6 



Of the species here enumerated only three are found within 

 the limits of North America, the most widespread being : 



2 



T. latifoUa. — ^i. Staminate flower, with bract attached, X 3. 2. Fertile and 

 steriTe flower, X 3. 3. Ripe fruit of do. after leaving the spike, X 3. 



I. T. latifolia^ (L. sp. 1377). (Figs, i 3). 



This is too well known to need description. It may ordinar- 

 ily be distinguished by its blackish color when ripe, and by the 

 contiguity of the spikes, though neither these nor the breadth of 

 the leaves should be relied upon. The absence of bracts from its 

 pistillate spikes, its spatulate stigmas and four-grained pollen, are 

 the most satisfactory tests. At maturity the flower stems separ- 

 ate from the lower part of the stalk, leaving the rachis covered 

 with coarse, reddish bristles about i line in length. Otherwise 

 the surface of the rachis is smooth. 



The species is found throughout North America. 



" Van elongata'' W. R. Dudley, Cayuga Flora, p. 102. Of 

 this form I have not been able to obtain a specimen for examina- 

 tion. Prof. Dudley states that its fruiting spike is sometimes as 

 much as 12 inches in length; but if only the length of the spike is 

 considered, that would hardly warrant even a varietal distinction. 



6 



7 



S 



Typha angustifolia. — 4. Fertile and sterile flower, X 10. 5. Pistillate bracts, 

 X 10. 6. Style, highly magnified. 7, Perigonial seta, highly magnified. 8, g. 

 Staminate bracts, X 10. 



2. 



J! angustifolia^ (L. sp. 1377, Excl van /?). (Figs. 4-9). 

 This' species is much more Hmited in its range than the pre- 



