14 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Flowers not in involucrate heads. 
Fruit either a berry or a drupe or nutlike. 
Stamens as many as the perianth segments and alternate 
with them or else fewer. 
(Tetragoniaceae) 24, CHENOPODIALES (p. 198). 
Stamens as many as the perianth segments and opposite 
them or else twice as many. 
(Families of) 87. MYRTALES (p. 459). 
Fruit a capsule. 
Sepals as many as the cells of the ovary or half as many. 
37. MYRTALES (p. 459). 
Sepals (4 or 5) at least twice as many as the cells of the 
Ovary....... (Saxifragaceae) 27. ROSALES (p. 291). 
Ovary superior. 
Gyncecium of 1 carpel or several distinct carpels; stigma and styles 
of each solitary. 
Carpels several. 
Stamens inserted below the ovary. 
(Families of) 25. RANALES (p. 243). 
Stamens inserted on the edge of a cup-shaped hypanthium. 
(Families of) 27. ROSALES (p. 291). 
Carpels solitary. 
Style lateral and oblique. 
(Phytolaccaceae) 24. CHENOPODIALES (p. 198). 
Style axile, erect. 
Ovary neither inclosed nor seated in a hypanthium ora 
calyx tube. 
Flowers solitary in the axils of the leaves; aquatics. 
(Ceratophyllaceae) 25. RANALES (p. 243). 
Flowers not solitary in the axils of the leaves; terres- 
trial plants. (Urticaceae) 20, URTICALES (p. 174). 
Ovary inclosed in or seated in a hypanthium or a calyx 
tube. 
Stamens borne under the gyneecium. 
(Allioniaceae) 24. CHENOPODIALES (p. 198). 
Stamens borne on the hypanthium or adnate to the 
calyx tube....... 36. THYMELAEALES (p. 458). 
Gyneecium of 2 or several united carpels; stigmas or styles 2 to 
several, 
Ovary, by abortion, 1-celled and 1-ovuled. 
Leaves with sheathing stipules. 
23. POLYGONALES (p. 181). 
Leaves exstipulate, or the stipules, if present, not sheathing. 
Trees or shrubs... .(Ulmaceae) 20, URTICALES (p. 174). 
Herbs or vines. 
Stipules herbaceous; inflorescence spicate or racemose; 
leaf blades palmately veined. 
(Cannabinaceae) 20. URTICALES (p. 174). 
Stipules scarious or hyaline or none; inflorescence 
cymose; leaf blades pinnately veined. 
(Families of) 24. CHENOPODIALES (p. 198). 
Ovary several-celled, or with several placente, several-ovuled. 
Stamens perigynous or epigynous, inserted on the margin 
of a hypanthium or a disk. 
Fruit a samara...(Aceraceae) 31. SAPINDALES (p. 405). 
