832 THE AMERICAN NATURALIST. [Vor. XXXIX. 
where they are reduced to 1 or 1 the first size. Rays somewhat resinous, 
prominent, 1 cell wide, distant upwards of 6 rows of wood cells. i 
Radial— Rays somewhat resinous. Cells (1), the upper and lower walls 
rather thick and often strongly pitted ; the terminal walls thick and strongly 
though finely pitted. Cells (2) more resinous, often predominant; a 
upper and lower walls thin and not pitted; the terminal walls, thicker ant 
Strongly though finely pitted, the pits on the lateral walls forming a promi- 
nent sieve-plate structure. 
Tangential. — Rays numerous, resinous, narrow, chiefly medium, Cells 
(1) somewhat variable, chiefly oblong or again broadly oval; chiefly equal. 
Cells (2) uniform and narrowly oblong; very unequal and often several 
times higher than broad. 
7. S. lancifolia Anderss. 
Transverse. — Growth rings broad ; the limiting wood parenchyma resin- 
ous and prominent. Vessels rather large and strongly predominant through- 
out, radially oval and 2- to 3- rarely 4-compounded ; diminishing very gradu- 
ally in size to the outer limits of the growth ring where they are about two 
thirds the first diameter, 
Cells (1), the upper and lower walls thick and 
unequally though often strongly pitted; the terminal walls thick and 
strongly though finely Pitted. ^ Cells (2), the upper and lower and ter- 
minal walls thick and strongly pitted ; the pits on the lateral walls forming 
a Coarse sieve-plate structure. 
Tangential.— Rays numerous, resinous, narrow, medium. Cells (1) chiefly 
uniform and oblong, but varying somewhat from oval to oblong ; unequal 
and often twice as broad or twice as high. Cells (2) much less resinous, 
uniform, narrowly oblong, unequal. 
8 S. brachystachys Benth. 
Radial. — Rays non-resinous. 
thin and not obviously pitted ; th 
(2), the upper and lower walls thi 
Cells (1), the upper.and lower walls rather 
e terminal walls with very fine pits. Cells 
n and not pitted; the terminal walls some- 
