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SCIENTIFIC AND POPULAR. 141 



711. DRYOPETALON, Gray. (Dryopetalum). Cruciferae. 

 Herb. One species, New Mexico. 



712. DRY6pTERIS, Adans. 1763. Shield Fern. Polypodiaceae. 



From Greek, ''oak fern", alluding to forest habitat. Syn. 

 Aspidium Swz. 1800; Polystichum, Nephrodium, Acrostichumf,. 

 Polypodiumf, in part. About 350 species; 27 in U. S. 



a. D. acrostichoides (Michx.) Kze. (N. acrostichoides Michx., 

 Asp. acrostichoides Swz.). Canada and eastern U. S. Christ- 

 mas Fern, Holly Fern. 



y^.B, Filix-Mas (L.) Schott (Polypodium Filix-Mas, L.,Asp. 

 Filix-Mas, Swz., Polystichum Filix-Mas, Koth. ). Almost cos- 

 mopolitan (northern U. S. ). Male Fern, Male Shield-fern, 

 Basket Fern, Bear's-paw root. Knotty Brake, Sweet Brake; 

 Ger. Wurmfarn, Waldfarn, Johanniswurzel; Fr. Fougere male 

 (Codex); Sp.Helecho macho. Rhizome of this and of (c); 

 Aspidium, U. S. P., Filix-Mas, Br., Rhizoma filicis, Ead. 

 filicis (maris) ; anthelmintic, taenicide. 



c. D. niarginalis (L. ) A. Gray (Polypodium marginale L., Asp. 



marginale Swz. , IST. marginale Michx.). British America, 

 south to Alabama and Arkansas. Evergreen Wood-fern, Mar- 

 ginal-fruited Shield- fern^. Properties of (b). 



d. D. spinulosa (Retz. ) Kze. (Polypodium spinulosum Retz.,. 



Asp. spinulosum Swz.). Northern Europe, Asia and N. Ame- 

 rica. Common Wood-fern. 



e. D. Thelypteris (L.) A. Gray (Acros. Thelypteris L., Asp. 



Thelypteris Swz. ). Europe, Asia and N. America (eastern 

 U. S. ). Marsh Shield-fern, Fragrant Meadow-fern, Quill Fern,. 

 Female Fern*; Marsh, Meadow or Swamp Fern. 



713. DRYPETES, Vahl. Drypetes. Euphorbiaceae. 



Syn. Xylosma, in part. Trees or shrubs. About 8 species, 

 warmer regions of New World; 3 in U. S. 



a. D. crocea Poit. (X. nitidum Gray). West Indies to Florida 

 and S. America. Guiana Plum, White- woodr. 



714. DUBOiSIA, R. Br. Pituri, etc. Solanaceae. 



Named for F. N. A. Dubois, French botanist, d. 1824. 

 Shrubs. About 3 species, Australia and adjacent islands. 



a. D. Hopwoodii F. Muell. Australia. Pituri ( Pitury, Pitchuri, 



Pedgery, Bedgery). Leaves contain an alkaloid, piturirje, 

 different in action from duboisine. 



b. 1). myoporoides R. Br. Eastern Australia and New Caledonia. 



Corkwood Elm, Orungurabie, Ngmoo, Duboisia. Leaves con- 

 tain a mydriatic alkaloid, duboisine (hyoscyamine. ) 



715. DUCHESNEA, J. E. Sm. Mock Strawberry. Rosaceae. 

 Named for A. N. Duchesne, French botanist. Syn. Fragariar 



in part. Perennial herbs resembling Fragaria but with insipid 

 fruit. Two species, southern Asia; 1 nat. in U. S. , (a) D. 

 Indica (Andr. ) Focke, called also Indian or Yellow Straw- 

 berry. 



