I5 8 ROSE ORDER 



KELSEYA Rydberg 1900 

 (Named for Kelsey, an American botanist) 



Sepals 5, united into a hairy calyx, petals 5, white, stamens 10, inserted 

 on the margin of the disk, pistils 5 ; flowers solitary and hidden at the ends 

 of the branches; leaves simple, imbricated; tufted perennial. 

 Stems 3-4 in. high; leaves oblong-spatulate, 2-4 cm. 



long K. uniHora 



OPULASTER Medicus 1799 NINEBARK 



(Lat. name of the wild cranberry tree) 



PL 26, fig. 4. 



Sepals 5, united into a bell-shaped calyx, petals 5, white, on the throat 

 of the calyx, stamens 20-40, inserted with the petals, pistils 1-5, stigma ter- 

 minal, globose, pods 1-5, more or less inflated, 2-4-seeded, splitting when 

 ripe; flowers in terminal corymbs; leaves simple, palmately lobed; shrub. 

 Bushy, 1-6 ft. high; carpels mostly 2-3, somewhat in- 

 flated or compressed, as long or longer than the 

 calyx O. opulifolius 



PETROPHYTUM Nuttall 1840 

 (Gr. petra, rock, phyton, plant) 



Sepals 5, united into a silky-hairy calyx, petals 5, white, stamens many, 

 pistils 3-5, styles hairy below, follicles 1-2-seeded ; flowers in a short spike, 

 leaves entire, crowded into a rosette ; stems woody, tufted or matted. 

 Stems in a dense mat; leaves oblong-spatulate, 8-10 



mm. long P. caespitosiim 



POTENTILLA Linne 1753 POTENTILLA, CINQUEFOIL 



(Lat. potens, powerful, from reputed medical properties) 



PI. 25, fig. 2. 



Sepals 5, united into a concave or hemispheric tube with 5 alternating 

 bracts, petals 5, rarely 4, yellow, rarely white or purple, stamens many, 

 seldom fewer, pistils many, style terminal, deciduous ; flowers solitary or 

 in cymes ; leaves compound, digitate or pinnate ; annual or perennial. 

 1. Flowers many in leafy cymes; leaves mostly of 

 3-5-leaflets, digitate; style swollen toward the 

 base; mostly annuals 

 a. Achenes with a large wart or swelling on the 



side p. paradoxa 



