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II. Adult leaves densely tomentose beneath, margin entire or minutely and remotely toothed.

* Lobes elongated.

3. Platanus racemosa, Nuttall, Sylva, i. 47 (1842). A tree, attaining 120 feet in height and 18 feet in girth, common on the banks of streams in California. Introduced on the Continent, unknown in cultivation in Britain.

Leaves three- to five-lobed to below the middle; lobes acuminate, tomentose on both surfaces; occasionally with remote minute teeth; base slightly cordate or truncate. Fruiting heads bristly, two to seven on the peduncle. Achenes with ring of basal hairs, elsewhere glabrous; apex pyramidal or rounded, without a central depression; style long.

4. Platanus Wrightii, Watson, Proc. Am. Acad. x. 349 (1875). A tree, attaining 80 feet in height and 15 feet in girth, common in mountain cafions up to 6000 feet altitude in Southern New Mexico and Southern Arizona in the United States; and in Sonora in Mexico. Not introduced.

Leaves three- to five-lobed to below the middle or near the centre; lobes acuminate, usually quite entire, tomentose on both surfaces, deeply cordate at the base. Fruiting heads smooth, two to four, racemose on the peduncle. Achenes with ring of basal hairs, elsewhere glabrous; apex rounded, with a central depression, from which arises a short style.

** Lobes short and broadly triangular.

5. Platanus mexicana, Moricand, Bull. Ferr. Bot. 79 (1830). A large tree in Mexico, in Nuovo Leon and the provinces to the south of it; frequently planted in the cities of North-Eastern Mexico; the handsomest of all the plane trees.^[1] Not introduced.

Leaves three- to five-lobed, densely white tomentose beneath, base truncate or cuneate. Fruiting heads bristly, solitary. Achenes with ring of basal hairs; upper part of the body pubescent; apex pyramidal, continued directly into the long style.

6. Platanus Lindeniana, Martens et Galeotti, Bull. Acad. Brux. x. 2, p. 343 (1843). Tree, 100 to 150 feet in height. South Mexico, near Jalapa, at 4000 feet altitude. Not introduced.

Leaves with usually three very short lobes, ending in long bristle-like points, densely rusty tomentose beneath; base truncate. Fruiting heads bristly, several on the peduncle. Achenes as in P. orientalis.

 

1. Garden and Forest, ix. 51 (1896).