INDEX. 



349 



Styles, hairs within, origin of, 139 ; 

 of heterostyled plants, 203, seqq. ; 

 movement of springs in, of Pansy, 

 (fig. 54) 255 ; piston-action of, 

 (fig. 11) 60; of self-fertilising 

 plants, 254 



Stylopod, placental origin of, 72 



Superposition, of carpels, 44; laws 

 of, 41 



Supportive tissues, 127 



Symmetry, floral, changes in, 186; 

 decrease and increase of, 18; illus- 

 trations of, in Banunculaceoe, 21 ; 

 and phyllotaxis, 14 ; variations of, 

 12 



Syncarpous pMil, 62 



Syngenesious anthers, 59 



Tendrils, of Ampelopsis, 145 ; of 

 Cucurhilacece, 145 ; thickening of, 

 due to iri'itation, 156 



Teratology, 2, 285, seqq. ; 295, seqq. ; 

 301, seqq. 



Teucrium, structure of flower in adap- 

 tation to insects, 56, (fig. 36) 117 



Trichomes, origin of, 133, seqq. 



Trimorphic flowers, 210, seqq. 



Typical flower, diagram and structure 

 of, (fig. 1) 3 



U 



Uncaria, hook of, (fig. 46) 156 

 Unions, cause of, 84 ; effect of hyper- 

 trophy in, 86 ; illegitimate, 206 ; 

 legitimate, 204 

 Unsymmeti'ical, corolla, 5 ; deci'ease 

 in floral whorls, 20 



Variation, principles of, in flowers, 4 

 Vascular cords, in Campanula, (fig, 8) 



43 ; as floral units, 300, 308, 309 ; 



in Malvaceae, 43 ; origin of, 42. See 



Cords. 

 Versatile anthers, cause of, 268 ; in 



wind-fertilised flowers, 266, seqq. 

 Verticillate and opposite leaves, 91 

 Vessels and cells, constructed to resist 



pressure, 127 ; as supportive, 127 

 Violet, cleistogamous, (fig. 56) 258 ; 



style and stigma of, in self-fertilising 



forms, (fig. 55) 257 

 Virescence, explained, 301 



W 



"Weeds, and fertilisation, 281; self- 

 fertilising, cosmopolitan, 283 



White flowers, 1 80 ; efi'ect of crossing 

 with, 180 ; and self-fertilisation, 

 182 



Whorls, floral,alternation of, 39, seqq.; 

 arrangement of, 39, seqq. ; examples 

 of one to twelve membered, 25, 

 seqq. ; illustrations from Eanun- 

 culacece, 21, seqq. ; origin of, in 

 CrucifercBy (fig. 6) 32 ; projected 

 cycles, 38 ; superposition of, 39, 

 seqq. ; symmetrical increase and 

 decrease of, 18, and cause of, 19; 

 of typical flower, (fig. 1) 3 



Wind-fertilised flowers. See Ane- 

 mophilous and Anemophily. 



Wood-fibre, origin of, 250 



Zygoraorphism, origin of, 102, 116, 

 seqq. 



32 



