INTE 
ROSACEAE 
1. Trees or woody shrubs. 
2. Ovary inferior; fruit a pome or berry. 
3. Plant not spiny; mature carpels papery. 
4. Flowers in racemes; pome small, berry-like... Amelanchier 
4. Flowers in corymbed or umbellate cymes, 
very showy; pome large and fleshy (a 
berry in P. melanocarpa)......essceccssesccere Pyrus 
3. Plant with long spines; mature carpels 
hard, with 1 to 5 bony nutlets..........+++-ee-. Crataegus 
2. Ovary superior; fruit a follicle, capsule, 
or drupe. 
5. Plant a shrub; fruit dehiscent, a follicle 
or capsule. (Also, flowers white in dense 
elongate panicles in species collected; 
EULEIVaAted)circps cicisiecis¢ dieee sie'e eieivlsie wile sis\eisieisisicieie se) OPAkaeas 
5. Plant a tree; fruit indehiscent, a drupe. 
(Also, flowers in racemes or corymbS)...+.++eee+ Prunus 
1. Herbs or semi-woody shrubs, the latter thorny. 
6. Ovaries partly or entirely enclosed by the calyx. 
7. Plant herbaceous. 
8. Calyx covered with stiff, hooked bristles; 
petals 5, yellow; leaves pinnately 
COMPOUNA La) sgeteyets eve epateloveloks| Vols sifels) siesel eleleleleisyeisleisfele PAC TAMON La 
8. Calyx without hooked bristles; petals none, 
flowers greenish; leaves palmately cleft. 
Expected (Alchemilla). 
7. Plant a thorny shrub. (Also, flowers white 
and pink, showy; calyx an open cup, ripening 
as a fleshy lip; leaves pinnately compound)..... Rosa 
6. Ovaries not enclosed by the calyx. 
