KEY TO THE GENERA OF MANHATTAN PLANTS. 17 



3. Capsule elongated, seeds in 1 row 4 



4. Capsule linear, flat, raceme elongated Cardamine. 74 



4. Capsule tapering upward, raceme short Dentaria. 75 



5. Valves nerveless, convex. Seeds small and numer- 



ous, globular (capsule oblong) Moripa. 76 



•5. Capsule strongly beaked, t-seeded or empty. Seeds 



globose in 1 row Brassica. 77 



5. Capsule cylindrical, not strongly beaked (closely ap- 



pressed to stem) Sisymbrium. 78 



5. As above but capsules erect on spreading pedicels Descurainia. 79 



6. Elliptical, turgid, style prominent ..Camelina. 80 



6. Triangular-obcordate; seeds numerous Bursa. 81 



6. Lenticular, 2 seeded Lepidium. 82 



6. Orbicular, with a wide wing; seeds few Thlaspi. 83 



Obder 36. CAPPARIDACEAE. 



Capsule 1-celled with 2 parietal placentae. Seeds kidney-shaped. 

 Herbs. 



84. Polanisia. Capsule sessile in the calyx, (glandular pubescent, 

 flattish. Dehiscent at apex where valves separate from placentae). 



85. Cleome. Cip3ule raised on a (2 cm) stipe, (glabrous, terete but 

 somewhat knotty. Valves completely separating from placentae). 



Order 37. CRASSULACEAE. 



86. Peatkorum. Capsules 5 (4-6) celled, the cells extending upwards 

 into a beak Calyx partially adnate to ovary. Dehiscence by the beaks 

 and sides falling away from the center and partitions. Seeds small and 

 very numerous. 



Order 38. SAXIFRAGACEAE. 



87. Ribes. Berry globose, 1-celled, many seeded; placentae, parietal; 

 superior. Shrubs. 



calyx superior. 



Order 39. PLATAN ACE AE. 



88. Platanus. Fruit 1-celled, 1-seeded. indehiscent, coriaceous, club- 

 shaped, sessile in dense, peduncled heads, furnished with a copious 

 cluster of tawny hairs at base. Trees. 



Order 40. ROSACEAE. 



Pistils 1 to many in each flower, simple. Fruit various, drupe, 

 follicle, akene, or aggregation of drupelets. Herbs, shrubs, or trees. 



89. Pyrus Fruit a pome, the 2-5 carpels sunk in the receptacle 

 which completely encloses them, and more or less united with each 

 other. Receptacle fleshy, pericarp cartilaginous (the core), each 

 carpel 2-seeded (pome greenish, 2 cm or more). Trees. 



