Xliv PROCEEDINGS OF THE ROYAL HORTICULTURAL SOCIETY. 



few of the points which showed the proportional intermediate 

 characters. Taking, e.g., P. cceruleum ; the hybrid : P. reptans ; 

 the length of blades of similar leaves were as 3 : 4'5 : 5. The 

 apex of a leaflet — shortly acute ; sub acuminate ; acuminate. 

 Anther elongated, golden yellow ; shorter, pale yellow ; shortest, 

 white. Size of pollen-grains — 2 : 1*75 : 1*5, &c. With regard 

 to P. flavum xP. cceruleum, Mr. Dod writes : " This is the most 

 interesting of the many hybrids of Polemonium which come up 

 in my garden. I have no doubt of the hybrid, because I have 

 carefully saved seed of P. flavum, and the hybrid has shown 

 itself among several sowings. It is interesting because in colour 

 and flower it so nearly follows the pollen parent. The difference 

 in habit is considerable. P. c. has a perpendicular habit of 

 growth, but the hybrid follows P. flavum in being divaricate at 

 the base, the hybrid is absolutely barren, though the parents are 

 both profuse seeders. The hybrid, however, is most prolific in 

 other ways ; for any stump or stalk grows readily and luxuri- 

 antly." With regard to other characters, the hybrid is more 

 decidedly pubescent than in the stem, &c, of P. c. ; but less so 

 than P. fl. The petals of P. c. have a round purple ring at the 

 base of the corolla. In the hybrid this is wanting, as it is also 

 in P. fl., &c. The cross between Heuchera cylindrica, with 

 green flowers, and H. sanguinea with crimson flowers, is very 

 obvious, the hybrid having rose-red flowers. The pollen, unlike 

 that of the parents, was very bad. Though the leaves resembled 

 those of the parents in size, the veining agreed mostly with that 

 of H. sanguinea, the angles between the palmate veins being less 

 acute than is the case in H. c. In the form of the calyx, the 

 hybrid also approximated that of H. s. rather than that of 

 H. c. In Papaver orientale var. bracteatum x P. rupifragum, 

 this hybrid, though decidedly intermediate, approaches P. rupi- 

 fragum the nearest. Thus while P. or. is hirsute, P. r. is 

 pubescent. In the cross the hairiness is of an intermediate 

 character. This is well seen in the calyx by the following pro- 

 portions :— P. or. : Hyb. : P. rupifragum ; stiff curved hairs : 

 soft curved hairs : tomentose. The peduncle has cords scattered, 

 as in endogens, in P. orientale ; while in the hybrid and in P. 

 rupifragum the peduncle is much smaller, having the cords in a 

 ring. The corolla is scarlet in P. orientale ; orange in hybrid 

 and P. rupifragum, &c. Generally speaking, therefore, the 



