142 PELABGONIUM ZONALE. CHAP. V. 



CHAPTEE V. 



GERANIACE.E, LEGUMINOS.K, ONAJBACUZE, ETC. 



Pelargonium zonale, a cross between plants propagated by cuttiuge 

 does no good Tropseolum minus Limnanthes douglasii Lupinus 

 luteus and pilosus Phaseolus rnultiflorus and vulgaris Lathyrus 

 odoratus, varieties of, never naturally intercross in England Pisum 

 sativum, varieties of, rarely intercross, but a cross between them 

 highly beneficial Sarothamnus scoparius, wonderful effects of a 

 cross Ononis minutissima, cleistogene flowers of Summary on 

 the Leguminosse Clarkia elegans L'artonia aurea Passiflora 

 gracilis Apium petroselinum Scabiosa atropurpurea Lactuca 

 sativa Specularia speculum Lobelia ramosa, advantages of a 

 cross during two generations Lobelia fulgens Nemophila insignia, 

 great advantages of a cross Borago ofScinalis Nolana prostrata. 



XIII. G^JEANIACE^. PELAEGONITTM ZONAI/B. 



THIS plant, as a general rule, is strongly proterandrous,* and 

 is therefore adapted for cross-fertilisation by the aid of insects. 

 Some flowers on a common scarlet variety were self-fertilised, 

 and other flowers were crossed with pollen from another plant ; 

 but no sooner had I done so, than I remembered that these 

 plants had been propagated by cuttings from the same stock, 

 and were therefore parts in a strict sense of the same individual. 

 Nevertheless, having made the cross I resolved to save the seeds, 

 which, after germinating on sand, were planted on the opposite 



* Mr. J. Denny, a great raiser which also the pistil is frequently 



of new varieties of pelargoniums, short, so when it expands it is 



after stating that this species is smothered as it were by the 



proterandrous, adds (' The Florist bursting anthers ; these varieties 



and Pomologist,' Jan. 1872, p. 11) are great seeders, each pip being 



"there are some varieties, espe- fertilised by its own pollen. I 



cially those with petals of a pink would instance Christine as an 



colour, or which possess a weakly example of this fact." We have 



constitution, where the pistil ex- here an interesting case of va- 



pands as soon as or even before riability in an important funo- 



the pollen-bag bursts, and in tional point. 



