, strongly flattened at right angles to the plane of the
blade; stipules thread-like, soon falling.

=Inflorescence.=--March to April. Sterile catkins 1-3 inches long,
fertile at first about the same length, but gradually elongating;
bracts cut into several lanceolate divisions, silky-hairy; stamens about
10; anthers red: ovaries short-stalked; stigmas two, 2-lobed, red.

=Fruit.=--Fruiting catkins at length 3-6 inches long; capsule conical,
acute, roughish-scurfy, hairy at tip: seeds numerous, hairy.

=Horticultural Value.=--Hardy throughout New England; grows almost
anywhere, but prefers moist, rich loam; grows rapidly and is safely
transplanted, but is unsymmetrical, easily broken by the wind, and
short-lived; seldom offered by nurserymen, but readily procured from
northern collectors of native plants. Useful to grow for temporary
effect with permanent trees, as it will fail by the time the desirable
kinds are well established. Propagated from seed or cuttings.

=Note.=--Points of difference between _P. tremuloides_ and _P.
grandidentata_. These trees may be best distinguished in early spring by
the color of the unfolding leaves. In the sunlight the head of _P.
tremuloides_ appears yellowish-green, while that of _P. grandidentata_
is conspicuously cotton white. The leaves of _P. grandidentata_ are
larger and more coarsely toothed, and the main branches go off usually
at a broader angle. The buds of _P. grandidentata_ are mostly divergent,
dusty-looking, dull; of _P. tremuloides_, mostly appressed, highly
polished with a resinous lustre.

[Illustration: PLATE XV.--Populus grandidentata.]

1. Branch with sterile catkins.
2. Sterile flower, back view,
3. Sterile flower, front view.
4. Branch with fertile catkins.
5. Bract of fertile flower.
6. Fertile flower, front view.
7. Fruiting branch with mature leaves.
8. Fruit.
9. Fruit.

=Populus heterophylla, L.=

POPLAR. SWAMP POPLAR. COTTONWOOD.

=Habitat and Range.=--In or along swamps occasionally or often
overflowed; rare, local, and erratically distributed.

Connecticut,--frequent in the southern sections; Bozrah (J. N. Bishop);
Guilford, in at least three wood-ponds (W. E. Dudley _in lit._), New
Haven, and near Norwich (W. A. Setchell).

Following the eastern coast in wide belts from New York (Staten
island and Long island) south to Georgia; west along the Gulf coast
to western Louisiana, and northward along the Missis