ADDER'S TONGUE FAMILY 1039 



Spor0phyll and sterile leaf-blade with the apex or upper part bent down in the bud. 

 Sterile leaf-blade sessile or subsessile, once pinnately divided, the segments 



lunulate or fan-shaped. 2. B. Lunaria. 



Sterile leaf-blade usually stalked, entire to twice pinnately divided, the seg- 

 ments mostly oblong or ovate. 3. B. neglectum. 

 Sporophyll and sterile leaf-blade completely bent down in the bud; sterile leaf-blade 

 deltoid. 4. B. lanceolaturn. 

 Frond-bud hairy. 



Common stalk open along one side at base, usually long ; sterile leaf-blade sessile. 



5. B. virginianum. 



Common stalk completely closed at base, usually short; sterile leaf-blade stalked. 

 Sterile leaf-stalk 1-4 cm. long ; plant very stout and fleshy . 6. B. Coulteri. 



Sterile leaf-stalk usually 5 cm. long or more; plant not so fleshy, often slender. 



7. B. silaifolium. 



1. B. simplex Hitchc. Frond 3.5-20 cm. long; common stalk usually short; 

 sterile leaf-blade with a stalk 0.2-0.5 cm. long, oblong or deltoid or deltoid-ovate, 

 rounded, entire to twice pinnately or sometimes subternately subdivided; seg- 

 ments cuneiform or fan-shaped or rarely lunulate, rounded at apex; sporophyll 

 usually long-stalked. In grassy places and open woods : " N.S." -Me. " Md." 

 Wis Ont.; "Sask." -(?)" Alta." -Mont. Colo. Utah; Eu. Subm out Mont. 



2. B. Lunaria (L.) Sw. Frond 3-28 cm. long; sterile leaf-blade with the 

 apex bent down and clasping the sporophyll in the bud, oblong or rarely ovate 

 or deltoid-ovate, rounded above, once pinnately divided; segments fan-shaped 

 or lunulate or reniform, often imbricate, entire, or rarely radially incised or cleft 

 into cuneiform lobes; sporophyll with the apex bent down in the bud, 1-3 times 

 divided. Woods and grassy places: Greenl. P.E.I. "Vt." -N.Y. n Ohio- 

 Mont. Colo. Utah B.C. Alaska; Calif., Old World. Mont.Submont. 

 The var. onondagense (B. onondagense Underw.), which is distinguished by its 

 rather distant fan-shaped segments, is the form usually occurring in the United 

 States. 



3. B. neglectum Wood. Frond 5.5-32 cm. long: common stalk usually 

 long; sterile leaf with the upper part bent down in the bud, with a stalk 0.2-1.7 

 cm. long, oblong or sometimes deltoid, subacute, the primary divisions oblong 

 or ovate, the segments usually oblong, rounded at apex, entire or incised; sporo- 

 phyll with the upper part bent down in the bud, commonly diffusely branched. 

 Wooded places: Que. Md. "Ohio" -Wis.; (Black Hills) S.D.; Colo.; "B.C."; 

 Eu. Mont. 



4. B. lanceolatum (S. G. Gmel.) Angstr. Frond 5-30 cm. long; common 

 stalk long; sterile leaf -blade broadly deltoid, acute, 1-2 times pinnately or sub- 

 ternately divided, the primary divisions oblong to ovate or oblong-lanceolate, 

 the segments ovate, ovate-lanceolate or suboval, entire or incised; stalk of sporo- 

 phyll mostly shorter than the rather diffuse panicle; sporangia large, crowded, 

 sessile or broadly short-pedicelled. Woods and damp hillsides: Alaska "B.C." 



-Wash. Wyo.; "Greenl."; Old World. 



5. B. virginianum (L.) Sw. Frond 6.5-60 cm. long; sterile leaf -blade thin, 

 3-5 times divided, broadly deltoid, the subdivisions next to the last narrowly 

 oblong or lanceolate to ovate or deltoid, pinnately divided, the segments oblong, 

 blunt, incised; sporophyll mostly long-stalked. Wooded places: Que. Fla. 

 Tex. Colo. Ore. B.C.; trop. Am. and the Old World. Plain Mont. 



6. B. Coulteri Underw. Frond 12-26 cm. long; sterile leaf-blade broadly 

 deltoid to pentagonal, obtuse, about 4 times pinnately or subternately divided, 

 the primary divisions crowded and imbricate, oblong to deltoid, the subdivisions 

 next to the last oblong, pinnately divided into 2-5 pairs of oblique, broadly oblong 

 or ovate, mostly acute or subacute lateral segments, and with ovate to rhom- 

 boid subacute tips, the segments entire or undulate; panicle of the sporophyll 

 short and compact. Very close to the next and possibly only a form of it. Mostly 

 geyser formations: Ore. Mont. Wyo. Mont. 



7. B. silaifolium Presl. Frond 9.5-60 cm. long; sterile leaf -blade broadly 

 deltoid to pentagonal, acute or obtuse, 3-4 times pinnately or subternately di- 

 vided, the primary divisions oblong or oblong-lanceolate to deltoid or pentagonal, 

 the subdivisions next to the last oblong-lanceolate, pinnately divided into 2-5 

 pairs of oblique, oblong, narrowly elliptic, or sometimes ovate, decurrent lateral 



