FLOWERING PLANTS AND FERNS OF ARIZONA 25 



1. OPHIOGLOSSUM. Adderstoxgue 



Mostly small terrestrial herbs, the rhizome ending in an erect 

 exposed bud; leaves erect; sterile blade simple, entire, linear-lanceo- 

 late to ovate, with reticulate venation, the areoles simple or compound ; 

 sporophyll a simple, slender, long-stalked spike, the large globose 

 sporangia coalescent in two ranks. 



Key to the species 



1. Fronds usually solitary; sterile blade with a pale median band, not apiculate; 

 areoles small, numerous 1. O. vulgatum. 



1. Fronds two or several; sterile blade lacking a median band, apiculate; areoles 

 large, including numerous secondary ones 2. O. engelmannii. 



1. Ophioglossum vulgatum L., Sp. PL 1062. 1753. 



A single specimen, said to have been collected in the Huachuca 

 Mountains, is cited by Clausen (Mem. Torrey Bot. Club 19: 126. 

 1938). Prince Edward Island to Alaska, south to northern Florida, 

 the Gulf States, Texas, Arizona, and Mexico; Eurasia. 



2. Ophioglossum engelmannii Prantl, Ber. Deut. Bot. Gesell. 1: 351. 



1883. 

 Huachuca Mountains and near Hereford (western Cochise County), 

 Mustang Mountains and Sonoita Valley (Santa Cruz County), 4,000 

 feet or higher, in damp places, usually in calcareous soil. Virginia to 

 Missouri, Florida, Louisiana, Texas, Arizona, and Mexico. 



2. BOTRYCHIUM. Grapefern 



Succulent terrestrial herbs; rhizome erect, the bud for the following 

 year wholly or partially enclosed in the base of the common stalk; 

 leaves erect, 1 to 3; sterile blade 1 to 3 times pinnately or ternately 

 divided or compound, the divisions small, with free veins; sporophyll 

 solitary, usually a long-stalked, 1- to 5-pinnate panicle, the large 

 globose sporangia sessile or nearly so, free. 



Key to the species 



1. Sterile blades large, ternately decompound, membranous; bud at base of 



common stalk partially exposed, pilose 1. B. virgixiaxfm. 



1. Sterile blades small, once or twice pinnately divided, fleshy; bud completely 

 enclosed in base of common stalk, glabrous (2). 

 2. Blades deltoid, acute, once or twice pinnately divided, the segments narrow 

 and acute; sterile blade and sporophyll bent down in vernation. 



2. B. LANCEOLATUM. 



2. Blades oblong or triangular-oblong, once pinnate, the segments flabelliform 

 to lunate or reniform; sterile blade and sporophyll erect in vernation. 



3. B. LUNARIA. 



1. Botrychium virginianum (L.) Swartz, Jour. Bot. Schrad. 1800 '-': 



111. 1801. 



Osmunda virginiana L., Sp. PI. 1064. 1753. 



Santa Rita Mountains (Pringle). Prince Edward Island and New 

 Brunswick to British Columbia, south to Florida, the Gulf State-. 

 Arizona, and Mexico; Eurasia. 



