346 GENETICS IN RELATION TO AGRICULTURE 
Fig. 143.—Details of wheat inflorescence. 
The smaller spike is Fife and at its left is shown a Blue Stem spike. In the lower right- 
hand corner is a spike from which small late flowers have been removed preparatory to 
crossing. 
At 2, spikelet, natural size, with a few joints of the rachis; f and g are flowerless glumes; k, 
florets bearing seeds; 7, rudimentary florets. 
3, a single flower closed just after flowering, X3. 
4A, longitudinal diagram before flowering, 2.5; anthers marked a; ovary, 0; stigma, 
s; filament, f. 
4B, diagram of floret just after flowering, 3, showing how anthers are held within the 
envelope. : 
5, transverse diagrammatic section, or floral plan, as is made by cutting across 4A at z, 
<6; fg, flowering glume or lemma; p, palea; a, anthers; s, stigma. 
6, flowerless glume; 7, flowering glume or lemma; 8, palea; all slightly reduced. 
9, lodicule, <4, shown also at L in 4B. 
10, cross-section of anther, X26; showing the pollen sacs and the central mass of tissue 
to which they are attached. 
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