PINETUM BRITANNICUM. 
times in as many as five, and fometimes interrupted, and at the point terminating in two: the normal 
number is three. 
The difpofition or diftribution of the ftomata is a fpecific character of which we do not think fo much 
ufe has been made as might have been. Applying it to the fedtion Strobus (to which our prefent fpecies 
belongs), it would give the following eafy dichotomous table for difiinguifhing the fpecies by infpedtion of a 
fragment of the leaf, viz.: 
Strobus. 
Stomata on the back as well as on the two Tides of the leaf, 
Stomata on the Tides but not on the back of the leaf, . 
Stomata arranged in five rows, placed clofely together, 
Stomata arranged in fewer than five rows, 
Stomata arranged normally in four rows, 
i Stomata arranged normally in three rows, 
Stomata arranged normally in two rows, 
P. Lambertiana. 
2 
P. excelfa. 
o 
P. Ayacahuite. 
P. monticola. 
P. Strobus. 
Fig. 2. 
As the number of rows varies in exceptional cafes, in the fame way as the number of leaves in a 
fafciculus itfelf varies, fuch a table as the above cannot be taken as abfolute, but merely as a ufeful adjunct 
to more detailed defcription. 
The origin of the young leaves, at and towards the ends of the branches, is furrounded 
by a bradt or fheath, compofed of three leaflets, there being none on the fide 
next the ftem [fig. 2]. This foon drops off. The older leaves then fpring from a 
cortical tumour or corrugated eminence [fig. 3]. 
The odour of the cut twig of Pinus Lambertiana is peculiar, and quite diftindf from 
that of any other Pine we have met with. It has a dafh of lemon in its flavour. The bark 
is fmooth. On the fouthern fide of the tree, pale brown ; on that looking to the north, whitifh. 
Cotyledons, 12-13. Mature cones, growing dependent towards the ends of the branches, 
from 12 to 18 inches long, and 35 to 4 inches in diameter at the broadeft part, of an elongate 
conical fhape, flightly curved, but without any difference between the fcales on the outer and 
inner fide. Scales 2\ inches in length, and ij inch acrofs at the broadeft part, with a 
fmall tranfverfe umbo, reminding us of the nail at the end of a duck’s bill. Seeds winged, large fub-oval 
(one fide fomewhat angular), dark brown, three-quarters of an inch in length, and half an inch acrofs. 
Wings membranaceous, femi-tranfparent, including the feeds ij inch in length and three-quarters of 
an inch acrofs, fuliginous in colour, with a multitude of finuous veffels interfperfed over them ; crimfon 
when frefh, blackifh when dry, and forming a beautiful objedl under the microfcope. Tefta cruftaceous, 
cracking eafily under preffure. Buds about an eighth of an inch long and an eighth of an inch broad, 
roundifh and pointed, with fmaller buds befide it. 
Fig- 3 - 
Defcription. — This fpecies belongs to the fedtion of Pines known as the “ Weymouth Pines.” 
It is clofely allied to Pinus Strobus of the Eaftern States of North America, and Pinus excelfa of the 
Himalayas. It exceeds all trees of the Pine genus in height and magnitude, coming undoubtedly, of all 
productions of the vegetable kingdom, next, in thefe particulars, to Wellingtonia gigantea and Sequoia 
fempervirens. 
The mature tree reaches a height of 300 feet, with a diameter of 20 feet at the bafe. It is not often, 
however, that it reaches thefe extreme dimenfions. Even where it is abundant, and the general growth 
vigorous, it is rare to find a tree more than 10 feet in diameter and 200 feet in height. Mr Blake, in his 
Geological Report (U. S. Pacific Railroad Reports ), [peaks of a trough which he faw ufed for mining pur- 
pofes, cut from a Angle log, 20 feet long, 3 feet wide, and 2 feet deep. The trunk generally Hands without 
flaw or flexure, a perpendicular cone, with all its tranfverfe fedtions accurately circular; it is ufually without 
branches for about two-thirds of its height. Douglas fays that “ the branches are pendulous, and form an 
open 
