396 Moraceae Humulus 



was about a quarter of a mile long and the trees were mostly 10-15 inches 

 in diameter near the base. I estimated that on the ground there were not 

 less than 25 bushels of fruit and 1 assumed that the trees fruited almost 

 annually. Yet 1 did not find a single seedling and I do not believe any 

 were dug up. I made no special inquiry to ascertain the cause of the fail- 

 ure of reproduction. 



Mo. and Kans., southw. to Tex. 



1972. HUMULUS L. Hop 



[Bailey. Humulus. Manual of Cultivated Plants, 239-240. 1924.] 



Petioles of principal leaves much longer than the blades; leaves 5-7-lobed; bracts 

 of pistillate flowers greenish, usually eglandular, narrow, generally long-acuminate, 

 their margins densely long-ciliate; parts of the staminate involucre usually very 



glandular, narrow, acute to acuminate; anthers eglandular 1. H. japonicus. 



Petioles of principal leaves shorter than or only equaling the blades, rarely one or more 



longer; leaves usually 3-lobed; sometimes all of the leaves on the upper part of 



the stem unlobed; bracts of pistillate flowers glandular at least at the base, not 



ciliate, stramineous, not green, broad, the lower acuminate, the middle ones 



broadly ovate, acute or obtuse; parts of the staminate involucre glandular but the 



glands easily detached and often becoming eglandular, broad, obtuse; anthers more 



or less glandular. 



Lobes of leaves short-acute at the apex or obtuse, coarsely serrate or dentate, the 



terminal lobe nearly as wide as long; lower surface of leaves sparsely glandular; 



anthers mostly with fewer than 10 glands. (See excluded species no. 187, p. 1041.) 



H. Lupulus. 



Lobes of leaves attenuate to the apex, the teeth of the margins finer than those of the 

 preceding species, the terminal lobe narrower at the base than at the middle, 

 generally at least twice as long as wide; lower surface of leaves usually copiously 

 glandular; anthers generally with more than 10 glands 2. H. americanus. 



1. Humulus japonicus Sieb. & Zucc. Japanese Hop. Map 809. Re- 

 ported from Tippecanoe County by Wilson but probably more frequent 

 than our knowledge of its distribution indicates. I found it along road- 

 sides near Warsaw and Hobart. Found, also, by Chas. M. Ek in Howard 

 County along a railroad. 



Nat. of Japan ; sparingly naturalized. 



2. Humulus americanus Nutt. American Hop. Map 810. Probably 

 found in all or nearly all of the counties of the state. It prefers a moist 

 and sandy soil and is found infrequently in low ground along streams, 

 about lakes, and along roadsides. Our manuals have not separated this 

 from the Eurasian species and all but one of our reports for the wild hop 

 have been made under the name, Humulus Lupulus. I doubt that the exotic 

 species is found in Indiana and if so, it is very rare. I have not seen a speci- 

 men of it from Indiana. Bailey says : "Lobes of leaves often 5-11," but none 

 of the leaves of my specimens have more than 3 lobes. Since the two species 

 have been confused by most authors I am not able to give the distribution 

 of our native hop, but probably it is nearly the same as that given by 

 authors for the exotic species which is as follows : 



