422 THE NURSERY-MANUAL 



Soybean (Glycine Soja). Leguminosce. 



Grown from seeds sown where the plants are to stand; frost- 

 tender. Two to three pecks of seed are required for an acre in drills, 

 and a bushel or more broadcast. 



Sparaxis. Iridacece. 



Propagation is usually by offsets ; also by seeds. 

 Sparmannia. Tiliacece. 



Handled by cuttings of half -ripened wood, as tips of young 

 shoots, in spring. 



Spartium. Leguminosce. 



Propagated by seeds and by greenwood cuttings under glass. 

 Spathiphyllum. Aracece. 



Propagated mostly by division of the rootstocks ; also by seeds 

 when procurable. See Araccce, page 239. 



Specularia (Venus' Looking-Glass). Campanulacece. 



The common annual specularias are easily grown from seeds 

 sown where the plants are to bloom, or they may be started indoors. 



Sphaeralcea (Globe Mallow). Malvaccce. 



Propagated by seeds ; by greenwood cuttings. 

 Sphaerogyne : Tococa. 

 Spinach (Spinacia olcracea). Chenopodiacece. 



Raised from seeds, sown usually where the crop is to stand, either 

 in fall or spring. Sometimes started in hotbeds for early crop, 

 and transplanted to field or allowed to mature in the frame. The 

 plant is hardy, and in the intermediate climates will stand in field 

 over winter if six to nine weeks old when freezing weather sets in. 



Spiraea. Rosaceoe. 



Propagated by seeds, sown as soon as ripe or stratified till spring. 

 Commonly increased by cuttings, either of mature or green wood. 

 Green cuttings usually make the best plants. These are made in 

 summer and handled in frames. Some sorts are grown from layers in 

 spring. The herbaceous kinds are often increased by division, but 

 these kinds are now referred to other genera, as Filipendula and 

 Aruncus. Plants forced in winter give excellent cutting-wood, which 

 should be taken when the growth is completed. Genera formerly 

 included in Spiraea are Chamsebatiaria, Holodiscus, Physocarpus, 

 Sibirsea, Sorbaria, and others. 



