286 BOTANY FOR BEGINNERS CHAP, xxi 



Calyx. Gamosepalous, 10 lobes, 5 alternating, lobes small, 

 inferior, lobes toothed, hairy, reddish brown. 



Corolla. Polypetalous, 5lobed,perigynous, petals triangular 

 in shape, veined, alternating with lobes of calyx. 



Androecium (Stamens). Free, indefinite, perigynous, fila- 

 ments short, anthers 2 lobed and versatile, introrse, the outer 

 whorl ripening first. 



Gyncecium (Pistil). Apocarpous,carpels numerous,superior, 

 styles long, filiform, stigmas terminal and coloured. 



Ovules. One ovule in each carpel, placentation basal. 



Fruit. Not developed. 



Floral formula. [K (5) c 5, A QQ ] G QQ . 



Floral Diagram. (p. 258.) 



CLASSIFICATION 



Sub-Kingdom : Phanerogams. I place this plant in the 

 above sub-kingdom because it is a flowering plant. 



Division : Angiosperms. I place the plant in this division 

 because the ovules are enclosed in carpels. 



Class : Dicotyledons. I place this plant in the above Class 

 because the leaves are reticulate-veined, and the parts of the 

 flower are in fives. 



Sub-Class: Calyciflorse. This plant belongs to this sub-class 

 because the petals and stamens are inserted on the calyx 

 and are perigynous. 



Natural Order : Eosaceae. This plant belongs to this natural 

 order, because of the indefinite stamens (which are perigynous), 

 and its apocarpous pistil; the perigynous stamens distinguish it 

 from a Ranunculus. 



Genera : Geum. 



Species : Rivale. 



Common Name : Water Aven. 



For other examples see Chapters on Classification. 



