THE PERFECT AND COMPLETE FLOWER. 



15 



ren, because its share in the work of reproduction is very 

 brief, and it dies as soon as this is accomplished. The pistil- 

 late flower is called Fertile, because it does almost the whole 

 work of reproduction — sometimes the whole. 



Ex. . In. the Maple, Pea, etc., after the poUeu-grains of the stamen 

 fertilize the ovule of the pistil the stamen dies in a few hours. The 

 ovule develops into a fruit, requiring the entire summer to ripen. The 

 case is the same in Cryptogamia. See Vaucheria, Pigure 1, C. 



LESSON IV. 



THE PEEPECT AND COMPLETE FLOWER— BASIS OF 

 OLASSinCATIOlSr— BOTANICAL NAMES. 



28. Perfect Elower. 29. Complete Plower. 80. Arrangement of 

 parts. 31. Basis of Classification. 32. Emhryo rules the structure. 

 33. Order of Classification. 34. Botanical names. 



28. The Perfect Flower is monoclinous (27). In the 



lower phanerogams the pistil, stamen, and torus make the 



entire flower, as in the Black Pepper and the Ash (Fig. 



8, A); here 



the torus is a 



mere point of 



union with the 



stem. 



Fig 8.— a, flowor of Common Ash (Fraxdnm excelsior), with two united 

 pistils, which separate at maturity into two winged fruits, c; o, branch of 

 same ; b, cluster of flowers. A, magnified. 



29. The Complete Flower is also monoclinous ; but it 

 is furnished with outer parts called Floral Envelopes, as in 

 the Rose, Hollyhock, Buttercup (Fig. 9, l, e), and the 

 Cotton (Fig. 10). 



