CONVOLVULACEiE. 
249 
necessary, and the pots must be large in proportion to the size of 
the tubers ; indeed, the more root-room that is allowed, in general, 
the finer will be the growth and production of blossoms. The 
habit of the majority of the species fits them either for large 
trellisses or the roof of the stove ; the beautiful HorsfalluE is 
extremely effective in the latter position, but requires a good deal 
of attention to the removal of insects, which soon congregate 
upon it, and thence descend to the plants beneath. As a difficulty 
is always experienced in propagating this and several other 
species by cuttings, we may mention, that the readiest mode is 
by root-grafting. If a piece of a growing shoot (the end of a 
young one is best) is taken, and attached to a separated root of 
proportionate thickness, by means of a cleft cut in the latter, 
and the base of the cutting reduced to a wedge-form, securely 
fastened with bass, and plunged in a brisk bottom heat, with the 
extra assistance of a glass over all, it will soon unite and grow 
rapidly, thus making a blooming plant in the same season; 
while the cuttings, treated in the ordinary way, will remain on 
hand many months. Any that root tardily as mere cuttings, may 
be thus increased with the greatest facility. 
The greenhouse species are, candicans , white; pandurata , 
white and red; Michauxii , white and blush ; Carolina , purple ; 
pendula , purple ; dasyspermia , yellowish-purple ; sinuata, white ; 
and longifolia , white. Pendula has a suffruticose habit, and the 
others are all climbers, differing from the former section only in 
requiring a lower temperature. Of the hardy species, I. atro- 
purpurea is most familiar. The other kinds enumerated in this 
section need only the same easy treatment, of being sown where 
they are to flower, and are almost equally worthy of attention. 
In growing these plants, it should be remembered that they de¬ 
light in rich soil. No other consideration need be mentioned. 
Leptocallis is a small genus of only one species, L. armata , a 
stove, climbing annual, with red flowers, tinted with rich shades 
of violet. It should be sown in March, and have the assistance 
of bottom heat in its earlier stages. 
Mina is another equally small genus. The only known species 
is M. lobata , a greenhouse plant of scan dent habit, with beautiful 
pale lilac and crimson flowers. It should be grown in peat and 
loam, with plenty of air and water in summer. When trained 
