212 
a plant with the Thompsonii type of variegation. The variega- 
tion spread into the new leaves of the green plant and the whole 
in time became fully variegated. 
Abutilon Souvenir de Bonn is quite similar to A. Saviizti, but 
the white margin is more regular, is narrower and seldom invades 
the center of the leaf. The leaves are five-lobed, but the lobes 
are narrower and the leaf more indented. (Compare fig. 9 with 
fig. 5.) First reference to this form appeared in 1893 (Taplin, 
1893), but its exact origin is not known. A plant of this type 
at the New York Botanical Garden gave an all green branch, 
a leaf of which is shown in fig. 8. 
The purely green branches, it y be presumed, -produce 
leaves which resemble closely the oe types from which A. 
Saviizit and A. Souvenir de Bonn originated. The quite marked 
differences in the two (figs. 7 and 8) indicate that they are not 
ma common parent, and that one is not derived from the 
other, and suggests that the type of bud variation which results 
in a ee chimera has occurred spontaneously in these 
two Ci 
eee Abutilons can be grouped into two classes; 
those with a mottled variegation that is infectious and those with 
a non-infectious variegation with the white cells at the periphery. 
Both types are of importance in horticulture, especially for use 
as bedding plants; both types are of special scientific interest. 
A. striatum Thompsonit is in a way a plant of historical interest, 
for upon it has centered much study regarding the nature of 
infectious variegation. 
KATHERINE W. REID. 
IBLIOGRAPHY 
Baur, E. (1904.) Zur Aetiologie der infektiose Panaschierung. Ber. Deut. Bot. 
es. 22: 453-460 
906.) Uber ‘die infektiose Chlorose der Malvaceen. Sitz. Kon. Preus. 
ic Wie I: II-29. 
(1906.) Weitere mitteilungen iiber die infektidse Chlorose der Malvaceen 
und Ee einige analoge Erscheinungen bei Ligustrum, Laburnum, Fraxinus. 
Ber. Dew ot. Ges. 24: 416-4 
tir “Das Wesen und dle Er sa ata eis der ‘varietates 
albomarginatae hort." von Pelargonium zonale. Zeits. f. ind. Abst. u. Verer- 
bungslehre 1: 330-351 
