398 TILIACEAE 
Famity I.—TILIACEAE. LiInprEn Famity 
Trees, shrubs or herbs. In our area trees only. Leaves alternate 
(rarely opposite) not compound. Stipules present but small and 
falling early. Divisions of calyx generally 5, falling; petals of the 
same number when present. Stamens numerous in several united 
sets. Fruit a dry rounded berry or nutlet containing 1 or more 
seeds. 
TILIA, L. 
Trees, with simple heart-shaped leaves, one side of which developes 
larger than the other. Flowers yellowish, in clusters, the foot-stalks of 
these clusters subtended by a broad bract to which the foot-stalk is also 
to some extent attached. 
1. T. americana, L. (Fig. 9, pl. 93.) Basswoop. AMERICAN LIN- 
peN. A large tree with comparatively smooth bark. Leaves heart-shaped, 
one side larger than the other, smooth on both sides or with hairs along 
the under side of the nerves only. This is our common Basswood growing 
in woods and fields throughout our area. Blooms May and June. 
2. T. pubescens, Ait. Sournern Basswoop. Leaves rather smaller 
than No. 1, and decidedly downy or densely woolly beneath. In southern 
part of our area. 
3. T. heterophylla, Vent. Wuire Basswoop. Leaves larger than 
either of the above, White downy beneath. In New York, southern 
Pennsylvania and south from there. 
4. T. europaea, L. European Linpen. Has smaller and more regu- 
lar leaves. Our native species have scales at the base of the petals. This 
has none. Planted extensively as an ornamental tree. 
5. T. Michauxii, Nutt. Micnaux’s Linpen. Resembles T. hetero- 
phylla, but while in this the floral bract is recurrent along the flowering 
stem to its base or nearly so, in 7. Michauaii it extends within 4 in. of 
the end of the stem. Penna., and westward. 
Famity II.—MALVACEAE. Mattow Famity 
Herbs, in our area, elsewhere herbs and trees, with alternate 
leaves with small falling stipules. Flowers regular, with both 
stamens and pistils. Stamens numerous, forming a single set in 
union which forms a column around the pistil, Ovary often lobed, 
several seeded. 
Columns of stamens bearing anthers only at top 
invomere of 6 to S bractlets = sic) vo +. Bal os Althaea 
Involucre of 3 distinct bracts. 
Summit of pistil (stigma) linear. . . . . . WMalva 
