TILIACEAE 761 
1. Tilia Americana L. A tree, reaching a maximum height of 40 m., with a trunk 
diameter of about 1 m., the bark furrowed, its ridges flat. Leaf-blades firm, ovate or orbic- 
ular-ovate, 8-15 cm. long, abruptly acuminate, serrate with ‘acuminate gland-tipped teeth, 
oblique at the base, cordate or subcordate, essentially glabrous or minutely pubescent be- 
neath, especially in the axils of the prominent nerves when young: bracts decurrent 
nearly to the base of the peduncles: sepals ovate-lanceolate to lanceolate, 6-8 mm. long, 
acute, puberulent : petals 9-11 mm. long, pale yellow, obtuse : staminodia spatulate, nearly 
as long as the petals: berries oval, about 1 cm. long, densely tomentulose. 
In woods, New Brunswick to the Assiniboine River, North Dakota, Georgia and Texas. Early 
summer, 
2. Tilia australis Small. A tree, becoming 20 m. tall. Leaf-blades relatively thin, 
ovate to oval-ovate, 7-17 cm. long, abruptly acuminate, serrate with prominently gland- 
tipped teeth, deep green above, glaucous beneath, essentially glabrous, cordate or nearly 
truncate at the base : bracts relatively large, often 4 cm. wide, decurrent to the base of the 
peduncle or near it, glaucous, glabrous: peduncle glabrous, the free portion 2-4 cm. long: 
sepals narrowly ovate to ovate-lanceolate, 3.5-4 mm. long : petals 5.5-7 mm. long: stami- 
nodia linear-spatulate, slightly shorter than the petals : berries globular. 
On wooded hillsides, Blount County, Alabama. Late spring and early summer. 
3. Tilia Floridàna Small. A tree, sometimes 9 m. tall, with a furrowed bark. Leaf- 
blades thin, ovate or oval-ovate, 4-11 cm. long, abruptly short-acuminate, serrate with 
conspicuously gland-tipped teeth, deep green above, glaucous beneath and with scattered 
hairs when young, dust truncate or subcordate at the base: bracts relatively small, 
mostly much less than 2 cm. wide, decurrent to within 0.5 or 1.5 cm. of the base of the 
peduncle, somewhat pubescent: peduncle pubescent, the free portion 0.5-1.5 cm. long: 
sepals lanceolate to linear-lanceolate, 3-3.5 mm. long : petals 4.5-5.5 mm. long : staminodia 
nearly linear or linear-spatulate, slightly shorter than the petals: berries globular. 
In rich woods, Jackson County, Florida. Late spring and early summer. 
4. Tilia heterophylla Vent. A tree, reaching a maximum height of 30 m., with a 
trunk diameter of about 1 m., the bark furrowed, its ridges flat. Leaf-blades varying from 
orbicular-ovate to oblong-ovate, 10-20 cm. long, short-acuminate, serrate with more or less 
appressed mucronate teeth, cordate or truncate at the oblique base, silvery or closely gray- 
tomentulose beneath : bracts spatulate, decurrent to the base of the peduncle or nearly to 
it, mostly abruptly narrowed at the base, thinly pubescent or glabrate : free portion of the 
peduncle relatively long: sepals ovate-lanceolate to oblong-lanceolate, 6-8 mm. long, 
acutish : petals 8-9 mm. long: staminodia oblong-lanceolate, about } shorter than the 
petals: berries globular, 7-9 mm. long. 
In rich woods, New York to Florida, Tennessee and Alabama. Late spring and early summer. 
, 9. Tilia ebürnea Ashe. A tree, becoming 22 m. tall, the bark furrowed. Leaf-blades 
thick, ovate to orbicular-ovate, 8-14 cm. long, abruptly acuminate at the apex, sharply 
serrate, densely white-tomentose beneath, obliquely cordate or truncate at the base : bracts 
nearly oblong to spatulate, decurrent to the base of the peduncle or nearly so, Mer pubes- 
cent beneath : free portion of the peduncle short : somewhat shorter than that of T. hetero- 
eg sepals ovate-lanceolate : petals 5-6 mm. long: staminodia spatulate: berries globu- 
ar, sometimes spheroidal, 5-7 mm. long. 
E low woods or along streams, middle North Carolina to northern Georgia. Late spring and early 
6. Tilia Michaüxii Nutt. A tree, sometimes fully 30 m. tall, with a broadly furrowed 
bark. Leaf-blades thick, 7-22 cm. long, acuminate at the apex, serrate, silvery or gray- 
tomentulose beneath, cordate or sometimes truncate at the usually very oblique base : bracts 
spatulate, often elongated, decurrent to within 1 or 3 cm. of the base of the pi usually 
tapering at the base, thinly pubescent beneath: free portion of the peduncle relatively long, 
glabrous : sepals narrowly ovate to oblong-lanceolate, 4.5-6 mm. long: petals 6-9 mm. 
ad 4 Staminodia spatulate, somewhat shorter than the petals: berries mostly oval, 7-11 
- long. 
In woods, Pennsylvania and Ohio to Georgia and Alabama. Late spring and early summer. 
7. Tilia pubéscens Ait. A tree, becoming 14 m. tall, with a coarsely furrowed bark. 
Leat-blades thick and firm, broadly ovate to oblong-ovate, 8-17 cm. long, acute or abruptly 
acuminate, more or less coarsely serrate, copiously brown or rusty pubescent beneath, 
truncate or subcordate at the oblique base : bracts oblong to oblong-spatulate, decurrent to 
the base of the peduncle, copiously pubescent beneath: peduncle pubescent : sepals lance- 
olate, 3.5-4.5 mm. long: petals 6-7.5 mm. long: staminodia spatulate, about 3 as long as 
the petals : berries globit. 
In low or ri Louisiana. Late spring and 
early summon rich woods, along or near the coast, Virginia to Florida and pring 
sum: 
