GENUS 20. 



EVENING-PRIMROSE FAAIILY. 



611 



Plant i-2 high ; leaves ovate; hairs of the 2-celled fruit stiff. 

 Plant 3'-8' high ; leaves cordate ; hairs of the i -celled fruit weak. 



1. C. lutetiana. 



2. C. alpina. 



Enchanter's Nightshade. Fig. 3074. 



i. Circaea lutetiana L. 



Circaea lutetiana L. Sp. PI. 9. 1753. 



Erect, branching, finely pubescent, 

 at least above ; stem swollen at the 

 nodes, i-2 high. Leaves slender- 

 petioled, ovate, acuminate at the apex, 

 rounded or rarely slightly cordate at 

 the base, remotely denticulate, 2'-^ 

 long; pedicels 2"~4" long, slender, 

 spreading in flower, reflexed in fruit; 

 bracts deciduous or none ; flowers 

 about li" broad; fruit broadly obo- 

 void, nearly 2" long, 2-celled, densely 

 covered, with stiff hooked hairs, or 

 rarely glabrous. 



In woods, Nova Scotia to western 

 Ontario, North Dakota, Georgia, Ne- 

 braska and Kansas. Also in Europe and 

 Asia. Ascends to 2000 ft. in Virginia. 

 Bindweed-nightshade. Mandrake. June 

 Aug. The specific name is from Lutetia, 

 the ancient name of the City of Paris, 

 France. 



Circaea intermedia Ehrh. has thin- 

 ner, strongly toothed leaves, some of 

 them cordate, and ranges from Quebec 

 to Michigan, New Hampshire and Ohio, 

 and is recorded from Tennessee. 



2. Circaea alpina L. Smaller Enchanter's 

 Nightshade. Fig. 3075. 



Circaea alpina L. Sp. PI. 9. 1753. 



Smaller, 3'-8' high, simple or branched, weak, 

 glabrate, or pubescent above. Leaves ovate, 

 slender-petioled, acute or acuminate at the apex, 

 more or less cordate at the base, coarsely den- 

 tate, I '-2' long; flowers about i" broad; pedicels 

 ii"-2" long, reflexed in fruit; fruit narrowly 

 obovoid, i-celled, about i" long, covered with 

 weak soft hooked hairs. 



In cold moist woods, Labrador to Alaska, south 

 to Georgia, Indiana, Iowa, Michigan and South 

 Dakota. Also in Europe and Asia. Leaves thin, 

 somewhat shining. Ascends to 6300 ft. in North 

 Carolina. July-Sept. 



Family 99. TRAPACEAE Dumort, Fl. Belg. 90. 1827. 



WATER-NUT FAMILY. 



Aquatic herbs, with opposite or verticillate pinnatifid submerged leaves, and 

 clustered rhombic-ovate dentate floating ones with inflated petioles. Flowers per- 

 fect, axillary, solitary, short-peduncled. Calyx-tube short, the limb 4-parted, the 

 lobes persistent. Petals 4, sessile, inserted on the perigynous disk. Stamens 4, 

 inserted with the petals ; filaments subulate-filiform. Ovary 2-celled, conic above ; 

 style subulate ; ovule i in each cavity. Fruit coriaceous or bony, large, 2-4-spinose 

 or swollen at the middle, i-celled, i-seeded, indehiscent. Seed inverted. 



A single genus of 3 species, natives of Europe, tropical Asia and Africa. 



i. TRAPA L. Sp. PI. 120. 1753. 



Characters of the family. [Latin, calcitrapa, the caltrop.] Type species: Trafa ttatans L. 



