Mitchella repens: Partridgeberry; give acid leaf mould soil and shade.
PAP AVER: alpinum; nudicaule, Thibetica, are among the small poppies; all easy to grow from seed.
Pentstemon: pubescens; rupicola; alpinus and other dwarf sorts; not difficult from seed.
Polemonium: reptans, bushy but graceful; attractive blue flowers.
Potentilla: cinquefoil; various; light sandy soil; blooms midsummer; vernanana especially good.
POLYANTHUS: Bunch-primrose; vigorous growing; excellent for large rock garden.
SILENE: Catchfly; all good; Schafta blooms in fall.
Sempervivum: cactus-like plants of extreme hardiness; add rock garden character to any planting.
