ROSE FAMILY 163 



in racemes or panicles ; leaves alternate, simple and lobed, or of 3-7 leaflets ; 

 low shrub or vine, rarely herbaceous, usually prickly. 



1. Leaves 3-5-lobed; fruit scarcely edible 



a. Flowers single R. deliciosus 



b. Flowers several in a cluster R. parviflorus 



2. Leaves of 3-7 leaflets ; fruit edible 



a. Stems woody and prickly R. strigosus 



b. Stems herbaceous, not prickly R. americdnus 



SIBBALDIA Linne 1753 

 (Named for Sibbald, a Scotch botanist) 



Sepals 5, united into a slightly concave calyx with 5 alternating bracts, 

 petals 5, yellow, small, stamens 5, on the margin of the hairy disk, pistils 

 5-10 on short hairy stalks, style lateral, achenes 5-10, smooth; flowers in 

 cymes on nearly leafless stalks ; leaves alternate, of 3 leaflets ; tufted peren- 

 nials from a woody base. 



Stems tufted, mat-like, 2-8 in. long; flowers 3-6 mm. 

 wide 5. procumbens 



SIEVERSIA Willdenow 1811 SIEVERSIA 

 (Named for Sievers, a Russian botanist) 



PL 25, fig. 3, 4. 



Sepals 5, united into a saucer- or urn-shaped calyx, petals 5, yellow or 

 rose-purple, stamens many, pistils many, style thread-like, not jointed, 

 often plumy throughout in fruit; flowers usually 3-8; leaves interrupted- 

 pinnate with many small intermediate leaflets; perennial. 



1. Flowers rose to purple, 3-8, style plumy in fruit 5*. cilidta 



2. Flowers yellow, erect, single ; style not plumy 6*. turbindta 



SPIRAEA Linne 1753 MEADOWSWEET 



(Gr. spiraia, meadowsweet) 



Sepals 4-5, united into a bell-shaped tube, petals 4-5, white to pink or 

 purple, stamens 20-60, inserted with the petals on the calyx-tube; pistils 5 

 as a rule, follicles usually 5, 2-several-seeded ; flowers in terminal or axil- 

 lary clusters ; leaves alternate, simple, pinnatifid or pinnate ; shrub. 

 Stems 1-3 ft. high ; leaves oval to elliptic, 1-3 in. long ; 

 flowers white or rose S. lucida 



MALACEAE APPLE FAMILY 



Sepals 5, united into a tube grown to the ovary, petals usually 5, on 

 the calyx-tube, stamens many, rarely few, ovary 1-5-celled with 1-2 ovules 



