2158 A TEXTBOOK OF THEORETICAL BOTANY 



1 . Herhae 



A. Imperfectae (Flowerless plants). 



B. Perfectae (Flowering plants). 

 Dicotyledones (with two cotyledons). 

 Monocotyledones (with one cotyledon). 



2. Arbor es 



Dicotyledones. 

 Monocotyledones. 



The scheme left by Linnaeus was further elaborated by Bernard de 

 Jussieu and later enlarged, perfected and published by his nephew Antoine 

 Laurent de Jussieu (Fig. 2065) in 1789. This system recognized the impor- 

 tance not only of the cotyledons and the stamens, but also of the petals and 



I 



Fig. 2065. — Antoine de Jussieu. Copy 

 of a portrait supplied by courtesy of 

 the Wellcome Historical Medical 

 Museum. 



carpels. It was in fact the first effort to formulate a natural system. Since 

 many of his one hundred families are still accepted it may be justifiable to 

 outline the main points of the scheme. 



Natural Orders 

 Acotyledones 



Monocotyledones 



Stamina hypogyna 

 Stamina perigyna 

 Stamina epigyna 



Dicotyledones 

 Apetalae 



Stamina epigyna 



Classes, with Examples 



1 (mainly Cryptogams) 



2 (Aroideae, Typhae, Gramineae) 



3 (Palmae, Junci, Lilia, Irides) 



4 (Musae, Orchides) 



5 (Aristolochiae) 



