INDEX. 355 



Nicandra, scarcely distinct from Physalis . . 72 



O. 



Oak (Quercus), the genus of ... 193 



Oat (Avena), how characterized ... 54 



Octandria Class . . . . . .95 



Orders, of the Lirmaean System . . . 35 — 40 



Orchard fruits, their original country . . .27 



Orchard-grass (Dactylus), tlir genus of . . 54 



Orchis, the genus of, and some of the species . . 181 



Ox-eye Daisy, &.c. (Chrysanthemum), the genus of 171 



P. 



Painted-Cup (Euchioma or Bartsia), the genus . 134 



Papilionaceous Flowers or Leguminos^; . . 10 



Parnassus grass of (Parnassia), the genus . . 81 



Partridge-berry (Mitchella), the genus . . .61 



Passion-flower (Passiflora), the genus, and native species 142 

 Pavia, the American section of the Horse Chesnut genus 95 

 Pea (Pisum), the genus of . . . 153 



the flower and fruit of, . . . 10, 11 



Peloria, an example of the personate corolla reduced to a 



regular form ..... 16 k 125 



Peony (Pa5onia), the genus .... 120 



Pentstemon, the character of the genus . . 132 



Pentandria Class ..... 64 



— Second order (Digynia), . . . .75 



Personate flowers, sometimes possessed of a rudimental 



5th stamen ..... 47 



Petalostemon, a papilionaceous flower with only 5 stamens 



and 5 oblong petals . . . 13 & 148 



"hlox or Lychuidea, how distinguished . .70 



"ink (Dianlhus), the genus, how distinguished from Sa- 



ponaria ...... 107 



Mpsisseway (Chimaphila), the genus of . . . 107 



ine and Fir-tree (Pinus), the genus of . . 196 



remarks on the natural character of, and on some of 



the species . . . . . 197 



^ith or Medulla, its situation and character . . 269 



its form in different plants — generally constituting a 



continuous column, in others presenting hollows sepa- 

 rated by diaphragms, [v. Plate 12, Fig. 3.] . ib. 



sometimes broken by ligneous plates . . 270 



Pith consists of hexagonal cells — generally destitute of 



vessels — its functions little important to the perfection 



of the vegetable . . . . . 271 



its uses conjectured .... 272 



Plane or Button-wood (Platanus), the genus . 195 



