KEY TO THE FAMILIES 9 



Plant parasitic; fruit berry-like. 125. Loranthaceae 221 



2. Flowers, at least the staminate, not in aments. 

 a. Ovary superior. 



Gynoecium of 1, or several and distinct carpels; stigma and style of 

 each solitary. 



Carpel solitary. 



Ovary neither enclosed nor seated in a hypantliium or a calyx- 

 tube. 

 Flowers not solitary in the axils of the leaves; land plants. 

 Plants with scarious stipules; flowers cymose. 



43. CORRIGIOLACEAE. 81 



Plants not with scarious stipules; flowers clustered. 



36. Urticaceae 66 

 Flowers solitary in the axils of the leaves; aquatic plants. 



46. Ceratophyllaceae 86 

 Ovary enclosed in or seated in a hypanthium or a calyx-tube. 

 Stamens borne under the gynoecium; calyx corolla— like; 



herbs. 40. Nyctaginiaceae 78 



Stamens borne on the hypanthium or adnate to the calyx- 

 tube; calyx not corolla-like; shrubs. 

 Hypanthium becormng fleshy in fruit, enclosing the 

 tafl-less achenes; calyx 4-merous; stamens 4 or 8; 

 leaves silvery -sciu-fy. 89. Elaeagnaceae 160 



Hypantliium not becoming fleshy; achenes tailed; 

 calyx 5-merous; leaves not scurfy. {Coleogyne and 

 Cercocarpus in) 60. Rosaceae 116 



Carpels several. 



Stamens inserted belowTthe ovary. 



(Genera in) 48. Ranunculaceae 86 



Stamens inserted on the edge of a cup-shaped hypanthium. 



(Genera in) 60. Ros.\ceae 116 



Gynoecium of 2 or several united carpels; stigmas or styles 2 or several. 



Ovary, by abortion, 1-celled and 1-ovuled. 



Leaves with sheathing stipules (ocreae). 



37. POLYGONACEAE 66 



Leaves estipulate, or stipules, if present, not sheatliing. 

 Trees or shrubs; ovary not seated in a hypanthium. 



34. Ulmaceae 65 

 Herbs or vines. 



Stipules herbaceous; inflorescence spicate or racemose; 

 leaf-blades palmately veined. 



35. Cannabinaceae 66 

 Stipules scarious, or hyaline, or none: inflorescence 



cymose: leaf-blades pinnately veined. 

 Fruit a utricle, or achene, circumscissile or burstmg 

 irregularly. 

 Stipules wanting. 



Flowers subtended by an involucre formed 

 by more or less united bracts. 



37. Poly'gonaceae 66 

 Flowers not involucrate. 



Bracts not scarious. 



38. CHENOPODIACE-AE 74 



Bracts scarious. 39. Amakanthaceae 78 



Stipules present, scarious. 



43. Corrigiol.\ceae 81 



Fruit a capsule, deliiscent by apical or longitudinal 



valves. 44. Alsin.aceae si 



Ovary several-celled, or with several placentae, several-ovuled. 



Stamens hypogynous, inserted under the gynoecium in the per- 

 fect flowers, not on a disk in the staminate flowers. 

 Flowers perfect. 



Stamens not tetradynamous. 



Stamens 2; inflorescence spicate. 



{Besseya in) 117. Scrophulariaceae 206 

 Stamens 3-10; inflorescence cymose or axillary. 

 Ovary 1-celled. 



Placentae parietal; pistils 2-carpillary. 



57. S.axifragaceae 110 



Placentae central or basal; pistils of 3-5 car- 

 pels. 

 Calyx not petaloid, of 4 or 5 distinct sep- 

 als. 44. Alsinaceae 81 

 Caly.x more or less petaloid, campanulate, 

 merely 5-lobed. 



(Glaux in) 100. Primulaceae 117 



Ovary 3-5-celled; leaves verticillate. 



41. Tetragoniace.ve 80 



