16 KEY TO THE GENERA OF MANHATTAN PLANTS- 



Order 32. RANUNCULACEAE. 



Fruit a single carpel. (An akene or follicle, more than 1 to each 

 flower.) Herbs. 



61. Aquilegia. Follicles 5 (or -1) erect. Seeds numerous (smooth). 



62. Delphinium. Follicles erect (3). Seeds numerous (deeply reticu- 

 lated). 



63. Anemone. Akenes numerous, flattened, pointed, but not plumose 

 tailed, from slightly pubescent to densely woolly. (Style not much longer 

 than the body.) 



64. Clematis. Akenes numerous, long-tailed, margined. Vines. 



65. Myosurus. Akenes numerous on a much elonga ed receptacle 

 (flat, quadrangular, with a ridge on back extending up into a beak). 



66. Ranunculus. Akenes numerous in a globose or oblong head 

 (glabrous, lenticular, more or less obliquely beaked) 



67. Thalictrum. Akenes few, ribbed, scarcely flattened. 



Order 33. MENISFERMACEAE. 



68. Menispermum. Drupe globular, 1-seeded, stigma scar near base. 

 Stone disc-shaped, thicker at the edges than in the middle. Woody vine. 



Order 34. PAPAVERACEAE 



Fruitdry, 1-celled ; placentae parietal, (dehiscent; seeds numerous.) 

 Herbs. 



69. Argemone. Capsule prickly (4-5 valved from the top along the 

 sutures, placentae extending upward and persistent with the stigma 

 after the separation of the valves. Seeds globose). 



70. Bicuculla. Placentae 2, capsule dehiscing along the sutures. 

 Seeds crested (black, shining, slightly pitted). 



71. Gapnoides. (Differs from Bicuculla in having the capsule more 

 slender, 1 cm long, H mm wide, and torulose). 



Order 35. CRUCIFERAE. 



Fruit a 2-carpelled capsule, 2-celled by a false partition extending 

 between the 2 parietal placentae, dehiscing by the separation of the 

 2 valves from the partition. Herbs. 



KEY TO OUR GENERA. 



1. Capsule more or less elongated, flattened parallel to partition 2 



1. Capsule elongated, terete or 4-angled 5 



1. Capsule short, flattened contrary to partition 6 



2. Valves nerveless 3 



2. Valves 1-nerved, flat, linear, sometimes curved, seeds 



(in 1 row) flat, margined or winged Arabis. 72 



3. Capsule oval-oblong, ends rounded, seeds in 2 rows, 



(flat, minutely pitted) Ih-aba. 73 



