120 



THE AMERICAN BOTANIST 



KEY TO THE APETALOUS 



1 Shrubs and trees (2) 



2 Some of the flowers in catkins (3) 

 3 Staminate flowers, only, in catkins (4) 

 Leaves simple ; nuts in involucres. 

 Leaves pinnate ; nuts without involucre. 



S Both pistillate and staminate flowers in catkins (5) 

 5 Fruit fleshy, a sorosis. 

 5 Fruit dry (6) 

 6 Catkin globular. 



In racemes ; nutlets two-celled. 

 Solitary ; nutlets one-celled. 



6 Catkins cylindrical or oblong. 



Ovary many seeded ; seeds with pappus. 

 Ovary one-seeded. 



Ovary one-celled ; fruit often fleshy. 

 Two-celled ; fruit often winged. 



2 None of the flowers in catkins (7) 

 7 Leaves opposite (8) 

 8 Fruit a samara. 



Samara, double, two winged. 

 Samara, single. 



8 Fruit not a samara (9) 

 9 Fruit dry, three-seeded. 

 9 Fruit a drupe, or druplike. 

 Stamens two. 

 Stamens more numerous. 

 Three ; parasitic plants. 

 Four to eight ; not parasites. 



7 Leaves Alternate (10) 



10 Style or stigma, one. 



Calyx free from the ovary. 

 Anthers opening by valves. 

 Anthers not opening by valves. 

 Calyx adherent to the ovary. 

 Shrubs ; ovules two to four. 

 Trees ; ovule one. 

 Stamens four. 

 Stamens more. 

 10 Styles or stigmas, two or more (11) 

 11 Two, three or four. 



Fruit a samara or drupe. 

 Shrubs or vines. 

 Trees. 

 Fruit a capsule. 

 Two-celled. 

 Three-celled. 

 11 Five to nine. 

 Leaves simple. 

 Leaves pinnate. 



♦Numbers in parenthesis after family names, refe 

 Gray's and Britton's manuals, respectively 

 plant groups, see previous issues. 



DYCOTYLEDONS.* 



Fagaceae. (G. 337. B. 330) 

 Juglandaceae. (G. 330. B. 322) 



Moraceae. (G. 344. B. 339) 



Hamamelidaceae. (G. 452. B. 488) 

 Platanaceae. (G. 454. B. 490) 



Salicaceae. (G. 320. B. 307) 



Myricaceae. (G. 329. B. 320) 

 Betulaceae. (G. 332. B. 326) 



Aceraceae. (G. 557. B. 607) 

 Oleaceae. (G. 650. B. 723) 



Euphorbiaceae. (G. 540. B. 585) 



Oleaceae. (G. 650. B. 723) 



Loranthaceae. (G. 351. B. 344) 

 Eleagnaceae. (G. 590. B. 646) 



Lauraceae. (G. 413. B. 435) 

 Thymelaceae. (G. 589. B. 645 



Santalaceae. (G. 349. B. 345) 



Elaeagnaceae. (G. 590. B. 646) 

 Cornaceae. G. 623. B. 689) 



Rhamnaceae. (G. 561. B. 611) 

 Ulmaceae. (G. 344. B. 337) 



Hamamelidaceae. (G. 452. B. 488) 

 Euphorbiaceae. (G. 540. B. 585) 



Empetraceae. (G. 551. B. 598) 

 Rutaceae. (G. 537. B. 581) 



V to the pages in latest editions of 

 For keys covering the other great 



