76 



ROSACEAE (ROSE FAMILY) 



Ribes fioridum, Wild 

 black currant. 



^ PLATANUS 



Large trees with outer bark peeling off in 

 thin plates. The leaves with petioles, hol- 

 low at base, and enclosing a bud of the next 

 season. Fruit club-shaped, one-seeded nut- 

 lets with a ring of bristly hairs at base. 



P. occidentalis, Sycamore. A tree reaching 

 40 m. in height with a trunk sometimes over 

 4 m. in diameter ; leaves mostly truncate at base, 

 sinuate-lobed, the lobes sharp-pointed ; fertile 

 heads solitary, hanging on long peduncle, per- 

 sistent through the winter. 

 Usually along streams in rich 

 soil. May. 



BOSACEAE (Rose Family) 



Trees, shrubs, or herbs with 

 regular flowers. Stamens 

 usually numerous, inserted on 

 the calyx. One to many car- 

 pels, which are distinct or 

 united, and alternate leaves. 



PHYSOCARPUS 



Platanus occidentalis, Sycamore; a, leaf; 

 h, staminate inflorescence; c, pistillate 

 inflorescence. 



Shrubs with simple, palm- 

 ately lobed leaves and umbels 

 of white flowers. 30 to 40 stamens, i to 5 pods, inflated. 



Fhysocarpus opuUfolius, 

 Nine-bark. 



P, opulifolius, Nine-bark. Shrub i to 3 m. 

 high. Branches long, roundish; leaves 3-lobed, 

 heart-shaped ; pods usually 3, purplish, mem- 

 branaceous. River banks and rocky places. 

 June. 



PYRUS 



Trees or shrubs with showy flowers in 

 corymbs or umbels. Stamens numerous. 

 Carpels adnate. Calyx tube and fruit fleshy 

 (pome). 



