East of the Cascade Mts.
Moving Polemonium, Low Jacob's-ladder, Showy Jacob's-ladder: Polemonium californicum (Synonyms: Polemonium columbianum, Polemonium pulcherrimum ssp. tricolor, Polemonium pucherrimum var. calycinum) -
Elegant Jacob's-ladder, Elegant Jacob's Ladder, Elegant Polemonium, Sky Pilot: Polemonium elegans - Corolla funnel-shaped, 12-15 mm long, the lobes shorter than the tube. Leaflets opposite or offset and undivided. Plants densely glandular-haired.
Annual Polemonium, Annual Jacob's-ladder, Littlebells Polemonium: Polemonium micranthum (Synonym: Polemoniella micrantha) - Corolla less than 6 mm long. Flowers solitary in leaf axils.
Western Polemonium: Polemonium occidentale (Synonyms: Polemonium intermedium, Polemonium occidentale ssp. occidentale) - Corolla bell-shaped, about as wide as long, the lobes about as long as the tube. Stems solitary, erect and from 40-100 cm high. Plants of wet meadows.
Washington Polemonium, Washington Jacob's-ladder: Polemonium pectinatum -
Showy Polemonium, Showy Jacob's-ladder, Jacob's-ladder, Skunk-leaved Polemonium: Polemonium pulcherrimum ssp. pulcherrimum (Synonyms: Polemonium berryi, Polemonium haydenii, Polemonium pilosum, Polemonium pulcherrimum var. pilosum, Polemonium pulcherrimum var. pulcherrimum, Polemonium shastense) - Corolla bell-shaped, about as wide as long, the lobes about as long as the tube. Corolla less than 15 mm long. Plants with several lax stems up to 30 cm high. Plants often glandular in the inflorescence, more glabrous below. Plants of dry, open forests or dry, open, rocky places.
Sky Pilot, Skunkweed, Sticky Polemonium: Polemonium viscosum (Synonyms: Polemonium viscosum ssp. genuinum, Polemonium viscosum ssp. lemmonii) - Corolla funnel-shaped, 17-25 mm long, lobes shorter than the tube. Corolla longer than 15 mm long. Plants densely glandular-haired. Leaflets often deeply 2-5 cleft and often appearing whorled.