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MISSOURI BOTANICAL GARDEN 



The sharp distinction of several of the members of this 

 type from those of the following classes is quite impossible, 

 but it seems helpful to make the division. 



This class exhibits, with the possible exception of the 

 Ericaceous type, the widest range of form and structure of 

 any recognized. To it I have assigned four species of 

 Ilibbertidy Acrotrema Schumacheria, Dillenia and 8au- 

 rauia of the Dilleniaceae, JEIaeocarpus , Sloanea, Vallea, 

 Arixtotelia and Dubouzefia of the Elaeocarpaceae, Ochna, 

 Lophira and Cespedesia of the Ochnaceae, Tremanthera of 

 the Theaceae, Bixa of the Bixaceae, and Plagiopleron of 

 the Flacourtiaceae. 



Dilleniaceae. 



The flowers of the Dilleniaceae are hermaphrodite, polyg- 

 amous or dioecious, with usually five persistent sepals 

 and as many deciduous petals which are patent during 

 anthesis. The stamens are indefinite, usually numerous, 

 and various in form, the gynoecium is usually composed 

 of several more or less united carpels with free and for 

 the most part widely divergent pistils with simple stigmas. 



In Hibbertia (about 100 species, mostly confined to 

 Australia) the dehiscence is said to be by pores in one sec- 

 tion represented by 4 species, but I am not sufficiently 

 acquainted with the forms. Acrotrema (about 12 species 

 of India, Farther India and Ceylon) has many — 15-50 

 stamens, free or more or less united into 3 or 4 bundles, 

 and linear or sometimes ovate anthers generally opening 

 by two apical pores. Schumacheria (with 3 species in 

 Ceylon) is distinguished by zygomorphy. The linear or 

 broadly linear anthers open, according to Gilg, at the top 

 with two little holes which gradually increase more or less 

 down the sides in longitudinal slits. Dillenia (of about 

 23 species distributed over tropical Asia, the Indo- Malay 

 region, New Guinea, the Philippines, and Australia) has 

 usually very long anthefs which generally open at the top 

 by two pores which may sometimes become confluent into 



