104 . EOSACEAE 



1. PLATANUS L. 



Characters of the family. 



1. P. oocldentalis L. Sycamore. Often 130° high : bark exfoli- 

 ating : leaves 4'-9' -wide, trnnoate at base and lobed above : fruiting 

 heads long-peduncled. — Common along streams. May. 



Family 58. ROSACEAE B. Juss. 

 Plants with alternate usually stipulate leaves, and irregular usually 

 perfect flowers. Calyx usually 5-lobed, and distinct from or adnate to 

 the ovary. Petals usually five. Stamens numerous. Carpels 1-many, 

 distinct or united. Fruit usually 1-celled, and ovules 1-several. 



Calyx 5-oleft. Petals 5, white. Stamens 20-40. Follicles 1-5, in- 

 flated, 2-valved, 2-4-seeded. 



1. O. intermediua Eydb. Nine-baek. 3°-10° high, branching : 

 leaves orbicular, serrate, 3-lobed above, petioled : ovaries 3-4, finely 

 pubescent. — Eocky bluffs of the Missouri Eiver from Eook Creek to 

 Courtney. Frequent. May. 



2. SPIRAEA L. s 



Like the last but follicles 5-8, 2-many-seeded, not inflated and de- 

 hiscent by but one suture. 



1. S. salicifolia L. MEADOW Sweet. 2°-3° high : leaves petioled, 

 oblanoeolate, serrate : flowers small, white, in dense terminal panicles. — 

 In low meadows near Lake City flde Eev. Cameron Mann. Very rare. 

 July-September. 



3. RUBUS L. 



Shrubs with prickly stems, terminal panicled flowers and alternate com- 

 pound leaves. Calyx 5-parted. Petals 5. Stamens numerous. Carpels 

 many, ripening into drupelets imbedded in the succulent receptacle. 



Leaflets white beneath. 1. B. occidentalis. 



Leaflets not white beneath. 



