11 



12 



ions of sterile frond arranged nearly 

 perpendicularly. Ct; NY; Mich; Colo; BC. 

 B: BOREAX.IT Milde. 



Plant 2Y2-T hi, smooth, fleshy; sterile 

 seg placed above the middle, sessile, 

 cordate, ovate or deltoid, pinnately 

 parted, acute; lowest seg spreading from 

 a narrower base, ovate or cordate-ovate, 

 acute, all entire, or here and there 

 flabellately incised with acute lobes, or 

 pinnately parted; secondary seg from a 

 narrowed base, ovate, acute, serrate, the 

 upper spreading, quickly decreasing, 

 finals elliptical, acute; fertile seg bi-tri- 

 pinnate, panicled. Apex of sterile seg 

 bent over inside of the nearly erect 

 fertile one in vernation; division of the 

 sterile seg arranged on an angle. Un- 



B: HEGX.ECTUM Wood. 



Plant 2-12' hi, usually fleshy; sterile 

 seg placed above the middle, short 

 stalked or sessile, ovate or oblong, pin- 

 nateiv parted into ovate-oblong, obtuse, 

 rounded, entire, incised, pinnatifid, or 

 pinnately parted seg, the narrow divis- 

 ions linear; fertile seg 1-3-pinnate, pani- 

 cled, often very much branched; spores 

 thickly covered with large rounded 

 warts. Apex of both segments turned 

 down in vernation; sterile seg clasping 

 the fertile with its apex overlapping the 

 whole. New England; NY; Ohio; Mt 

 Peddo, Washington (Suksdorf). Syn- 

 onym: B. matricarlaefolium A. Br. fide 

 recent authors. 



**II. — Buds pilose; sterile seg usually 

 long-stalked; plant larger, fr'ng in 

 autumn. 



3: TERNATtTM Swz. 



Frond fleshy, the common stalk very 

 phort; sterile seg broadly pentagonal or 

 triangular, ternate; the 3 primary divis- 

 ions also stalked, as broad as long, pin- 

 nately decompound; ultimate divisions 

 varying from round-renifo^m to triangu- 

 ■"or-lanceolate, entire or variously toothed 

 and incised; fertile seg long-stalked, bi- 

 uadri-pinnate. Apex of both seg bent 

 down, with a slight curve inward in ver- 

 nation. New England; Canada; BC; Fla; 

 Wash: Cal. Synonyms: B: australe R. 

 "r. — B: lunarioides Swz. — B: fumarioides 

 Willd. — B: decompositum Mart & Gale. — 

 Osmunda ternata Humboldt. — Botrypus 

 •unarioides Mich. 

 Variety OEI.XQUUM Milde. 



Form 6-17' hi, with more compound 

 fructification and with divisions of ster- 

 ile see: oblong or lanceolate and obtuse 

 ^r oblique at base. 

 Variety DISSECTUM Milde. 



Form with divisions of sterile seg la- 

 riniately cut into narrow teeth. 

 ***Vernation wholly inclined, in the f er- 

 ne seg - recurved. 

 3: JjANCEOIjATUM Angst. 



Plant 3-9' hi. somewhat fleshy; sterile 

 ^eg closely sessile at top of a long com- 

 "ion stalk, in the smallest forms 3-lobed, 

 in larger ones broadly triangular, twice 

 pinnatified, the divisions lanceolate, en- 

 tire or toothed, all set at an oblique 

 angle; fertile seg short-stalked, slightly 

 overtopping the sterile, bi-tri-pinnate. 

 Bud smooth; fertile seg recurved its 

 whole length, the shorter sterile seg 



reclined upon it. New England; Colo; 

 ■A.T. st s It Sf 



Section OSMUNDOPTERXS. Bud pilose,, 

 enclosed in a smooth upright cavity at 

 one side of the lower part of the stalk. 

 B: VIRGINIANUM Swz. 



Rattlesnake fern. Plant from a few 

 Inches to 2° hi; sterile seg sessile above 

 the middle of the stalk, broadly triangu- 

 lar, thinly herbaceous, ternate; the short- 

 stalked primary divisions once to twice 

 pinnate, thence once or twice pinnatifid; 

 lobes oblong, cut-toothed toward apex; 

 fertile seg long-stalked, bi-tri-pinnate. 

 Bud pilose, enclosed in a smooth up- 

 right cavity at one side of the lower 

 part of stalk; fertile seg recurved its 

 whole length, the longer sterile segs re- 

 clined upon it. New Brunswick to Flar 

 Arizona; Cal. Synonyms: B. gracile- 

 Pursh (a reduced form). Botrypus Vir- 

 ginicus Michx. — Osmunda Virginica L, 



Other species of Botrychium credited 

 to North America north of Mexico, are 1 

 the following: 



B: BITERNATXJM (Lam.) Underwood.. 



B: COUXiTERI Underwood. 



B: DISSECTUM Spreng. 



B: MATRICARIAE (Schrank) Spreng'. 



B: OBXiIQUXTM Muhl. 



Variety INTERMEDIUM (D. C. Eaton > 

 Underwood. 



B: OCCIDENT AX«E Underwood. 



B: PU MIC OLA Coville. 



B: SILAIFOLIUM Presl. 



B: TENEBROSTJM A. A. Eaton. 



CHElROGIiOSSA Presl. 



Fertile spikes several, arising from 

 the base of sterile seg. Treated in the 

 past by many botanists as a section of 

 Ophioglossum, and monotypic, based on 

 the Linnaean Ophioglossum palmatum. 

 C: P Alt MAT A (L) Presl. 



Rootstalk fleshy, tuberous, covered 

 with fine wool-like chaff; plant fleshy, 

 6'-2° hi, the sterile seg cuneate at base, 

 2-fi-lobed or rarely entire, lobes elongate 

 and tapering; fertile spikes y s or more, 

 borne on the sides of the stipe just be- 

 low the sterile seg on its margin. Fla. 

 OPHIOGXiASSXTM L. 



Fertile, spike single, arising from the 

 base of sterile seg'. 



*Sterile portion near the middle of 

 stalk. 



O: VULGATUM L. 



Rtstalk short, oblique; stalk 6-12' hi, 

 sterile seg ovate or elliptical-oblong, 

 li£-4' long, somewhat fleshy, somewhat 

 narrowed at base, sessile; fertile spike 

 V or more long. Me to Ky; Tenn; Tex; 

 Arizona; Alaska. Synonym: O. Engel- 

 manni PrantI (fide Underwood). Adder- 

 Tongue. 



**Sterile portion near base of stalks. 

 O: CROTAXiOPHOROIDES Walt. 



Rtstalk tuberous, 3-5" thick; stalk 3-6' 

 hi, sterile seg 1 /£-l r long, ovate, slightly 

 petioled, veins somewhat indistinct; fer- 

 tile spike short and thick, 3-6" long. Fla 

 to La. Synonj'ms: O. bulbosum Michx. — 

 O. vulgatum Crotalophoroides D. C. 

 Eaton (all fide Underwood). 

 O: NUDICAUIiE Linnaeus f. 



Rtstalk slightly tuberous; stalk 1-4' hi, 

 sterile seg V2-IV2' lortg, ovate or oblong. 



