72 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



Key to the species 



1. Staminate and pistillate portions of the inflorescence usually contiguous, 

 the pistillate portion finally more than 2 cm. in diameter; pollen grains 

 in 4's; pistillate flowers commonly without bractlets 1. T. latifolia. 



1. Staminate and pistillate portions of the inflorescence usually separate, the 

 pistillate portion less than 2 cm. in diameter; pollen grains single; pistil- 

 late flowers commonly with hairlike bractlets, these more or less dilated at 

 apex 2. T. angustifolia. 



1. Typha latifolia L., Sp. PL 971. 1753. 



Flagstaff and Tuba (Coconino County), Pinal Creek (Gila County), 

 Fish Creek (Maricopa County), 1,500 to 7,000 feet. Widely dis- 

 tributed in North America and Eurasia. 



Broadleaf cattail. 



2. Typha angustifolia L., Sp. PL 971. 1753. 



Apache, Coconino, Gila, Maricopa, and Cochise Counties, 1,000 to 

 7,500 feet. Widely distributed in the Northern Hemisphere, also in 

 South America. 



Narrowleaf cattail. Apparently more common in Arizona than 

 T. latifolia. The two species are not always distinguishable by the 

 width of the leaves. 



4. SPARGANIACEAE. Burreed family 



1. SPARGANIUM. Burreed 



Aquatic or semiaquatic herbs; leaves 2-ranked, alternate, sessile, 

 linear ; flowers monoecious, small, in dense globular heads, these sessile 

 or stalked; staminate flowers borne in the upper heads, with 3 to 5 

 stamens, without a true perianth but subtended by minute scalelike 

 bracts; pistillate flowers borne in the lower heads, with a perianth of 

 3 to 6 scalelike divisions; ovary 1- or 2-celled; fruit 1- or 2-seeded. 



Key to the species 



1. Achenes sessile or very nearty so, obovoid or cuneate-obpyramidal, truncate or 

 depressed at apex, with a stout conic beak more than one-half as long as 

 the achene ; inflorescence usually branched; fruiting heads at maturity com- 

 monly 2 to 3 cm. in diameter 1. S. EURYCARPUM. 



1. Achenes stipitate, fusiform, pointed at apex; inflorescence not branched; 

 fruiting heads less than 2 cm. in diameter 2. S. simplex. 



1. Sparganium eurycarpum Engelm. in A. Grav, Man., ed. 2, 430. 



1856. 

 McNary (Apache County), 7,400 feet, in a marsh (Peebles and Smith 

 12480). Newfoundland to British Columbia, south to Virginia, 

 Arizona, and California. 



2. Sparganium simplex Huds., Fl. AngL, ed. 2, 401. 1778. 

 Kaibab Plateau (Coconino County), "abundant in older ponds" 



(Herb. Grand Canyon Nat. Park). Widely distributed in the 

 Northern Hemisphere. 



The authors refer the specimen in question to S. simplex with con- 

 siderable hesitation. The bracts are not conspicuously scarious- 

 margmed, but the leaves seem too broad for S. angustifolium Michx. 



