| Family | SAXIFRAGACEAE |
| Genus species | Boykinia major A.Gray |
| Bibliography | Bot. California [S.Watson & al.] 1: 196 (1876) |
| Native Range | nw. USA to California |
| Primary Biome | Temperate |
| Habitat | thickets and woods |
| Altitude | 200-2200m |
| Description | leaves 10-20cm wide, orbiculate to renirom, 5-7-lobate, lobes incised and dentate, dark green, flowers small in compact corymb |
| Size | 50-130cm |
| Color | white |
| Bloom | summer, autumn |
| Ca | - |
| Type | perennial |
| Cultivation | cold, shady site with a humous, moist soil alpine house, moist, humous soil, shade |
| Propagation | seed in spring, barely covered, germ. 3-6 months, 16-18°C division in early spring |
| Synonyms | Therofon majus (A.Gray) Kuntze |
| Territory | 7 Northern America 73 Northwestern U.S.A. (IDA Idaho, MNT Montana, ORE Oregon) 76 Southwestern U.S.A. (CAL California) |