148 



BROOKLYN BOTANIC GARDEN MEMOIRS 



Our study was made on a population of 53 plants. Pedigree 

 numbers from o to 39 inclusive represent the cross N. alata X A''. Jor- 

 getiana; pedigree numbers 40 to 52 inclusive represent cross N. for- 

 getiana X N. alata. 



Each plant was selfed one or more times, and all proved abso- 

 lutely self-sterile. Further each plant was hack-crossed with pollen 

 from a single plant of each of the parent species with complete success 

 in every case. The plants used in this case were not the individuals 

 that entered into the cross, however, for unfortunately these were 

 not available. 



TABLE I 

 Result of Matings on Fi Plants o to 39 



N. alata X N. forgetiana and on Plants 41 to 52 N. forgetiana X N. alata 

 Ped. No. Fertile with Fed. No. Sterile withPed. No. 



o 44, 46 22, 34, 38, 49 



I 2, 3, 4, 6, 41 8 



2 4, 18, 41, 44, 52 9, 22, 23 



3 2, 9, 14, 23, 29 4, 6, 18, 41, 46 



4 2, 9, ID, 44 18 



5 2, 3, 6, 9, 10, 18, 46 8, 44 



6 5, 10, 43, 44 3, 4, 18, 40 



7 2, 13, 22, 44 18, 46 



8 6, 9, ID, 39, 40, 46 5, 44 



9 3- 18, 44, 52 2, ID, 23, 37, 48 



10 4, 6, 18, 40, 44 2, 23, 24, 27, 34, 48 



II 2, 8, 12, 15, 34, 44, 46 



12 9, 16, 22, 43 6, 18, 46, 52 



13 3, 8, 18, 44, 46 2, 9, 15, 21, 34 



14 18, 20, 43 10, 34 



15 I, 3, 16, 17, 18, 20 9, 13, 14, 23, 44 



16 13, 14, 18, 25, 43, 46 17, 29 



17 14, 18, 19, 20, 22, 30 16, 26, 44 



18 2, 9, 21, 23, 28, 34, 36, 44 3, 46 



19 17, 22, 28, 34, 44 18 



20 2, 8, 9, 16, 18, 21, 22, 26, 36, 40, 44 43 



21 4, 12, 16, 18, 46 2, 9, 22, 25, 27, 37 



22 12, 42, 44 14, 23, 24, 36, 48 



23 41 9, 10, 37, 48 



24 3, 6, 20, 26, 28, 44 10, 22, 23, 30, 37 



25 8, 33- 44. 46 2, 9. 23, 27 



26 9, 18, 22, 23, 25, 40, 48 28, 29, 44 



27 3, 18, 32, 44, 46 2, 9, 30, 34, 48 



28 2, 3, 23, 27, 39, 46 8, 26, 29, 44 



29 2, 14, 18, 22, 23, 24, 25, 30, 34, 37, 41, 46 5, 26, 28, 31, 44 



30 8, 29, 33, 44, 45, 46 9, 21, 22, 27 



31 22, 32, 52 8, 29, 36, 44 



32 9. 21, 23, 29, 30, 34, 43, 44 18, 33, 46 



33 8, 16, 23, 31, 46 18, 32 



34 28, 41, 44, 46 10, 23, 24, 37 



35 3. 9, 18, 21, 27, 30, 34, 37, 42 8 



36 8, 33, 44, 46 ID, 23 



37 39, 42, 43, 44. 46 9, 10, 22, 23, 34, 38 



