267 
apes Flores masculi copiose paniculati, distincte pedi- 
ellati; rhachides ramulisque eee es? minute scrobiculatae. 
Cala ‘apice pubescens, in alabastro globosus, clausus, dein apertus 
3mm. latus. Stamina 20-25, filamenta gracilia antheris vix longiora ; 
ttiersrain connectivi Gin glandulis 3, raro 1, cereis fens 
deciduis instructi. lores feminet in racemos copiose ramosos 
dispositi, parvi, 4 mm. Loge, 6 mm. lati. peti linearilanceolta 
pubescentia, basi in tubu um. —— con 
; Tukurua, 1280 m., Laban, 5567 ; Babadju, 1580 m., 
ad daaa 5987. 
XXXV.—_GRAFT HYBRIDS* 
(With Plates.) 
W. J. BEAN. 
Although it is now between eighty and ninety years since 
Laburnum Adami, the first graft hybrid, appeared, the remarkable 
diversity of blossom borne on the one tree remains a perpetual 
source of interest and wonder. It is curious that its history is not 
by now better known. During the past Laburnum season, twelve 
daily press on the same subject. It may, therefore, be worth while 
to recount the origin and history of Laburnum Adami, which, 
briefly, is as follows :— 
n 1825, a nurseryman of Vitry, near Paris, named Jean Louis 
Axis, orafted t the dwarf purple broom, Cytisus purpureus, on the 
common Laburnum. At the union of the scion with the stock 
there subsequently appeared a shoot which bore flowers of a purplish 
yellow, and, to all seeming, intermediate between those of the purple 
broom and the Laburnum. This was propagated and called aes 
its one and is the Laburnum Adami as we 
fe 
purpureus. Th e tree has retained this remarkable peadnetars 
until the present time. The branches that bear the flowers of true 
Laburnum and Cytisus purpureus are in every way ¢ characteristic of 
their respective species, which they reproduce quite true from seed 
* See E. Jouin in Le Jardin, 1899, p. 22 (“Le Néflier de Bronvaux ’ pn 
Det. Campbell in The Ameri ican Naturalist, vol, xlv., p. 41 (“ The Natit of 
Graft Hybrids”). 
20357 B2 
