Burke: Erigeron eatonii vs. Erigeron piperianus

	Erigeron eatonii	Erigeron piperianus
	Eaton's fleabane	Piper's fleabane
Habit	Perennial from a tap-root, 5-30 cm. tall, the stems decumbent and purplish at the base, with appressed hairs.	Perennial from a taproot and short, branched, woody base, the stem 3-10 cm. high and covered with short, stiff appressed hairs.
Leaves	Basal leaves tufted, narrow, acute, gradually tapering to the petiole; cauline leaves several, conspicuously reduced.	Leaves mostly basal or lower-cauline, linear, lax and curved, up to 4 cm. long and 1.5 mm. wide, with short, stiff, sharp-pointed hairs on the margins and appressed- hairy on the surfaces, the lower leaves with conspicuously enlarged, hardened, whitish bases.
Flowers	Heads solitary or up to 7 in an open inflorescence; involucres 5-7 mm. high; rays 20-50, pistillate, white, 5-10 mm. long and 1-3 mm. wide; disk corollas 3.5-5 mm. long, yellow; inner pappus bristles 15-20, outer obscure.	Heads solitary or few, small, the disk 5-10 mm. wide; involucre 3-5 mm. high, covered with long, white, stiff, spreading hairs; rays 25-40, pistillate, yellow, 4-9 mm. long and 1.0-1.8 mm. wide; disk corollas 2.8-4.2 mm. long, yellow; pappus of 15-25 capillary bristles.

	Erigeron eatonii	Erigeron piperianus
Flowering time	May-July	May-June
Habitat	Grasslands, sagebrush, dry slopes, and forest openings at low to middle elevations.	Dry, open places, often in sandy soil among sagebrush.
Distribution	Occurring east of the Cascades crest in central and southeastern Washington; central Washington to California, east to the Rocky Mountains. [WildflowerSearch map] [BONAP county map]	Endemic to Washington, where occurring east of the Cascades crest from north-central to south-central Washington. [WildflowerSearch map] [BONAP county map]
Origin	Native	Native
Conservation status	Not of concern	Not of concern
Sibling taxa	E. acris, E. aliceae, E. annuus, E. aureus, E. basalticus, E. bloomeri, E. caespitosus, E. chrysopsidis, E. compositus, E. corymbosus, E. davisii, E. disparipilus, E. divergens, E. elatus, E. filifolius, E. flettii, E. glacialis, E. howellii, E. inornatus, E. karvinskianus, E. leibergii, E. linearis, E. lonchophyllus, E. nivalis, E. oreganus, E. peregrinus, E. philadelphicus, E. piperianus, E. poliospermus, E. pumilus, E. salishii, E. speciosus, E. strigosus, E. subtrinervis	E. acris, E. aliceae, E. annuus, E. aureus, E. basalticus, E. bloomeri, E. caespitosus, E. chrysopsidis, E. compositus, E. corymbosus, E. davisii, E. disparipilus, E. divergens, E. eatonii, E. elatus, E. filifolius, E. flettii, E. glacialis, E. howellii, E. inornatus, E. karvinskianus, E. leibergii, E. linearis, E. lonchophyllus, E. nivalis, E. oreganus, E. peregrinus, E. philadelphicus, E. poliospermus, E. pumilus, E. salishii, E. speciosus, E. strigosus, E. subtrinervis
Subordinate taxa	E. eatonii var. villosus
Web links	Local floras: CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria, Turner Photog. WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: WA Local Web sites: Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Erigeron piperianus

Eaton's fleabane

Piper's fleabane

Habit

Perennial from a tap-root, 5-30 cm. tall, the stems decumbent and purplish at the base, with appressed hairs.

Perennial from a taproot and short, branched, woody base, the stem 3-10 cm. high and covered with short, stiff appressed hairs.

Leaves

Basal leaves tufted, narrow, acute, gradually tapering to the petiole;

cauline leaves several, conspicuously reduced.

Leaves mostly basal or lower-cauline, linear, lax and curved, up to 4 cm. long and 1.5 mm. wide, with short, stiff, sharp-pointed hairs on the margins and appressed- hairy on the surfaces, the lower leaves with conspicuously enlarged, hardened, whitish bases.

Flowers

Heads solitary or up to 7 in an open inflorescence;

involucres 5-7 mm. high;

rays 20-50, pistillate, white, 5-10 mm. long and 1-3 mm. wide; disk corollas 3.5-5 mm. long, yellow;

inner pappus bristles 15-20, outer obscure.

Heads solitary or few, small, the disk 5-10 mm. wide;

involucre 3-5 mm. high, covered with long, white, stiff, spreading hairs;

rays 25-40, pistillate, yellow, 4-9 mm. long and 1.0-1.8 mm. wide; disk corollas 2.8-4.2 mm. long, yellow;

pappus of 15-25 capillary bristles.