610 ARBORETUM AND FRUTICETUM. PART III. 
¥ R. P. 4 crispa Dec. Prod., ii. p. 261.— Prickles wanting. Leaflets all, 
or for the most part, undulately curled. 
* R. P. 5 umbraculifera Dec. Prod., ii. p. 261., Cat. Hort. Monsp., 157. ; 
R. inérmis Dum. Cours., vi. p. 140. — Prickles wanting. Branches 
much crowded, and smooth. Head orbicular. Leaflets ovate. This 
variety is said to have been raised from the seed of R, Psetid-Acacia ; 
and, according to Dumont de Courset, to have yellow flowers. It 
has been common in British gardens since 1820, but has not yet 
flowered in this country. 
* R. P.6 tortudsa Dec. Prod., ii. p. 261.; and the plate in Vol. IT.— 
Branches much crowded, and twisted. Racemes similar to those of 
R. Psetid-Acacia, but smaller and fewer-flowered. 
¥ R. P. 7 sophorefolia Lodd. Cat., 1830, has the leaves large, and some- 
what like those of Sophora japonica. 
¥ R.P.8 amorphefolia Lk. has leaves somewhat like those of Amérpha 
fruticosa. 
* R. P.9 stricta Lk. has the general tendency of the shoots upright ; 
but still the plant is not so fastigiate as the Lombardy poplar. 
* R. P. 10 procera Lodd, Cat., 1830.— A tall vigorous-growing variety. 
¥ R. P.11 péndula Ort. Dec., p. 26.— The shoots are somewhat droop- 
ing, but not very decidedly so. 
¥ R. P. 12 monstrosa Lodd. Cat., 1830.—The leaves are large, and twisted. 
¥ R. P. 13 macrophilla Lodd. Cat., 1830, has the leaves long, and the 
leaflets broad. 
* R. P. 14 microphilla Lodd, Cat., 1830; R. angustifolia Hort. ; has the 
leaves small, and the leaflets narrow. 
¥ R. P. 15 spectébilis Dum. has large leaves and is without prickles: it 
produces straight vigorous shoots, which are angular when young. 
It was raised from seed by M. Descemet, at St. Denis, and was 
formerly known in the French nurseries by the name of agacante 
(enticing). 
* R. P. 16 latisiliqua, the broad-podded locust, is mentioned in Prince’s 
Catalogue for 1829. 
In America, there are three popular varieties, distinguished by the colour 
of the heart-wood; viz. the red locust, when the heart-wood is red, and 
which is esteemed by far the most durable and beautiful timber; the green 
locust, which is the most common, which has a greenish yellow heart, and 
is held next in esteem to the red; and the white locust, which has a 
white heart, and is considered the least valuable of all; and, in the western 
states, there is said to be another variety, called the black locust. All 
these may more properly be considered as variations, apparently depending 
solely on the soil and situation, in the same manner as the blue colour of 
the flowers of the hydrangea depends on the soil in which it is planted. 
Most of these varieties are tolerably distinct in the foliage when the plants 
are young; but those best worth cultivating, except where there is a com- 
plete collection, are R. P. umbraculifera, the parasol acacia; R. P. péndula, 
the weeping variety ; R. P. stricta, the upright-growing sort; and R. P. 
spectabilis, the vigorous-growing thornless variety. With regard to the 
yellow-flowered variety, it may be worth continuing by grafting or suckers ; 
but, to make quite sure of having white flowers, the trees producing them 
ought to be propagated by grafting also; as plants raised from seed, though, 
for the most part, they have white flowers, yet occasionally produce yel- 
lowish ones. 
Description. The Robinia Psetd- Acacia, though it attains the height of 70 ft. 
or 80 ft., with a trunk of 2 ft. or 3 ft. in diameter, in favourable situations in its 
native country, yet is seldom, if ever, found there with a straight clean trunk, 
which will admit of being sawn up into boards of even moderate dimensions. 
It is a much branched tree, with the branches, as well as the trunk, somewhat 
twisted; the branches have a general tendency upwards when the tree is 
