RANUNCULACEAE (CROWFOOT FAMILY) 163 
with a short beak. The seeds are smooth. 
As soon as they mature the foliage dies 
down and the plant seems to be dead. 
(Fig. 112.) 
Means of control 
The perennial roots must be killed and 
that is most quickly and certainly accom- 
plished by removing them from the soil. 
The clustering tubers do not lie very 
deeply beneath the surface and may be 
readily grubbed out, or even pulled by 
hand, when the ground is soft. Hand- 
labor is expensive, but the price of a valu- 
able cow would pay the wages of an 
ordinary farm laborer for a considerable 
time. Land too rankly infested to be 
so cleansed should be put under thorough 
cultivation and then heavily reseeded. 
SKY-BLUE LARKSPUR 
Delphinium azireum, Michx. 
(Delphinium carolinidnum, Walt.) Fie. 112. — Dwarf Lark- 
spur (Delphinium tricorne). 
Other English names: Carolina Larkspur, X 3- 
Azure-fiowered Larkspur. 
Native. Perennial. Propagates by seeds. 
Time of bloom: May to July. 
Seed-time: July to September. 
Range: Virginia, the Carolinas, and Georgia, to Arkansas and 
Missouri, northward to Minnesota and the Saskatchewan. 
Habitat: Prairies, fields, and meadows. 
A very beautiful species often cultivated in gardens. Stem one 
to two feet in height, slender, clothed in very fine, ashy-gray hairs. 
Leaves deeply three- to five-parted, the lobes with very slender, 
almost linear bases, and each again twice or thrice divided into 
natrowly linear segments; petioles long and slender, dilated at the 
base. Racemes terminal, four to eight inches long, the flowers 
numerous, large, short-pedicelled, deep sky-blue occasionally 
