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176 MISSOURI BOTANICAL GARDEN 



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II. GRAMINEOUS TYPE. 



In the characteristic anthers of the grasses the locules 

 usually open by longitudinal slits extending from above 

 downward, but more rarely (in some Andropogoneae ) by 

 a hole at the apex, often finally continued down the side in 

 slits. This type likewise is clearly distinct from all 

 others, and I shall not consider it further in this place. 



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III. TOLYGALACEOUS TYPE. 



Flowers strongly zygomorphic, with highly differentiated 

 perianth ; androecium included in a ventral carina, usually 

 monadelphous ; anthers short, generally cupuliform, basi- 

 fixed, dehiscing by a large, upper, terminal opening em- 

 bracing both locules (Polygalaceae) or by two terminal 

 pores (Fissicalyx). 



This group contains the Polygalaceae and the single 

 genu3 of the Papilionatae in which the anthers open by 

 apical pores. In structure and geographical distribution, 

 this is an interesting type, but cannot be treated in detail. 



IV. ERICACEOUS TYPE. 



Under this type I have grouped with its special represen- 

 tatives a number of structurally very dissimilar forms. 

 This has been done largely because of the systematic rela- 

 tionship of the material ; it has been deemed best to treat 

 all the Ericaceae together and in this paper I have placed 

 with them a few other genera systematically related or 

 similar in their floral structure. This type will not improb- 

 ably be broken up later, but at the present time I do not 

 care to treat in detail the various forms which I have here 

 assigned to this type, and since they are, for the most part, 

 quite distinct from those to which I intend devoting the 

 body of this paper, they may be passed over with merely 

 a general description. 



Flowers hermaphrodite, regular or rarely zygomorphic; 





