BO TA NIC A L TERMS. 



3') 



Ray-Florets (always without stamens). 

 Number : 5, 10, 20, oc , etc. 

 KiXD : 



(a) Pistillate^ if the pistil is present. 



(b) Neutral, if the pistil is absent. 

 Shape : linear, oblong, ovate, etc. 

 Colour : white, yellow, etc. 



Pappus (if present) : 



(a) Simple, if in a single row of similar pieces. 



(b) Double, if there is an outer row of shorter pieces. 



(c) Capillary, of fine hair-like pieces. 



(d) Plumose, of branching hairs or bristles, as in 

 Thistle. 



(e) Barbed, if the hairs have teeth pointing backward, 

 as in Dandelion. 



(f) Chaffy, of a few teeth or scales (Fig. 231). 

 ACHENE : 



(a) Com,pressed, when somewhat flattened. 



(b) Terete, cylindrical (the cross-section round). 



(c) Angled, as in Fig. 232. 



(d) Striate, marked with fine vertical lines, 



Disk-Florets. 



XuMBER : 5, 10, 20, cc, etc. 

 Kind : perfect, staminate, etc. 

 Colour : j^ellow, brown, etc. 

 Pappus : as for the raj' -florets. 

 AcHEXE : as for the ray -florets. 



Receptacle. 



FoRJi : flat, concave, convex, conical, etc. 

 Surface : 



(a) Chaffy, if there are chaff-like scales or bristles 

 growing on the receptacle among the florets (Fig. 230), 

 as in Sunflower. 



(b) Smooth, or naked, if there are no such scales or 

 bristles, as in Dandelion. 



Involucre. 



Form : 



(a) Ovoid, egg-shaped, the broader part below, as in 

 Thistle. 



(b) Cylindrical, nearly the same width all the waj' up 

 (Fig. 233). 



(c) Saucer-shaped, very flat and shallow. 



(d) Cup-shaped, Bell-shaped, etc. 



£?=V^ 



Fis. 231. 



Fig. 232. 



Fig. 233. 



