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 apit, 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. 
ao eta sar In cultivated ground the plant gives little 
el Ss ‘ase “ 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 angustifolia, L 
Other English names: Dwarf Laurel, Sheep Laurel, Sheep Poison, 
Lamb], 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. 
si From Newfoundland to Hudson Bay and southward to 
eorgia. 
H apitat: Hillsides, pastures, and bogs. 
