Chap. VI. ON HETEKOSTYLED PLANTS. 257 



So have plants which inhabit alpine and lowland sites, 

 dry land, marshes and water.* 



When I first began to experimentise on hetero- 

 styled plants it was under the impression that they 

 were tending to become dioecious ; but I was soon forced 

 to relinquish this notion, as the long-styled plants of 

 Primula which, from possessing a longer pistil, larger 

 stigma, shorter stamens with smaller pollen-grains, 

 seemed to be the more feminine of the two forms, 

 yielded fewer seeds than the short-styled plants which 

 appeared to be in the aboTe respects the more mascu- 

 line of the two. Moreover, trimorphic plants evidently 

 come under the same category with dimorphic, and 

 the former cannot be looked at as tending to become 

 dioecious. With Ly thrum salicaria, however, we have 

 the curious and unique case of the mid-styled form 

 being more feminine or less masculine in nature than 

 the other two forms. This is shown by the large 



* Out of the 38 genera Icnown which (i.e. 43 per cent.) contain 



to include heterostyled species, species inhabiting the just-speci- 



about eight, or 21 per cent., are fied stations. So that 43 per cent, 



more or less aquatic in their of those British plants which 



habits. I was at first struck with liave their eexes separated are 



this fact, for I was not then awaie more or less aquatic in their 



how large a proportion of or- habits, wliereas only 21 per cent, 



dinary plants inhabit such sta- of heterostyled plants have such 



tions. Heterostyled plants may habits. I may add tliat tlie her- 



besaid in one sense to have their maplirodite clusses, from Monan- 



sexes separated, as the forms must dria to Gynandria inclusive, con- 



mutuaily fertilise one another. fain 447 geneva, of which 113 are 



Therefore it seemed worthwhile aquatic in the above sense, or only 



to ascertain what proportion of 2,^ per cent. It thus appears, as 



the gtnera in the Linnean classes, far as can be judged from such 



Monoecia, Dioeoia and Poly- imperfect d.ita, that there is some 



gamia, contained species which connection butween the separation 



live "in water, marches, bogs or. of the spxes in plants and the 



watery places." In Sir W. J. watery nature of the sites which 



Hooker's 'British Flora' (4th they inhabit ; but that tliis does 



edit. 1838) these three Linnean not hold good with heterostyled 



elftasea include 40 genera, 17 of species. 



