Lo 
PLANTS RELATED TO THE CHICKWEED. 5 
Viscaria oculata, &¢.—Common garden annuals. Note that the 
inflorescence is a 1-sided cyme, only one lateral branch being developed 
below each flower. The calyx is sharply 10-ridged, 5 of the ridges 
corresponding to the midribs of the united sepals, and 5 to their lines of 
union... (The sepals being joined, the cohesion of the calyx is said to be 
gamosepalous.*) Note the 5 petals, each with a bifid scale at the 
junction of the claw and the limb, the 5 scales forming a corona. In 
the fruit, notice the dry inflated calyx with the ridges more strongly 
developed than they are in the flower; on removing it you will observe 
the withered remains of the petals and stamens adhering to the conical 
ovoid (—egg-shaped) ovary. Notice that the latter is mounted on 
a short stalk, which is a por- | 
tion of the pedicel continued 
above the attachment of the 
calyx. Make a longitudinal 
and @ series of transverse sec- 
tions through the hard peri- 
carp. You will find that 5 
dissepiments spring from the 
walls and go almost into the 
ecntre, but are not in abso- 
lute contact with the column, 
so that the placentation is still 
Fig. 26. Petal of 
Visearia. 
Fig. 27. Trans- 
verse section of 
ovary of Vis- , 
earua (mag.). Fig, 28. Flowering branch of Spurrey. 
basal, The dissepiments do not reach to the top of the ovary, so that the 
transverse sections taken near the top show a 1-celled ovary, while those 
about the middle appear to be 5-celled. 
Single Pink (Dianthus sp.)—Note the linear entire sessile leaves, 
arranged In opposite pairs, the 1-sided cymes (see Pl. IL., fig. 11), the four 
bracts under each flower just like very short leaves, which indeed they 
* Gy. gamos, union. 
