30 



PRACTICAL BOTANY. 



III. 



ORGANOGRAPHY. 



60. Plants (organized bodies) consist of organs, 

 Tliese organs are distinguished into — 1. Simple^ or ele- 

 mentary organs^ which are the most important of all, 

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

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

 microscope. 2. Cojnjpound^ or external organs^ which are 

 formed of combinations of the elementary organs. 

 70, Conspectus of the Organs of Plants. 



r cells, or primary elementary organs ; vascular 

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

 ( ary organs. 



Simple, or i in the interior ( *^®^^^^*^^ tissue; bast- 



elementary^ Grouped ■} r*i,„^i„..* ■! bundles (with various 



organs. I ^ ( ''^^^^^P^*'"*' ( interstices). 



{ pores, tubercles, hairs, 

 on the epidermis \ bristles, spines, glands, 



( warts. 

 rthe root (primary and secondary roots, 

 j sorts) ; the stem with its branches (varie- 

 I ties of the stem, woody stem, herbaceous 

 ' stem, cuJm, underground stems). 

 ^ leaves as foliage ; 

 the leaves \ leaves as something else than 

 ( foliage. 



Compound J 

 organs. 



Organs 



of 



Vegetal o 



Organs 

 of re- 

 production 1 



I fi°^^^ «^g^^« Isram^ns ind pistils. 



fruit 



j pericarp; sorts of fruits; seeds; 

 1 seed-coats and kernel. 



A. ELEMEKTAKY OKGANS. 

 71. The Cell {^QQ §21) is the elementary organism, 

 which in numbers constitutes the mass of all vegetation. 



Cut v. 

 A magnified cell ; a, membrane ; 6, protoplasm within c, the primordial utricle ; d 

 nucleus. 



