Cusick's Popcornflower, Matted Popcornflower: Plagiobothrys cusickii (Synonyms: Allocarya cusickii, Plagiobothrys scouleri var. cusickii, Plagiobothrys scouleri var. penicillatus) -
Fragrant Allocarya, Fragrant Popcornflower, Fragrant Popcorn Flower: Plagiobothrys figuratus var. figuratus (Synonyms: Allocarya figurata, Plagiobothrys figuratus, Plagiobothrys figuratus ssp. figuratus, Plagiobothrys hirtus var. figuratus) - At least some of the lower stem leaves are opposite. Corolla limb 5-10 mm wide. Plants erect or ascending.
Eastside Popcornflower, Harsh Popcornflower, Harsh Popcorn-flower: Plagiobothrys hispidulus (Synonyms: Allocarya hispidula, Plagiobothrys scouleri var. hispidulus, Plagiobothrys scouleri var. penicillatus) -
Finebranched Popcornflower, Slender-branch Plagiobothrys, Slender-branched Popcorn-flower: Plagiobothrys leptocladus (Synonyms: Allocarya leptoclada, Plagiobothrys orthocarpus) - At least some of the lower stem leaves are opposite. Corolla limb 1-4 mm wide. Calyx lobes assymetrical (longer on one side of flower or fruit or all turned to one side of calyx). Prostrate plants of vernally moist sites.
Soft Plagiobothrys, Soft Popcornflower: Plagiobothrys mollis var. mollis (Synonyms: Allocarya mollis, Allocarya mollis var. mollis, Plagiobothrys mollis) -
Rusty Plagiobothrys, Rusty Popcornflower, Rusty Popcorn Flower: Plagiobothrys nothofulvus - Stem leaves generally alternate. Basal leaves tufted and persistent. Stems erect to ascending, simple to branched. Corolla limb 4-9 mm wide.
Eastside Popcornflower, Scouler's Popcorn Flower: Plagiobothrys scouleri var. penicillatus (Synonyms: Allocarya cognata, Allocarya cusickii, Allocarya hispidula, Plagiobothrys cognatus, Plagiobothrys cusickii, Plagiobothrys hispidulus, Plagiobothrys scopulorum, Plagiobothrys scouleri, Plagiobothrys scouleri ssp. penicillatus, Plagiobothrys scouleri var. cusickii, Plagiobothrys scouleri var. hispidulus) - At least some of the lower stem leaves are opposite. Corolla limb 1-4 mm wide. Calyx lobes symetrical (same lengths and shapes on all sides of flower). Prostrate to ascending or erect plants of vernally moist sites.
Scouler's Popcornflower, Scouler's Popcorn Flower: Plagiobothrys scouleri var. scouleri (Synonyms: Allocarya granulata, Allocarya scouleri, Plagiobothrys granulatus, Plagiobothrys reticulatus var. rossianorum, Plagiobothrys scouleri var. scouleri) - At least some of the lower stem leaves are opposite. Corolla limb 1-4 mm wide. Calyx lobes symetrical (same lengths and shapes on all sides of flower). Prostrate to ascending or erect plants of vernally moist sites.
Pacific Popcornflower, Pacific Popcorn Flower, Slender Plagiobothrys, Slender Popcornflower, Slender Popcorn Flower: Plagiobothrys tenellus (Synonym: Plagiobothrys asper) - Stem leaves generally alternate. Basal leaves tufted and persistent. Stems erect to ascending, simple or with a few branches. Corolla limb 2-4 mm wide.
Bristly Plagiobothrys, Bristly Sonnea, Cascade Popcornflower: Sonnea hispida (Synonym: Plagiobothrys hispidus) -