98 



SYNOPSIS OF EXTERNAL ORGANS OF PLANTS. 



the semn formed by the union of those margins. Where there 

 are several pistils or carpels in one flower, and these soldered 

 together, we have, of com'se, a comjjound fnclt^ with several 

 cells, and even entire carpels may be, and often are, w^holly 

 suppressed or obliterated ; yet our theory enables us to com 

 prehend all such deviations from the normal structure or 

 original symmetry of the carpellary verticil."- 



SYNOPSIS OF THE EXTERNAL ORGANS OF PLANTS. 



112. 



Organs of nutrition, 

 or parts necessary 

 to the growth of 

 the plant. 



Organs of reproduc 

 tion, or parts of"( 

 fructification. 



Organs. 

 THE ROOT. 



THE STEM. 



THE BUD. 

 THE LEAF. 



APPENDAGES. 



THE FLOWER. 



THE FRUIT. 



Subdivisions. 



NECK OR ROOT-STALK, 

 CAUDEX, 

 RADICLES- 

 BRANCHES, 



PETIOLES, 

 PEDUNCLKS 



■^ spongioid. 



ShranclUets, 

 boughs. 



^ pedicels. 



LEAFLETS. 



STIPULES, 



PRICKLES, 



THORNS, 



GLANDS, 



STINGS, 



SCALES, 



TENDRILS, 



PUBBSCENCE, 



BRACTS. 



CALYX, 



COROLLA, 



NECTARY OR DISK 



STAMEN, 



PISTIL, 



' sepals or leaves. 



J petals. 



r part of the corolla., which some- 



? times appear as a separate 



( organ. 



S filament, 

 anther, — J pollen. 

 ( stigma, 

 I style, 

 ( ovary, — <( ovules. 



t Contains all parts of the fruit 

 which are not the seed, ai 

 cells, 

 I valves, 

 [ dissepiments. 

 f columella, 

 hilum., 

 albumen, 

 cotyledons, 



, S axis, 



embryo, \^^' 



plumule, 

 radicle. 



LECTUKE XYIII. 



PHYSIOLOGICAL VIEWS. GERMINATION OF THE SEED. 



113. "We liave traced the various organs of the plant through their successive 

 stages of development, from the root to the bud, leaf, and flower, and from the 

 flower to the fruit and seed. We have seen, in imagination, the vegetable world 

 fading under a change of temperature, the " sear and yellow leaf" becoming a prey 



* Darlington. 



Of compound fruits.— 112. Enumerate the organs of nutrition— Of rejjroduction— Parts of the root- 

 Stem— Bud— Leaf— Different kinds of appendages— Divisions of the calyx— Corolla— Nectary— Sta- 

 mens— Pistil— Parts of the fruit— What are the parts of the pericarp ?— Parts of the seed— Of the em- 

 htvo.— 113. Reflections. 



