312 WOODY PLANTS OF MASSACHUSETTS. 
without notice. The one is the Planer tree, Planera wlmifolia, 
of Michaux, which is found on the banks of the Mississippi, 
and in Kentucky and Tennessee. The other is the Zelkoua 
or Tselkwa, Pianera Richardi, of Michaux, a native of the 
country between the Black and Caspian Seas, from lat. 35° to 
47°, "This was introduced into France in 1782, by the elder 
Michaux, and has since been cultivated both in that country 
and England. Its trunk resembles that of a beech, being kept 
smooth by the exfoliation of the outer bark. It is a lofty, 
richly tufted and picturesque tree, remarkable for its rapid 
srowth, and for its shining green leaves being not liable to the 
attacks of insects. Its wood is of very great value, extremely 
beautiful, heavy, dense and hard, finely-veined and susceptible 
of the highest polish, and surpassing oak in durability, never 
becoming worm-eaten, however old 1t may be. 
There is another tree, belonging to the family of Balsama- 
ceé, for which I have hitherto searched New England in vain, 
which yet is probably found here; asit occurs abundantly in 
parts of New York nearest us. It is the Sweet Gum, Liquid- 
ambar styraciflua, whose star-like leaves are so conspicuously 
beautiful in the woods of New Jersey in autumn. 
FAMILY XI. THE SANDAL WOOD FAMILY. SANTAL‘ACEAE. 
R. Brown. 
This family, which receives its name from the Santalum, one 
species of which produces the well-known odoriferous sandal- 
wood, comprehends trees, shrubs, under-shrubs and herbs. The 
Hower-cup is three- or five-cleft, greenish and leaf-like exter- 
nally, and colored internally. <A fleshy disk which is entire or 
lobed, occupies the bottom of the Hower, and adheres to the base 
of the flower-cup, or to the ovary. The stamens are equal in 
number to the lobes of the flower-cup, or twice as many. The 
ovary is one-celled, with from one to four ovules. The fruit is 
a drupe or nut, one-celled and one-seeded. The leaves are 
alternate, and undivided. In North America, it includes trees, 
