Burke: Erigeron karvinskianus vs. Erigeron howellii

	Erigeron karvinskianus	Erigeron howellii
	Erigeron karvinskianus	Howell's fleabane
Habit		Rhizomatous perennial, the stems 2-5 dm. tall, with a few woolly hairs under the heads.
Leaves		Leaves alternate, thin, glabrous, the lower ones with an ellipitical blade 2-8 cm. long and 1.5-4.5 cm. wide, abruptly contracted to the 2-12 cm. petiole; middle cauline leaves ovate to cordate, strongly clasping at the base; upper leaves similar but smaller.
Flowers		Heads solitary; disk 12-20 mm. wide; involucre bracts loose, equal, glandular, somewhat herbaceous; rays 30-50, white, 13-25 mm. long and 2-4 mm. wide; disk corollas yellow, 4-5 mm. long, the lobes flaring; pappus simple, of 20-30 capillary bristles.
Fruits		Achenes asymmetrically 5-nerved.

	Erigeron karvinskianus	Erigeron howellii
Flowering time		April-June
Habitat		Moist, rocky places in the lowlands.
Distribution	[WildflowerSearch map] [BONAP county map]	Known only from Skamania County in Washington; Skamania County, WA to Clackamas and Multnomah counties in Oregon. [WildflowerSearch map] [BONAP county map]
Origin	Introduced	Native
Conservation status	Not of concern	Threatened in Washington (WANHP)
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. 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. 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
Web links	Local floras: CA, OR, WA Local Web sites: CalFlora, CalPhotos, 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	Local floras: OR, 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 howellii

Erigeron karvinskianus

Howell's fleabane

Habit

Rhizomatous perennial, the stems 2-5 dm. tall, with a few woolly hairs under the heads.

Leaves

Leaves alternate, thin, glabrous, the lower ones with an ellipitical blade 2-8 cm. long and 1.5-4.5 cm. wide, abruptly contracted to the 2-12 cm. petiole; middle cauline leaves ovate to cordate, strongly clasping at the base; upper leaves similar but smaller.

Flowers

Heads solitary; disk 12-20 mm. wide;

involucre bracts loose, equal, glandular, somewhat herbaceous;

rays 30-50, white, 13-25 mm. long and 2-4 mm. wide; disk corollas yellow, 4-5 mm. long, the lobes flaring;

pappus simple, of 20-30 capillary bristles.

Fruits

Achenes asymmetrically 5-nerved.