( 806 ) 



exist still other races in wliieh the normnl character is semi-latent 

 to a different degree. 



De Vries thinks such cases possible, but until now they have not 

 yet been noticed '). Now the question arose to me whether in the 

 andro-monoecious Umbelliferae we may not have such races in which 

 the specific character has become semi-latent?") 



Let US start our speculations with one of those Umbellifei'ae of 

 which besides andro-monoecious ones also hermaphrodite and male 

 forms are known, e. g. Heradeum Sphondylium. 



As was remarked above, Heradeum Sphondi/Iium appears in a 

 great part of Middle Europe as a hermaphrodite plant. In the 

 en\'irons of Neu-Ruppin at the same time forms are however found 

 which are only bisexual in the umbels of the first order, whose 

 umbels of the second order are composed on half bisexual and half 

 male umbellules and whose umbels of the third order are exclusively 

 male, and which in consequence may be considered to produce about 

 as many male as bisexual flowers. 



In this country now I found besides the hermaphrodite and the 

 Neu-Ruppin middle forms a great variety of forms which may be 

 considered either as gradual transitions of those middle forms to 

 perfectly hermaphrodite ones or as gradual transitions of those middle 

 forms to perfectly male indi\idual8, which latter occur also in this 

 country. 



If we now for the present consider tliis andro-monoecious plant 

 which is so rich in forms as an ever-sporting variety, and if we 

 compare its properties with those of TrifoUum pratense quinque folium, 

 which has first been extensively dealt with hj de Vries, and later 

 has been investigated in all its details by Miss Tammes '), so that of 

 this race the properties are most completely known, then we begin 

 with asking what peculiarities Heradeum should present if its mo- 

 noecious form- represented an ever-sporting variety. 



Then we should observe : 



1. that a stronglj' developed specimen, e.g. a plant with umbels 

 of the first to the fourth order, produces more male flowers than 

 an individual which has not succeeded in getting beyond the formation 

 of umbels of the first and second order. 



1) De Vries, Mutationstheorie, 1, p. 424. 



-) In my article on clelstogamic plants I already briefly raised the question 

 wliether Ruellia luberosa, Inipaliens noli tangere, Impatiens fiilva, Ampliicarpaea 

 inonoica, Viola spec. div. are not in this condition. 



3) Bot. Zeit. Iste. Abt., Heft XI, 1904. 



