400 



Urticaceae Boehmeria 



serrate or the margins of the lower leaves are sometimes entire ; the fruits 

 vary in size and in the amount of brown markings and are of a greenish 

 color. My no. 48006 from Crawford County, Oct. 2, 1929, and two just 

 like it from Clark County have purplish fruits, but the inside of the peri- 

 carp is white and they lack the white margins of Piled fontana. 



In a dry season I collected in the bottom of a pond a sheet of depauper- 

 ate plants only a few inches high. These were named for me by a special- 

 ist as typical Pilea pumila (L.) Gray. Two years later I revisited the 

 same pond when it was full of water and I found only large plants about 

 the pond. Like all annuals delayed germination or lack of moisture pro- 

 duces small or dwarf plants. 



My collection of 132 sheets from Indiana shows the above variations and 

 others not mentioned. 



Que., e. Canada to Minn., southw. to Fla. and Tex. 



2. Pilea fontana (Lunell) Rydb. (Adicea fontana Lunell.) Map 815. 

 Found in favorable habitats probably throughout the state although its 

 habitat is rarely found south of the lake area. This species grows only 

 in very wet, springy, and boggy places, usually on the borders of lakes 

 and streams. It commonly forms dense stands and usually is 6-12 inches 

 high although I have a specimen more than 3 feet high. One of its favorite 

 habitats is among dead or live cattails. This species can easily be sepa- 

 rated from the preceding species by the white margin of the fruit and the 

 purple color of the inside of the pericarp. It has not been recognized 

 for a time long enough to ascertain its range. 



P. E. I. to N. Dak., southw. to Fla. and Nebr. 



1990. BOEHMERIA Jacq. 



Leaves mostly broadly ovate, ascending, not folded, generally long-acuminate, smooth, 

 smoothish or somewhat scabrous above; petioles of median leaves (20) 25-80 mm 

 long; achenes generally yellowish green, without purplish splotches, the body 

 usually glabrous 1. B. cylindrica. 



Leaves narrowly ovate or ovate-lanceolate, some or all drooping and generally more 

 or less folded, somewhat scabrous above; petioles of median leaves (3) 5-20 (25) 

 mm long; achenes more or less splotched with purple, the wings and usually the 

 body with uncinate hairs la. B. cylindrica var. Drummondiana. 



1. Boehmeria cylindrica (L.) Sw. False Nettle. Map 816. Infrequent 

 to frequent throughout the state in low places in woodlands and less fre- 

 quent in marshes and wet prairies. 



Maine, Ont. to Minn., southw. to Fla. and Tex. 



la. Boehmeria cylindrica var. Drummondiana Weddell. {Boehmeria 

 cylindrica var. scabra Porter of Gray, Man., ed. 7.) Droopingleaf False 

 Nettle. Map 817. Infrequent to locally frequent in the lake area in open 

 marshes, infrequent to local in wet places in woods and wet prairies, and 

 rare in low places in woods or in springy places in the southern part of the 

 state. It is to be noted that this variety intergrades into the species and in- 



