| Family | ROSACEAE |
| Genus species | Petrophytum cinerascens (Piper) Rydb. |
| Synonyms | Spiraea cinerascens Piper |
| Luetkea cinerascens (Piper) A.Heller | |
| Habitat | rocks |
| Altitude | 200-600m |
| Description | leaves oblanceolate-spathulate, 10-25mm, 3-veined, sparsely appressed pubescent, floral stems with numerous linear bracts, raceme spicate, 2-6cm long, petals minute |
| Size | 5-10cm |
| Color | white |
| Bloom | summer |
| Ca | + |
| Type | subshrub, cushion |
| Cultivation | sunny, dry, rock crevices, protection against winter wet alpine house, poor, drained soil, sun |
| Propagation | seed in winter, germ. 1-3 months, 16-18°C cuttings in late summer |
| Territory |
Northern America
Northwestern U.S.A. (Washington) |
| Bibliography | Plants of the World online powo.science.kew.org International Plant Names Index www.ipni.org |
| Comments | ROSACEAE
|