May 8, 1916 



Occurrence of Sterile Spikelets in Wheat 



239 



Table I. — Number and percentage of sterile spikelets on 25 spikes of bearded and smooth 

 varieties of wheat in igi^ — Continued 



Variety. 



Bearded 



or 

 smooth. 



Total number 

 of spikelets. 



Drill. Hill. 



Number of 

 sterile spikelets. 



Drill. Hill 



Percentage of 

 sterile spikelets. 



Drill. Hill. 



u. s 

 u. s 

 u. s 

 u. s 



Tennessee 3617 



Tennessee 3277 



U. S. 2980 



3608 



3609 



3610 



3612 



U. S. 3613 



U.S. 3614 



Abundance 



Auburn Red 



Australian Red 



Banat 



Bulgarian 



California Red 



Davidson 



Deitz Amber 



Deitz Mediterranean . 



Early Pearl 



Early Ripe 



Economy 



Egyptian 



Farmers Friend 



Ghirka Winter 



Goings 



Grand Prize 



Invincible 



Jones Red Wave .... 

 Kentucky Bluestem. 



Lancaster 



Lehigh 



Petigree Giant 



Red May 



Reiti 



Sibleys New Golden . 



Texas Red 



Tread well 



Tuscan Island 



Ulta 



Winter Chief 



Winter King 



Wisconsin 13 



Leaps Prolific 



17. 16 

 18.36 

 14.84 

 17.92 



17. 12 



18. 16 

 17-52 

 15.00 



16. 40 

 16.44 

 16.08 

 14.52 



13-72 

 14.88 

 14.96 



15-95 

 14. 52 

 14.44 

 13.04 

 15.08 

 14.48 



14. 08 



13. 00 

 15-76 



15. 16 

 17.76 

 17.92 

 18. 20 

 14.84 

 14.36 

 13.96 

 18. 24 



14-32 



14. 72 

 14.44 

 13.04 

 15-24 

 15-32 

 13-32 

 15-44 

 14. 16 

 13. 12 



17. 06 



20. 44 



21. 60 

 17.08 

 21. 24 



19. 68 

 21. 56 

 21.36 



20. 40 



19. 20 

 17.76 

 16.88 

 15.84 



15- 52 

 16.68 



15-76 

 17.44 

 15.88 

 15.64 

 13.92 

 16.08 

 15-36 

 17. 20 

 14.40 

 18.56 



14. 80 

 19.72 



20. 60 

 20. 21 

 17.28 



15. 16 



17. 16 

 19.40 

 16.84 



17- 



17.84 



17.28 



18. 00 



16. 72 

 16. 04 

 17- 56 

 15.04 

 16.36 



4.68 



5- 40 

 2. 92 

 4.84 

 4-36 

 3-52 

 4.48 

 3-92 

 3-40 

 2. 60 



3-40 

 3-24 

 3-48 

 4. 16 

 2.88 

 1.84 

 3.80 



3-50 

 2. 56 

 2.80 

 2. 72 



2.36 

 2. 64 

 2. 00 

 2. 72 

 2. 20 

 1.68 

 2.52 

 2. 56 

 1.80 

 2. 00 

 2.32 

 2. 12 

 2. 64 

 2. 04 



•32 



.80 



I. 24 



1.32 



•72 

 .68 



1. 16 

 1.80 

 1.68 



2. 12 



1. 04 



2. 00 

 2.32 

 I. 64 

 I. 40 

 I. 96 

 2.88 

 I. 40 



•36 

 1.68 



1-52 

 I. 76 



1. 72 



2. 00 

 I. 24 



•44 

 1.28 

 I. 24 



.68 



27. 27 

 29.41 

 19.67 



27. 06 

 25.46 

 19.38 



25-57 

 26. 13 

 20.73 

 15.81 



21. 15 

 22.31 

 25-36 



27-95 

 19.25 

 11.52 

 26. 17 

 24.23 

 19.64 

 18.56 

 18.78 

 36.07 



22. 76 

 28.88 

 19.78 

 18.91 



24-33 

 23.29 

 21. 02 

 24.23 

 25. 21 

 20. 83 



18.43 

 25. 14 

 24.65 



29- 14 

 30.18 



25-58 



28. 52 



15-54 

 22.88 

 28.65 

 13-36 



11-54 

 12. 22 



11. 70 



12. 80 

 II. 17 



7-79 

 79 

 54 

 36 

 26 

 74 



13-38 



17. 01 



12.23 



2.03 



4-58 



7.80 



8.43 



5-17 

 4. 22 



7-55 



10. 46 



11. 69 

 11.36 



7. 02 



10. 14 



11. 26 

 8.15 



8. 10 



12. 92 

 16.78 



7. 21 

 2.13 

 9-39 

 8.54 

 16.18 



9-55 

 II. 96 



7-73 

 2. 50 



8.51 

 7-58 

 3.60 



Average . 



15-85 



17-13 



3-47 



73 



10. 09 



Of the 188 varieties and strains of wheat under observation, io8 were 

 beardless and 80 bearded. To determine whether the presence or absence 

 of awns as a morphological character was in any way correlated with the 

 occurrence of sterile spikelets, the varieties were tabulated so as to show 

 the distribution of bearded and of beardless varieties with reference to 

 the percentage of spikelets (see Table II). The data in this case were 

 taken from the varieties sown in drills. 



