242 MR. I. H. BURKILL ON SOME VARIATIONS IN 
Prunus Panus, Linn. 
In this plant the number of stamens varied from 26 to 34. The 
lower flowers of the inflorescence are the first to mature, and 
usually carry the supernumerary stamens. Thus in 199 flowers 
on eight inflorescences, the lowermost 103 flowers had the 
average of 30°62 stamens to a flower, while the upper 96 flowers 
had the average of 30°46—7. e. 16 more stamens per 100 flowers 
in the lower than in the upper part of the inflorescence. 
Prunus Lavro-Cerasus, Linn. 
Tn this case the flowers of the inflorescence mature from above 
downwards, being just the reverse of Prunus Padus; and so the 
upper, older flowers possess the most stamens. 
54 lower flowers carried 991 stamens—average 18°35. 
54 upper , » 1064 , » 1970. 
Cratmevs Oxyacantua, Linn. 
In this plant we have a cyme, and here the terminal flower 
usually carried the most stamens, the others following in ascending 
order. Two examinations of Hawthorn-flowers were made, one 
having large (A), the other small flowers (B); both were from 
the neighbourhood of Cambridge. 
TABLE XX. 
Number of Stamens in the Flower of Crategus Oxyacantha 
according to Position on Azis. 
A. B. 
No.of | Average. No.of | Average. 
stamens. stamens. 
Terminal flowers ............ 836 18:5 208 149 
Ist lateral p ee. 239 184 111 13:9 
2nd ,, "RR 334 18:4 111 159 
3rd, "M 365 18-2 185 143 
Ath ,, 5 eee 270 180 166 13:8 
5th p "ER 124 177 95 136 
| Branches of higher order... 92 18:5 70 17:5 
