268 ALPINE FLOWERS AND ROCK GARDENS. 



Society at Wisley, Surrey. The petals are borne in 

 threes, hence the name Trillium. This lovely plant 

 can be procured from bulb-dealers in autumn at a 

 moderate price. It may be propagated by division. 

 There is a form called roseum. The only other species 

 much grown is eredum, which has purple flowers. 



TROLLIUS (Globe Flower). — ^This genus gives 

 us several species which are quite worthy of culture in 

 any garden, coming into bloom early in the year, and 

 producing large brilliant yellow flowers. They are a 

 little too robust in growth for small rockeries, but may 

 be used for larger ones in damp places. I find them 

 good on rather poor chalky soil, but they reach their 

 best in loam or peat. They are best propagated by 

 division at the end of summer. The two most popular 

 species are asiaticus and europceus^ the former with 

 orange, the latter with pale yellow flowers. There 

 are several varieties of each. 



TULIP. — Although one of the most important 

 of bulbous flowers the TuHp is not of special value for 

 the rock garden. The early Dutch varieties are not 

 really worth special sites, as they do perfectly well 

 in beds and borders ; and the late sorts known as 

 " Cottage " and " Darwin *' Tulips are too large. 

 Some of the smaller and more interesting species may, 

 however, be grown on the rockery. The bulbs can be 

 bought in autumn, and planted in sandy loam for 

 preference, but they are not fastidious about soil. 

 When the foliage has decayed it may be removed, and 

 if propagation is required the offsets may be removed 

 and planted afresh. The following are dwarf and 



