78 ELEMENTARY BOTANY 
Anemone, all have a conspicuous calyx. When the calyx is 
petaloid, the corolla is either absent or very much reduced. 
It is interesting to trace the 
development of nectaries in this 
Order. In the Buttercup, they 
are at the base of each petal, 
underneath a scale. 
The petals of another species 
of Ranunculus (2. auricomus) 
= \ ~~. show a great variety: there is 
 ._ | ___ the scalelike form; then each 
fo 10k = Wise n on petal may have pockets at the 
HELLEBORE. base (Fig. 97); or, lastly, the 
n, petals modified into tubular whole petal may be tubular. 
Berek A comparison of this species 
with the nectaries of the Hellebore helps us to understand how 
the modification of the petal into a tubular nectary has arisen. 
In the Marsh Marigold, the nectaries occur as little depressions 
on the sides of the base of each 
carpel. Some few plants belong- 
ing to this Order are without 
honey. 
Clematis should be caretully 
observed, for it differs in many 
respects from the other genera. 
Its petioles are modified for 
climbing, the leaves are com- 
pound and opposite. There are 


Fie. 102.—GYNACIUM OF 
. no petals, and the styles are Marsa MARIGOLD. 
modified into organs of dis- n, nectaries on each carpel. 
persion. 
The Ranunculacee belong for the» most 
part to the temperate zone.  Buttercups, 
Anemones, Celandines, so familiar to English children, are 
unknown to those living in tropical countries, for the 
Ranunculacee are hardly found in the tropics except on 
mountains. | 
Distribution. 
