332 
IOWA ACADEMY OF SCIENCE Voi, XXIX, 1922 
Cult. rare. 
Nursery. 
Nfd. to Pa., Minn., Man. and northward. 
FI. Fr. 
Note: A valuable, hardy and vigorous ornamental, and important 
source of yellow pine lumber. 
7. P. nigra austriaca Austrian Pine 
Tree with very coarse, grey-black bark; branchlets light brown. 
Buds not over twice as long- as thick. Lvs. in 2’s, 6-14cm. long, 
very stout and stiff, dark green. 
Cones broad, 5-8cm. long, glossy ; scales thickened, with a short 
prickle. Resin canals of leaf in midst of parenchyma. 
Cult, common. 
Campus ; 4th and East Sts. 
S. e. Europe. 
FI. May. Fr. Oct. 
8. P. pondEROSA Ponderous P. Western Yellow Pine 
Tree with coarse brown bark. Lvs. in 2’s and 3’s, 12-16cm. 
long. Buds large, candle-like, 3-6 times longer than thick. 
Cones 8- 15cm. long, brown and shiny; scales thickened, with a 
stout recurved prickle. Resin canals in midst of parenchyma of 
leaf. 
Cult. rare. 
Campus ; nursery. 
B. C. to Mex., east to Neb. and Tex. 
FI. May Fr. 
2. Larix Larch 
(The classical name) 
Cone-shaped deciduous trees of large size. Lvs. needle-shaped, 
soft, 2-3cm. long, in clusters on knoblike, black short-shoots. 
Cones l-5ctn. long, soft, numerous. 
Stam. fl. globular, dull yellow, drooping ; pollen globular, not 
winged. Pist. fl. erect, conelike, bright red. 
1. Cones 2.5-3cm. long; tree symmetrical i. L. decidua 
1. Cones l-2cm. long; branches crooked 2 . L. laricina 
1. L. decidua Deciduous L. European Larch 
Cones 2-3cm. long. Tree with straight trunk, straight branches 
and slender, drooping branchlets. 
Bract shorter than seminiferous scale, erect, or incurved; scale 
finely downy on the back ; lvs. without white lines beneath. 
