Ciiap. X. PLANTS FERTILE WITHOUT INSECT-AID. 367 



cellently adapted for cross-fertilisation by the bees which 

 freely visit them, set abundantly under a net. 



I. noli-me-tangere (Balsaminaceae). This species produces cleis- 

 togamic and perfect flowers. A plant was covered with a net, 

 and some perfect flowers, marked with threads, produced 

 eleven spontaneously self- fertilised capsules, which contained 

 on an average 3 '45 seeds. I neglected to ascertain the 

 number of seeds produced by perfect flowers exposed to the 

 visits of insects, but I believe it is not greatly in excess of 

 the above average. Mr. A. W. Bennett has carefully described 

 the structure of the flowers of J.fulva in ' Journal Linn. Soc' 

 vol. xiii. Bot. 1872, p. 147. This latter species is said to 

 be sterile with its own pollen (' Gard. Chronicle,' 1868, p. 

 1286), and if so, it presents a remarkable contrast with /. 

 barbigerum and noli-me-tangere. 



Limnanthes donglasii (Geraniaceae). Highly fertile. 



Viscaria ocalata (Caryophyllaceae). Produces plenty of capsules 

 with good seeds. 



Stcllaria media (Caryophyllacese). Covered-up and uncovered 

 plants produced an equal number of capsules, and the seeds 

 in both appeared equally numerous and good. 



Beta vulgaris (Chenopodiaceae). Highly self-fertile. 



Vicia sativa (Leguminosae). Protected and unprotected plants 

 produced an equal number of pods and equally fine seeds, 

 If there was any difference between the two lots, the covered- 

 up plants were the most productive. 



V. hirsute. This species bears the smallest flowers of any 

 British leguminous plant. The result of covering up plants 

 was exactly the same as in the last species. 



Pimm sativum (Leguminosae). Fully fertile. 



Lathyrus odoratus (Leguminosae). Fully fertile. 



L, nissolia. Fully fertile. 



Lupinus luteus (Leguminosae). Fairly productive. 



L. pilosus. Produced plenty of pods. 



Ononis minutissima (Leguminosae). Twelve perfect flowers on a 

 plant under a net were marked by threads, and produced 

 eight pods, containing on an average 2*38 seeds. Poda 

 produced by flowers visited by insects would probably have 

 contained on an average 3*66 seeds, judging from the effects 

 of artificial cross-fertilisation. 



Phaseolus vulgaris (Leguminosae). Quite fertile. 



TrijMium arvense (Leguminosae). The excessively small flow era 



