EUCALYPTUS TREES. 513 
Lindley, S. utile, Klotzsch, S. verrucosum, Schlech- 
tendal, S. Bulbocastanum, Dunal, 8. stoloniferum, 
Schlechtendal, all from Mexico, and some from ele- 
vations 10,000 feet high ; S. Maglia, Molina, from 
Chile, and 8. immite, Dunal, from Peru. 
Sophora tetraptera, Aiton. Var. Macnabiana, Gra- 
ham.—The Pelu of Chile and Patagonia. A small 
tree with exeedingly hard and durable wood, much 
used for cog- wheels and similar structures. The 
wood differs much from that of S. toramiro, of the 
Easter Island (Dr. Philippi). 
Spartina cynosuroides, Willdenow. — Eastern part 
of North America. A perennial grass of fresh water 
swamps, there often called prairie- grass; it can be 
utilized for fodder, and its value as paper material 
seems equal to that of Esparto. 
Spinifex hirsutus, La Billardiére.— On the whole 
coast of extra-tropical Australia. Highly valuable 
for binding coast-sand with its long, creeping roots. 
Spinifex longifolius, R. Brown. — On the tropical 
and western extra-tropical coast of Australia. Avail- 
able like the former. 
Spinifex squarrosus, Linné. —India. Useful like 
the two preceding plants. Tennent remarks that the 
radiating heads become detached when the seed is 
matured, and are carried by the wind along the sand, 
over the surface of which they are impelled by their 
elastic spines, dropping their seeds as they roll along. 
The heads are so buoyant as to float lightly on water, 
and while the uppermost spiny rays are acting as sails, 
they are carried across narrow estuaries to continue 
the process of embanking beyond on any newly-form- 
ed sand-bars. 
