| Family | MONTIACEAE |
| Genus species | Calyptridium monospermum Greene |
| Bibliography | Erythea 3: 63 (1895) |
| Native Range | sw. Oregon to Baja California |
| Primary Biome | Temperate |
| Habitat | rocky slopes |
| Altitude | 300-3500m |
| Description | basal leaves spathulate, 1-15cm long, stem leaves smaller, inflorescence umbellate cyme, flowers subsessile, sepals orbiculate, 3-8mm, petals 4, 3-9mm long |
| Size | 10-40cm |
| Color | white, rose |
| Bloom | spring, summer |
| Ca | |
| Type | perennial |
| Cultivation | sunny rock crevices, protection against winter wet alpine house, poor, drained soil, sun |
| Propagation | seed in spring, germ. 1-3 months 18-21°C cuttings of rosettes in summer |
| Synonyms | Cistanthe monosperma (Greene) Hershk. Spraguea caespitosa Rydb. Spraguea eximia Eastw. Spraguea hallii Rydb. Spraguea irregularis Rydb. Spraguea monosperma (Greene) Rydb. Spraguea pulcherrima A.Heller |
| Territory | 7 Northern America 73 Northwestern U.S.A. (ORE Oregon) 76 Southwestern U.S.A. (CAL California, NEV Nevada) 79 Mexico (MXN Mexico Northwest) |