72 Sparganiaceae Sparganium 



Staminate and pistillate parts of spike usually separated by an interval of 0.5-6 cm; 

 stems slender, usually 8-12 dm high; leaves more or less dorsally convex, the 

 lower ones mostly 4-7 mm wide; sterile flowers scarcely shorter than the hairs; 

 pollen grains single; stigmas linear; mature pistillate spikes 10-18 mm in 

 diameter 2. T. angustifolia. 



1. Typha latifolia L. Common Cattail. Map. 69. Found in ditches, 

 ponds, marshes, gravel pits, and marshy places about lakes and along 

 streams. It is frequent in the lake area, becoming infrequent to local in 

 the southern part of the state where its habitat is rarely found. 



Throughout temperate N. A. ; cosmopolitan. 



2. Typha angustifolia L. Nakrowleaf Cattail. Map 70. This species 

 is usually found on the borders of larger bodies of water than the preced- 

 ing species, but it seems to adapt itself to nearly the same habitats. Near 

 my home is a small gravel pit that has not been in use for about 10 years, 

 and it is now filled with both species of cattails, this species occupying 

 about a fourth of the space. It is to be noted that the pistillate part of the 

 spike sometimes divides. I have one specimen with a 5-parted spike. I 

 also have a specimen of the preceding species that has a 3-parted spike. 

 This species, as well as the preceding one, is variable, and several varieties 

 have been named. A giant form of this species is found on the east side 

 of Tippecanoe Lake in the southern part of Noble County. Peattie's var. 

 calumetensis seems to me to be an ecological form. Its diminutive size I 

 attribute to the pollution of the Grand Calumet River near where it is 

 found. In the summer when the soil along the bank is exposed it is slimy 

 and reddish. 



N. S. to Fla., mainly along the coast, and inland mostly about the Great 

 Lakes ; almost cosmopolitan. 



10. SPARGANIACEAE Agardh Bur-reed Family 

 54. SPARGANIUM [Tourn.] L. Bur-reed 

 [Fernald. Notes on Sparganium. Rhodora 24: 26-34. 1922.] 

 The following key has been adapted from this paper : 



Achenes broadly obpyramidal, sessile, truncate or retuse at the summit, 4-8 mm in 

 diameter; stigmas 2; anthers 1.5-2 mm long; sepals nearly equaling the achenes. 



1. S. eurycarpum. 



Achenes fusiform, short-pedicelled, beaked, 1.2-3 mm in diameter; anthers 0.5-1.6 mm 

 long; sepals from much shorter than to two thirds as long as the achenes. 

 Staminate heads 2-20 (rarely only 1) ; fruiting heads 1.2-3.5 cm in diameter; mature 

 achenes strongly fusiform, 5.5-14 mm long, the stipe 1-4 mm long, the slender 

 beak 1.5-6 mm long; plants erect. 

 Pistillate heads or branches strictly axillary ; achenes with the beak abruptly con- 

 tracted above the dilated base; leaves 6-12 mm wide, without a scarious 

 margin. 

 Leaves stiffish, at least the middle keeled; inflorescence branched, some branches 

 all staminate, or some both staminate and pistillate, with 1-4 pistillate 

 heads and up to 8 staminate heads; stigmas 2-4 mm long; fruiting heads 

 usually 3-7, 2.5-3.5 mm in diameter; achenes lustrous, the body 5-7 mm 

 long- and 2.5-3 mm thick, the beak 4.5-6 mm long; anthers 1-1.6 mm long. 



2. S. androcladum. 



