240 
turning a pale brown; terminal buds blunt, 2-2.5 em. (34-1 inch) 
long, scales ovate; leaflets irregularly serrate; flowers appear in May, 
yellow or purplish. 
Distribution. Western Pennsylvania, west along the Ohio River 
to Missouri and south to northern Alabama. Very rare in Indiana 
and found only in a few counties along the Ohio River. It is the 
largest tree of the genus In our area. 
The published records of the distribution are as follows: Clark 
(Baird and Taylor); Dearborn (Collins); Delaware (Phinney); Jay 
(M’Caslin); Jefferson (Coulter) and (Young); vicinity of New Al- 
bany (Clapp). 
Economic value. Too rare to be of any economic importance. 
TILIACEH. Tue Linpen Famtty. 
TILIA. Tue Basswoops. 
Trees with medium sized twigs; leaves alternate, mostly taper- 
pointed, oblique cordate or truncate at the base, serrate; flowers 
in axillary or terminal cymes, white or yellow, fragrant, peduncles 
of the cymes with a leaf-like bract adhering to about half their 
length; fruit nut-like, woody, 1-celled. 
Leaves smooth or nearly so beneath...............e00ee- J T. americana, 
Leaves densely white or gray pubescent beneath......... 2 T. heterophylla. 
1. Tilia americana Linneus. Linn. Basswoop.  LiInpen. 
Plate 113. Bark of old trees deeply furrowed, dark gray brown; 
twigs at the end of the season gray, brown or reddish-brown, when 
chewed somewhat mucilaginous; buds ovoid, pointed, dark reddish- 
brown; leaves ovate to orbicular, long-pointed or sometimes rounded 
at the apex, dark green above, a lighter green beneath, leaf blades 
5-15 em. (2-6 inches) long, smooth above and beneath at maturity, 
or with scattered hairs and tufts of brown hairs in the axils of the 
veins beneath, sharply toothed, the teeth ending in a gland; peti- 
oles 1/3 to 1% as long as the blades; flowers appear when the leaves 
are almost mature, June or July; bracts of the peduncles very vari- 
able, adhering to the peduncle for about half their length, about 
8 cm. (3 inches) long and 1-3 em. (#%-1 inch) wide, rounded at the 
apex, wedge-shaped or rounded at the base, smooth above and 
below; fruit woolly, globose, about 6 mm. (14 inch) in diameter. 
Distribution. New Brunswick west to Manitoba and south to 
Georgia and Texas. More or less frequent to common in rich soil 
