72 
O Sterile blade inconspicuous, arising from above middle of sten, 
4 pinnatifid into a few irreguler thickish lobes 1, B. neglectum 
O Sterile blade fern-like, conspicuous, arising from near base of 
es decompound into many symmetrically arranged teeth 
. or divisions 
& Blade thin-textured, the ultimate segments acute, denticulates 
i bud pilose, emerging from a sheathing cavity near 
base of stalk 2e B, virginianim 
2 Blade thick-textured, even subcoriaceous, the ultimate segments 
( bluntish or obtuse, crenulates; bud hairy, emerging from 
\mear base of stalk, now sheathed Se Be multifidum 
1. B. neglectum Wood. Inconspicuous plants, the stems 5-15 cm, or more 
tall, often fleshy, simple, arising from a slender vertical rootstock, the 
sterile blades short-stalked, ovate-oblong in outline, commonly once pinnate 
or simply pinnatifid into 2-4 pairs of roundish or oblong-obtuse pinnae, the 
segments irregularly lobed; sporphyll usually bipinnate, the spores tuber- 
culate, 
Growing in sandy soils of shaded woods among grasses, where easily 
overlooked. So far known in our region only from Upper Priest R., 5000 ft,, 
Gs Eling 7457. This coll.) cited by Clausen as B,.matricariaefolium Braun, 
Giessen Qaligning our plants with that European species, 
2. B. virginianum (L.) Swartz, Rattlesnake Fern, Medium-sized fern=-like 
plants, the stems 30-45 cm, tall, arising from a slender vertical rootstock, 
the sterile blades ternate, borne lateral to the stalk, each division 
obliquely bipinnate, 12-15 cm. long, rather thin-textured, the pinnae arising 
obliquely, the ultimate segments cuneate-obovate, denticulate with acute 
teeth; sporophyll bipinnate, long-pedunculate, commonly borne well above 
the foliage. 
Occasional in deep woods of bottomlands, Priest R, drainage, 2700-3000 
feet, Epling 7175. Butters segregated var. occidentale upon sporangial characte) 
The type came from "deep woods near south end" of Lake Pend Oreille (Sandberg e7 
762 at Gray Herb.). 
