3So REPORT OF NEW JERSEY STATE MUSEUM. 



Sub-Class II. DICOTYLEDONES. 



Key to the Groups. 



a. Insectivorous plants, usually somewhat suffused with crimson. 

 b. Leaves cup-like, lined on the inside with reflexed bristles. 



Sarraceniaccc, p. 467 

 bb. Leaves slender; covered with glandular, sticky hairs. 



Droseracecc, p. 467 

 aa. Parasitic plants. 



b. Growing on the branches of trees, yellowish-green with inconspic- 

 uous flowers and globular, somewhat translucent, white berries. 



Loranthacece, p. 416 

 bb. Growing from the roots of trees, shrubs or herbs, devoid of green 

 coloring. 

 c. Corolla of 4-5 separate petals, plant white or yellowish, some- 

 what tinged with pink, resembHng a fungus. 



Monotropacecs, p. 611 

 cc. Corolla tubular, more or less two-lipped, plant brown or yel- 

 lowish. OrobanchacecE, p. 694 

 bbb. Growing on bushes or herbs, a trailing vine with naked orange 

 stem. Cuscutacecc, p. 654 

 aaa. Plants neither insectivorous nor obviously parasitic. 



b. Plants aquatic or semi-aquatic; floating, submerged or creeping 



on mud. p. 380 



bb. Plants with woody stems, i. e., trees, shrubs and woody climbing 



vines. p. 381 



bbb. Plants with herbaceous stems, i. e., herbs and vines with herbaceous 



stems. p. 385 



AQUATIC OR SEMI-AQUATIC DICOTYLEDENOUS PEANTS. 



a. Some or all of the leaves entire, undivided, floating on the surface of 

 the water. 

 b. Leaf-blades at least 25 mm. in length, often much more. 



c. Flowers on separate pedicels, large or medium sized, white, 



yellow or purplish. Nymphceacea, p. 443 



cc. Flowers small, in a cluster at the base of the floating leaf ; 



white or yellow. Limnanthemum, p. 644 



ccc. Flowers small, in a short, erect spike, pink. Polygonum, p. 419 



bb. Leaves small, much less than 25 mm. long, flowers minute, greenish. 



Callitriche, p. 529 



aa. None of the leaves floating on the surface, most of the plant submerged, 



leaves finely divided, usually into linear or filiform segments. 



b. Leaf-segments bearing little bladders ; flowers conspicuous yellow or 



purple, irregular and spurred, raised above the surface, several on 



a slender scape. Utricularia, p. 688 



hb. No bladders present. 



