Survey of Plant Kingdom 145 



Cuticle 



Upper epidermic 



Palisade tissue 



iponqry tissue 

 Stoma 



Lower epidcrmii 

 Quard QcWs 



Mechan\ca\ tSssue 

 .Parenchyma 

 ^MeduHary ray 



Stigma ^ 



Jtyle- 



%- -Ovulary 

 Root hair 



<:<-'« (EnSSTif. 



,Vasca]ar bundle 



Vascular (\ 1 PWocm 



bundle \\ Cambium 



IXylcm 



Pitii / 'iDiral' Pitted 

 Jpiral 1 duct ,' -»'■'* 

 duct WoodceJIs 



1 iJuct ,' duct I i.ievetubej 



Cambium cells 



Epidermis /^ 



Fig. 57. — Sunflower (Helianthus sp.). A, Part of plant showing flowers and 

 leaves; B, disk floret in bud; C, disk floret further developed with elongated style 

 and opened stigmas; D, leaf in cross section (somewhat diagrammatic) ; E, stem 

 in cross section; the mechanical tissue and the parenchyma constitute the cortex; 

 F, enlarged vascular bundle (such as shown \n E) , showing cross and longitudinal 

 views; the spiral and pitted ducts are present in the xylem or woody part of the 

 bundle; the sieve tubes and bast cells constitute the phloem of the bundle; the 

 embryonic, thin-walled cambium lies between the xylem and phloem; G, root in 

 diagrammatic cross section in the region of maturation. The ovulary is also 

 known as the ovary. 



