THE WHEAT PLANT. 



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a--T 



Pifi. 1.).— rho spikes, flowers, and seed of wheat. 1, spike of Fife at the right, and a hhie stem 

 spike at the left. ,', spikelet (natural size), with a lew joints of the rachis: /and (/ are Howor- 

 ft^ glumes; k, florets bearing seeds; r, rudimentary florets. ;1, a single flower closed, just 

 alter flowering ( xfj). f,A, longitudinal diagram before flowering; anthers marked a: ovary, o; 

 stigma, .s; filament,/. 4jB, diagram of floret just after flowering, showing how anthers'are 

 hold within envelope, lettered as in /,.! ( ■ 5). r,, transver.se diagrammatic section or floral 

 plan, as is made by cutting across /,. I atX; /</, flowering glume; }>. palea: <i. anthers; .s-, stigma. 

 '-, flowerless glume ( natural size i. 7, flowering glume i natural size i. n, palea ( natural .size ). 

 .'', lodiculo (■•!); shown also at / in /,li. in, <-ro.ss section of antlier, showing the pollen s.ics and 

 the central ma.ss of tissue ti> which they are attached ( :i(l). //. pollen grams, round and 

 smooth, .5.) micro-millimeters in diameter. l.\ ovary and stigma just jjrior to flowering. J.;, at 

 the time of flowering. ;/,, shortly after flowering. ;.■;. /^.and /;. tlie mature seed; n. the ven- 

 tral .side; /-, the dorsal side; r, the germ, or eliit; .s, the .stem end of the germ; r, the root end 

 * 1 -f*"^"'" ' ' ou*^®'" liiyers of the grain, or bran; <l, the incurved surface of bran on the ven- 

 tral side of the seed. The white portions of /'.and 77 are the floury interior, consisting of cells 

 containing the ghiten and starch from which white Hour is made, is, portion of the stigma, 

 showing an attached pollen grain which is germinating and seixling its tube down to the ovule. 

 19, spike from which small lato flowers have been removoil preparatory to crossing. 



