80 



PBACTIOAL BOTANY. 



III. 



ORGANOGRAPHY. 



69. Plants (organized bodies) consist of organs. 

 Tlieso organs are distingnished into — 1. Simple, or ele- 

 mentary prgam,s, which, are the most important of all, 

 since they constitute all the solid parts of a plant : usually 

 they are minute, and not perceptible without the aid of a 

 microscope. 2. Compound, or externo^ organs, which are 

 formed of combinations of the elementary organs. 

 70. Conspectus of the Oegans of Plajstts. 



(cells, or primary elementary organs ; vascular 

 Solitary \ ducts, wood-cells, and other modified element- 



( ary organs. 



. ^, . . . ( cellular tissue : bast- 

 'ofthJ lant" i l"indles (with various 



Simple, or 



elementary 



organs. 



Grouped -< 



interstices). 



les 

 spines, glands, 



f pores, tubercles, hairs, 

 bristles, 



Compound 

 organs. 



on the epidermis 



(warts. 



'the root (primary and secondary roots, 

 sorts) ; the stem with its branches (varie- 

 ties of the stem, woody stem, herbaceous 

 stem, cuJm, underground stems). 



Heaves as foliage; 

 the leaves ■< leaves as something else than 



(foliage. 



floral organs {Pjl'^ena ^„a pistils. 



- .. (pericarp; sorts of fruits; seeds; 

 \ seed-coats and kernel. 



A. ELEMENTAEY OEGANS. 

 71. The Cfe?Z (see §21) is the elementary organism, 

 which in numbers constitutes the mass of all vegetation. 



Organs 

 of 

 Vegetal 'o i" 



Organs 

 of re- 

 production 



Cut v. 

 A tnagniflcd cell ; o, membrane ; J, protoplasm within c, the primorcUal ntriclc ; A 

 nucleas. 



