THE ORNAMENTAL PLANTS —BULBS 281 
June; flowers, small, white to purplish, very numerous and borne 
in large panicles. 
Trollius Huropwus.— Height, 14 to 2 feet; fourth week of May ; 
flowers, large, bright yellow, continuing a long time. 
4. Buuss anp TuBERS 
(See the particular culture of the different kinds in Chapter 
VIII; and instructions for forcing on p. 845.) 
It is customary to write of bulbs and tubers together, be- 
cause the tops and flowers of all the bulbous and tuberous 
plants spring from large reservoirs of stored food, giving rise to 
similar methods of culture and of storage. 
Structurally, the bulb is very different from the tuber, how- 
ever. A bulb is practically a large dormant bud, the scales 
representing the leaves, and the embryo stem lying in the center. 
Bulbs are condensed plants in storage. The tuber, on the other 
hand, is a solid body, with buds arising from it. Some tubers 
represent thickened stems, as the Irish potato, and some thick- 
ened roots, as probably the sweet-potato, and some both stem: 
and root, as the turnip, parsnip, and beet. Some tubers are very 
bulb-like in appearance, as the corms of crocus and gladiolus. 
Using the word “bulb” in the gardener’s sense to include 
all these plants as a cultural group, we may throw them into 
two classes: the hardy kinds, to be planted in fall; and the 
tender kinds, to be planted in spring. 
Fall-planted bulbs. 
The fall-planted bulbs are of two groups: the “Holland 
bulbs” or early spring bloomers, as crocus, tulip (Fig. 255), 
hyacinth (Fig. 262), narcissus (Fig. 260), squill (Fig. 256), 
snowdrop; the summer bloomers, as lilies (Figs. 258, 259). 
The treatments of the two groups are so similar that they may 
be discussed together. 
