GARDEN FLOWERS. 355 



T. biflorus (two-flowered) ; hardy annual ; 6 inches ; flowers 

 yellow, in July ; Barbary ; 1818. T. piirpiireus {^nx^\€) ; hardy 

 annual ; i foot ; flowers dark-purple, in July ; Sicily ; 1769. 



Thalictrum. Meadow-rue. [Ranunculaceae.] Hardy 

 herbaceous perennials, worth growing in a mixed border for 

 the sake of their pretty compound foliage, but having rather 

 insignificant blossoms. They grow freely in common gar- 

 den soil, and are increased by division of the plant. 



T. aquilegifoliu7tt (columbine-leaved) ; hardy perennial ; 3 

 feet ; flowers purple, in May ; .Austria ; 1731. 



T. corynelluDt and dioicum are natives of our woods and 

 meadows. T. anetnonoides^ or A7ie'mone thalktroides, is a beau- 

 tiful little spring-flowering plant : the double variety is very 

 desirable. There are over sixty species. 



Thrift. See Armeria. 



Throatwort. See Trachelium. 



Thorn-Apple. See Datura. 



Thuja. Arbor-vitce. [Coniferae.] These are among the 

 best of evergreen shrubs for the shrubber}', or as specimen 

 plants on lawns. T. oriejitalis, the Chinese Arbor-vitae, is 

 well known, and is admired for its close cone-shaped out- 

 line. T. occidefita/is, the American Arbor-vitas, has the same 

 habit, but is of looser growth. There is another elegant 

 hardy species called 71 pHcata, not uncommon in gardens ; 

 and one much rarer, T. pendula, which has long slender 

 drooping twigs, and is a most singular and very ornamental 

 small tree. The commoner sorts grow well in any moder- 

 ately favorable situation, preferring a somewhat moist but 

 not marshy situation. They are best raised from seeds, 

 sown in April, in a frame or covered bed. T. pendiila 

 should be kept dryer, and is increased by grafts or cuttings. 



T. occidentalis (y7 est&rn) \ hardy evergreen shrub; 15 feet; 

 flowers green, in May; North America; 1596. T. orientalis 



