38 ESTABLISHMENT OF VARIETIES IN COLEUS 



In diagram 3 the numbers (except 13 a) refer to figures illustrating 

 the types of color pattern or leaf-shape. The name of the pattern is 

 written in full only in the line of descent when it first appeared. A 

 continuous line indicates origin by bud variation, while a broken line 

 indicates fluctuation. 



From the original pattern of green-yellow-red blotched there arose 

 directly 6 different patterns (see tables 1 and 2 and diagram 3) each 

 involving a single marked variation. For the development of any 

 other pattern thus far produced, excepting the green-yellow-solid red 

 upper center pattern a second change is necessary. On any of these 6 

 derived patterns a further single change may give a new pattern or 

 produce a pattern already realized. The bud variations in the derived 

 pattern green-yellow spotted-red blotched (fig. 4) illustrate this point. 

 Increase of yellow gave yellow-red blotched (fig. 1) and loss of yellow 

 gave green-red blotched (fig. 5), both patterns previously derived, and 

 also a return to the original type of green-yellow-red blotched (fig. 2). 

 In all these the red-blotched condition of the epidermis is much the 

 same. Changes in the epidermal coloration, however, give new pat- 

 terns. The appearance of solid red gives a slightly different pattern 

 than that of green-yellow-solid red. The pattern green-yellow spotted 

 appeared as a bud variation by a loss of the epidermal red. 



The green-red blotched (fig. 5) pattern gave opportunity for new 

 patterns by the same changes in epidermal red which have previously 

 appeared. These are realized in green-solid red (fig. 9) and green-no red 

 (fig. 13) . There is also chance for reappearance of yellow to give return 

 to old types or possibly to new types. Of these only one appeared, and 

 this was the pattern green-yellow spotted-red blotched (fig. 4) . The cases 

 of spontaneous appearance of yellow did not result in a definite pattern. 

 In this line of descent there also developed the character of laciniate 

 shape of the leaf, with its marked periodicity of expression. 



The changes in the pattern yellow-green-red blotched (fig. 6) which 

 involved amounts of green and yellow gave no new patterns. The 

 loss of red, however, gave a new pattern yellow-green (fig. 14). At 

 least 3 possible bud sports did not appear in this pattern: (1) changes 

 producing a reversal of green and yellow giving return to the parent 

 type; (2) a solid-red (fig. 11); or (3) solid red upper center (fig. 10). 



In the plants with green-yellow-solid red (fig. 8), a loss of yellow gave 

 the same pattern that was produced by gain of solid red from pattern 

 green-red blotched. The two changes involved are identical, but occurred 

 in reversed order. Reversal of the positions of green and yellow, a 

 change identical with that giving the yellow-green-red blotched pattern, 

 gave a different pattern because the tissues were overlaid by solid red. 

 The same is true of the loss of green. Loss of the epidermal red on the 

 lower surface and about the margin of the upper surface gave a pattern 

 green-yellow-solid red upper center (fig. 10) that has not appeared else- 

 where and is really the only new variation that appeared in this pattern. 



