110 
SILVA OF NORTH AMERICA. 
CONIFER. 
The specific name commemorates the horticultural and botanical labors of James MacNab,’ the 
distinguished curator of the Edinburgh Botanic Garden. 
1 James MacNab (April 25, 1810-November 19, 1878), the son 
of William MacNab, curator of the Edinburgh Botanic Garden 
from 1810 to 1848, was born in Richmond, near London, and 
learned the theory and practice of horticulture under his father at 
Edinburgh. From 1829 to 1834 he served as clerk and assistant to 
the secretary of the Caledonian Horticultural Society, and in 1834 
visited America, and traveled extensively in Canada and the United 
States, where he made a large herbarium and collections of living 
plants and seeds. An account of the interesting plants which he 
gathered during this journey was published in the Edinburgh Philo- 
sophical Journal of 1835 and in the early volumes of the Transac- 
tions of the Botanical Society of Edinburgh. Returning to Scotland 
in 1835, Mr. MacNab was appointed superintendent of the gardens 
of the Caledonian Horticultural Society at Inverleith, and held this 
position until the death of his father, whom he succeeded in the 
curatorship of the Edinburgh Botanical Garden, continuing to man- 
age this institution during the remainder of his life, and greatly 
improving and enlarging it. He was one of the founders of the 
Edinburgh Botanical Society, and in 1872 served as its president. 
One of the best practical gardeners of his time, James MacNab 
was also the author of numerous papers on botany, horticulture, 
and arboriculture. 
EXPLANATION OF THE PLATE. 
PLATE DXXVIII. Cupressus MAcNABIANA. 
CWONATE WN HE 
ray 
) 
. An embryo, enlarged. 
ay 
. A leaf, enlarged. 
f 
bo 
A flowering and fruiting branch, natural size. 
A staminate flower, enlarged. 
. A stamen, front view, enlarged. 
A pistillate flower, enlarged. 
A scale of a pistillate flower with ovules, front view, enlarged 
. A scale of a cone with seeds, lateral view, enlarged. 
. A seed, back view, enlarged. 
. A seed, front view, enlarged. 
. Vertical section of a seed, enlarged. 
. Cross section of a branchlet, enlarged. 
