ASTERS, DAISIES AND EVERLASTINGS. 57 
Daisies easily by the long hair or bristlets, which constitute the limb 
of the calyx, the latter in Daisies being very short or altogether 
undeveloped ; 
moreover the 
bracts surround- 
ing the florets of 
Asters form usu- 
ally several rows, 
whereas in Daisies 
they are generally 
reduced to two 
rows. Asters have 
never the tube of 
the fruit-calyx ex- 
panded into mem- 
branes, as not 
rarely is the case 
with Daisies, the 
latter being also 
mostly smaller 
plants. Species 
with almost ray- 
less flowers occur 
in both genera, 
but are rare. The 
Burr-Daisies are 
comprised within 
the genus Calotis, 
so named by R. 
Brown, because 
two _ earshaped 
membranes of 
pretty appearance 
terminate along 
with short barbed 
spines the fruits 
of a few species. 
Fie. XXV, 
Fic. XX V.—(Cotula Cunninghami).—1,a central flower 
with its fruit ; 2, a marginal flower with its fruit ; 3, longi- 
tudinal section of a central flower and fruit; 4, stamens, 
laid free by expansion; 5, a pollen-grain, 250 times mag- 
nified ; 6, longitudinal section of a marginal flower; 1, 2, 
3, 4, and 6 many times magnified. 
