KEY TO THE GENERA OF MANHATTAN PLANTS. 29 



243. Sicyos. Fruit ovate, flat, indehiscent, 1-celled, 1-seeded, prickly 

 with slender, easily detached, downwardly barbed bristles. 



244. Cucurbita. Fruit indehiscent, 1-celled, covered with a smooth, 

 hard rind. Seeds numerous on several parietal placentae. (Rind thin, 

 seeds contained in the dry and fibrous contents. Fruit ovoid or globose, 

 light yellow, 6-8 cm long ) 



Order 91. CAMPANULACEAE. 



Capsule many seeded, adherent to calyx tube. Herbs. 



245. Lobelia. Capsule 2-celled, dehiscing loculicidally across the upper 

 free portion. (Seeds i mm, oblong, papillose.) 



246. Campanula.. (Capsules clustered in wand-like spikes, 3-celled, 

 dehiscing by a circular hole near the top, opposite each partition ) 



247 Legouzia. (Capsules axillary, 1-celled with 1 parietal placenta, 

 or 2 or 3 celled with axil placentae. Sometimes tending to split from the 

 top ) 



Order 92. COMPOS1TAE. 



Akenes sessile in heads surrounded by a many-bracted involucre, 

 usually crowned by bristles, chaff or other appendages (the pappus), and 

 often with interspersed scales on the receptacle. Herbs 



KEY TO OUR GENERA. 



1 . Pappus of fine capillary bristles 2 



1 . Pappus not of capillary bristles * 20 



2. Pappus supported upon a narrow beak 3 



2 Akenes not narrow beaked 5 



3 Akenes very flat Lactuca 248 



3 Akenf s not flat, ribbed 4 



4. Oblong, ribs spinulose above, pappus white Taraxacum 249 



4. Fusiform, ribs not spinulose, pappus tawny Pyrrhopappus 2-50 



5 Involucral bracts spiny tipped, akenes flatfish, smooth. .Carduus 251 



5. Not spiny pointed 6 



6. Akenes flat or flatfish 7 



6. Akenes not flattened 10 



7. Involucral bracts in several rows 8 



7 Involucral bracts in 1 or 2 rows 9 



8. Tapering, squarrose; pappus of few deciduous bristles. . Grindelia 252 



8. Erect or spreading; pappus of numerous bristles Aster 253 



9. In 1 row Erigeron 254 



9. In 2 rows, inner equal, outer short and unequal Prenanthes 255 



10. Bracts thin and scarious 11 



10. Bracts not scarious 12 



11. Woolly Antennaria 256 



11. Smooth Anaphalis 257 



