24 TRANS. ST. LOUIS ACAD. SCIENCE. [184 
have been collected at Tomales Point with subterminal cones, not differ- 
ent in any other respect. The cones of the southern specimens (from 
Monterey, etc.) have usually very long, 14g inch, and stout curved spurs, 
especially on the outer side, and fully deserve their specific name, but oth- 
rs from farther north (Mendocino, etc.) are more regular, with short and 
thin, age very sharp, prickles 
inaster, Ait. The joule flowers form a large oval head ; invo- 
cally and pina this species is more nearly allied with P. Canar?- 
ensis, less so with Laricio, but is distinguished from both by the lateral 
(quite cele Casas female ament. 
38. P. mitis, Michx. Wide-spread through the middle and partly the 
; 
species of pine; it is found always on silicious soil; it fur- 
sists excellent ‘‘hard pine” lumber. The outer pair of the 9-12 involucral 
bracts is scarcely half as long as the inner ones. 
39. P. glabra, Walt. Similar to the last, with slender foliage, smoother 
bark (in young trees and on the branches the grayish bark is quite smooth) 
and almost unarmed cones, JPorera gir by Walter 100 years ago, but 
W. Rav 
where it grows on the edge of or in swamps, and on the knolls in them, 
with Magnolia, Fagus, and pnsead! gees on sandy soil, and never in the 
so called Pine-barrens. He describes the branching of the tree as singu- 
larly characteristic, the spray u scaniie ts flattened somewhat ae biad 
of Cedrus. It probably — throu the lower parts of t 
e 
leaves are usually 2$ to 3 inches long, not half as thick as they are wide, 
while in P. mitzs their sate exceeds half their es the external in- 
volucral bracts are min 
so. PF. Banksigna, wad , published 1803 in Lambert’s first edition, a 
with erect or at least patulous cones; the small prickles of a ee SN 
cones soon disappear, so that the mature ones are unarm The b 
of the wing entirely covers the outer side of the seed and ates 0 
it, just as it does in Picea, and which I have not seen in any other pine 
to this extent. The cones are often serotinous and persist for a long time. 
The seeds seem to germinate most readily, just like those of P. Teda, and 
20 or 30 feet high, and 10-12 or very rarely 18 inches in diameter. Very 
