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Rh 1899, and some of these have been grafted on the common larch and are now growing in the Arnold Arboretum, Massachusetts.

This larch in botanical characters stands nearest to L. occidentalis. Occurring at a high elevation in Shensi at about lat. 38°, it should prove perfectly hardy in this country; but must not be expected to be of much importance as a forest tree.

The remaining species, ten in number, are tolerably well known, and are readily distinguishable by the characters of the cones and flowers. In the absence of cones, the following arrangement will give a good clue to the species:—

A. Leaves deeply keeled on both surfaces.
 * 1. Larix Lyallii, Parlatore. Western N. America.
 * 2. Larix Potanini, Batalin. Western China.
 * 2. Larix Potanini, Batalin. Western China.

B. Leaves keeled only on the lower surface, the upper surface being flattened or rounded.
 * Young branchlets pubescent.
 * 3. Larix leptolepis, Endlicher. Japan.
 * 4. Larix kurilensis, Mayr. Kurile Islands.
 * 5. Larix Griffithii, Hooker. Himalayas.
 * 6. Larix occidentalis, Nuttall. Western N. America.
 * 7. Larix sibirica, Ledebour. Russia, Siberia.
 * 5. Larix Griffithii, Hooker. Himalayas.
 * 6. Larix occidentalis, Nuttall. Western N. America.
 * 7. Larix sibirica, Ledebour. Russia, Siberia.
 * 6. Larix occidentalis, Nuttall. Western N. America.
 * 7. Larix sibirica, Ledebour. Russia, Siberia.
 * 7. Larix sibirica, Ledebour. Russia, Siberia.