Chap. VI. 



ON HETBEOSTYLED PLANTS. 



249 



Table 34. 



Relative Diameter of the Pollen-grains from the forms of the same 

 Heterostyled Species ; those from the short-styled form leing 

 represented hy 100. 



Dimorphic Species. 



From the Long-* 

 styled form. 

 . 100 



Cordia (sp. ?) 



Gilia pulchella ■ 

 „ micrantha . 



Sethia acuminata 



Erythroxylum (sp. ?) 



Cratoxylon formosum 



Mitchella repens, pollen- 

 grains of the long-styled 

 a little smaller. 



Borreria (sp. ?).... 



Faramea (sp. ?)...* 



Suteria (sp. ?) (Fritz Miiller) 



Houstonia ccerulea . 



Oldenlandia (sp. ?) . . . 



Hedyotis (sp. ?) . 



Coococypselum (sp. ?) (F.l 

 Muiler) .... J 



Lipostoma (sp. ?) ... 80 



Cinchona micrantha. . . 91 



100 

 81 

 83 

 93 

 86 



92 

 67 

 75 

 72 

 78 

 88 



100 



Trimorphic Species^ 



Katio expressing the extreme differences 

 in diameter of the pollen-grains from the 

 two sets of anthers in the three forms. 

 Lythrum salicaria .... 60 

 Nesaea verticillata .... 65 

 Oxalis Valdiviana (Hildebrand) 71 



„ Eegnelli 78 



„ speciosa 69 



„ sensitiva .... 84 

 Pontederia (sp. ?) . . . .55 



Katio between the diameters of the pollen-* 

 grains of the two sets of anthers in the 

 same form. 



Oxalis rosea, long-styled form\ «« 



(Hildebrand). . ./ "'* 



., compressa, short-styled\ „„ 



form ;**'■' 



Pontederia (sp. ?) short-styled\ „_ 



form. . . ./ '^^ 



„ other sp., mid-styled "i q„ 

 form. . . ./ 



and we should bear in mind that in the case of 

 spheres differing to this degree in diameter, their 

 contents differ in the ratio of six to one. With all 

 the species in which the grains differ in diameter, 

 there is no exception to the rule that those from the 



