308 



ERICACEAE (HEATH FAMILY) 



of each umbel which is dark purple ; rays of the umbel crowded, 

 the inner ones shorter than the outer rows, all subtended by a whorl 

 of green, finely cut, involucral bracts. As the 

 fruits mature the outer rows of pedicels bend 

 inward, making the umbel concave and forming 

 the "bird's nest." Carpels thickly set with 

 weak spines along the secondary ribs, forming 

 a small, oblong, gray-brown bur which is light 

 in weight and may be carried far by the wind 

 or drifted with snow; these seeds have long 

 vitality and one seeding may pester the soil for 

 several years. The plant is frequently infested 

 by the leaf-spot fungus, Cercospora apii, which 

 is very injurious to Celery. (Fig. 214.) 



Means of control 



Hoe-cutting or spudding the leaf -crowns from 

 the roots during the first season, and closely 

 cutting, or, better, hand-pulling, the flowering 

 stalks of the second year. In grain fields 

 the latter method is the only way to fight the 

 weed effectively, for it is resistant to sprays that 

 would not also destroy the accompanying crop. 

 FIG. 214. Wild i n cultivated ground the plant gives little 



ro^T xT"" " trouble, for there it may be uprooted with hoe 

 or cultivator in its first season a process 



which at once destroys it. 



NARROW-LEAVED LAUREL 

 Kdlmia angustifblia, L. 



Other English names: Dwarf Laurel, Sheep Laurel, Sheep Poison, 



Lambkill, Calfkill, Wicky. 

 Native. Perennial. Propagates by seeds. 

 Time of bloom: June to July. 

 Seed-time: Ripe in September, but often persistent on the shrub 



until winter. 

 Range: From Newfoundland to Hudson Bay and southward to 



Georgia. 

 Habitat: Hillsides, pastures, and bogs. 



