 mm <br />0.02 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
thinly tomentose +  and sparsely floccose abaxially +
broadly elliptic;ovate +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
not awn-tipped +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
midlength +
glandular +, pubescent +  and glabrous +
3;several +
scale-like +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
grooved +, disarticulating +  and dichotomous +
5 cm50 mm <br />0.05 m <br /> (8 cm80 mm <br />0.08 m <br />) +
not brittle +
tomentose +  and floccose or glabrous +
scabrellous +
2.5 cm25 mm <br />0.025 m <br /> (5 cm50 mm <br />0.05 m <br />) +
spreading +  and erect +
whorled +, opposite +  and alternate +
Spreading sulphur flower +
Idaho +, Nev. +  and Wyo. +
1400-2500 m +
curved +  and straight +
0.7 cm7 mm <br />0.007 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
unisexual +  and bisexual +
attenuate +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 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 +
Sandy to gravelly or occasionally rocky flats and slopes, mixed grassland and sagebrush communities, juniper and montane conifer woodlands +
capitate +  and subcapitate +
3 cm30 mm <br />0.03 m <br /> (25 cm250 mm <br />0.25 m <br />) +
cymelike +, paniclelike +, racemelike +  and spikelike +
2 cm20 mm <br />0.02 m <br /> (18 cm180 mm <br />0.18 m <br />) +
connate +  and free +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
tomentose +  and thinly floccose or glabrous +
turbinate +  and campanulate +
nonmembranous +
0.15 cm1.5 mm <br />0.0015 m <br /> (1 cm10 mm <br />0.01 m <br />) +
in whorls +, opposite +, alternate +  and rosulate +
persistent +
cauline +  and basal +
bractlike +
pubescent +  and glabrous +
not swollen +
orthotropous +
accrescent +
curved +  and straight +
erect to deflexed +
bright-yellow +
cylindric +  and urceolate +
accrescent +
fleshy +, indurate +  and membranous +
with extrafloral nectaries +  and not articulate +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
mostly tomentose +  and floccose or glabrous +
0.1 cm1 mm <br />0.001 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Flowering May–Sep. +
homostylous +  and 3-carpellate +
0.3 cm3 mm <br />0.003 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
, +  and solid +
slender;stout +
persistent +
Illustrated +  and Endemic +
0.2 cm2 mm <br />0.002 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
decumbent to erect +  and prostrate +
prostrate +  and erect +
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 umbellatum var. stragulum +
Eriogonum umbellatum +
variety +
emarginate +  and entire +
1/4 +  and 1/3 +
usually spatulate +  and obovate +
coriaceous +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
involucral +
persistent +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
membranous +
pubescent +  and glabrous +
sericeous +, lanate +  and tomentose floccose or glabrous +
dioecious +, polygamodioecious +, synoecious +  and polycarpic +
annual +, biennial +  and perennial +
tomentose +  and glabrous +
midlength +
3 +, 2 +  and 1 +