298 



THE CROSSING OF FLOWERS. 



codendron), Laurels (e.g. Laurus nobilis and Sassafras), many Docks (e.g. Rumex 

 alpinus and obtusif alius), the Wall Pellitory (Parietaria), and also some Saxi- 

 frages (e.g. Saxifraga controversa and tridactylites). 



The ninth group consists of species whose individuals each bear true herma- 

 phrodita flowers along with true pistillate and true staminate flowers. The Ash 



(Fraxinus excelsior; 



see fig. 230, p. 138) is 



^■- ""^>' ^'' )?>'"Pi;i,L an example of this 



group. 



Now come the 

 groups whose species 

 contain two or three 

 kinds of flowers dis- 

 tributed on two or 

 several plants. 



Species belonging 

 to the tenth group 

 bear true hermaphro- 

 dite flowers on one 

 plant and pseudo- 

 hermaphrodite female 

 flowers on another. 

 Examples of this are: 

 numerous Valerians 

 (e.g. Valeriana mon- 

 tana, Saliunca, su- 

 pina), some Dipsacese 

 (e.g. Scabiosa lucida, 

 Knautia arvensis), 

 many Saxifrages (e.g. 

 Saxifraga aquatica), 

 the cultivated Vine 

 Fig. 286.-Type of a moncBcious plant. ( Vitis vinifero), many 



I Oak (Querms pedunculata); pistillate flowers on the upper part of the twig, staminate Oaryophyilacese (e.g. 

 flowers (in pendent catkins) below, a A single pistillate flower of the same plant. lliia'nfh'll'i alobcidlis 



3 Three staminate flowers of the same plant, i nat. size; 2 and s x 4. UiaiUb y 



and prolifer, Lychnis 

 Viscaria, Silene noctiflora), and, especially, very many Labiatse (e.g. Galamintha, 

 Olechoma, Marrubium, Mentha, Origanum, Prunella, Thymus). 



In the eleventh group we place those plants which develop true hermaphrodite 

 flowers on one plant and pseudo-hermaphrodite male flowers on another, as, for 

 example, numerous Ranunculacese (e.g. Ranunculus baldensis, Pulsatilla al/pvna, 

 vernalis, Ranunculus alpestris, glacialis), many Rosacese (e.g.Dryas octopetala, Gevm 

 m,ontanum and reptans), and many species of Vine (e.g. Vitis sylvestris, macrocirrha). 



