Burke: Erigeron subtrinervis vs. Erigeron piperianus

	Erigeron subtrinervis	Erigeron piperianus
	three-veined fleabane	Piper's fleabane
Habit	Perennial from a short, woody base, 1.5-8 dm. tall, the stems clustered, amply leafy, spreading-hairy throughout.	Perennial from a taproot and short, branched, woody base, the stem 3-10 cm. high and covered with short, stiff appressed hairs.
Leaves	Leaves triple-nerved, entire, the lower oblanceolate or spatulate, petiolate, mostly deciduous, the other becoming sessile but ample.	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 1-13 in a open inflorescence; involucre 6-9 mm. high; rays 65-150, blue or rarely white or pink, 9-18 mm. long and 1 mm. wide; pappus 20-30 bristles, a few of the outer ones shorter.	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 subtrinervis	Erigeron piperianus
Flowering time	July-September	May-June
Habitat	Moderately dry, open places at low to middle elevations.	Dry, open places, often in sandy soil among sagebrush.
Distribution	Occurring on both sides of the Cascades crest in Washington; British Columbia to Washington, 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. 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. piperianus, E. poliospermus, E. pumilus, E. salishii, E. speciosus, E. strigosus	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
Web links	Local floras: OR, WA Local Web sites: 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

three-veined fleabane

Piper's fleabane

Habit

Perennial from a short, woody base, 1.5-8 dm. tall, the stems clustered, amply leafy, spreading-hairy throughout.

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

Leaves

Leaves triple-nerved, entire, the lower oblanceolate or spatulate, petiolate, mostly deciduous, the other becoming sessile but ample.

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 1-13 in a open inflorescence;

involucre 6-9 mm. high;

rays 65-150, blue or rarely white or pink, 9-18 mm. long and 1 mm. wide;

pappus 20-30 bristles, a few of the outer ones shorter.

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.