Perideridia gairdneri

Plant: Perennial, glabrous, 3-14 dm; roots tuberous, single or 2-3-clustered, 1.5-8 cm, fusiform; stem erect, branched Leaves: basal petiole 8-15 cm; basal blade 20-35 cm, oblong to ovate, generally 1-pinnate, leaflets 2-12 cm, linear or lanceolate, basal sometimes lobed or ternately dissected; cauline leaves 1-2-pinnate or 1-2-ternate INFLORESCENCE: compound umbels; peduncle 3-20 cm; bracts generally 0; bractlets 8-13, 1-4 mm, linear-lanceolate; rays generally 7-16, 1.5-7 cm, unequal, spreading-ascending; pedicels 4-8 mm; secondary umbels 15-40-flowered Flowers: small, many; calyx lobes evident; petals generally obovate, white, tips narrowed; stamens 5; pistil 1, ovary inferior, 2-chambered, generally with a ± conic, persistent projection or platform on top subtending 2 free styles; styles 1-2 mm Fruit: 2 dry, 1-seeded halves that separate from each other but generally remain attached for some time to a central axis, 2.5-3.5 mm, ± round, slightly compressed side-to-side or not at all, glabrous; ribs subequal, thread-like, not winged; oil tubes per rib-interval 1; fruit axis divided to base; Seed: face flat to grooved Misc: Moist soil of flats, meadows, streamsides, grasslands, pine groves; 0-3000 m.