1882 ARBORETUM AND FRUTICETUM. PART III.

Under that parallel, and at Halifax, in Nova Scotia, it is only 40 ft. high;but it increases in size as it gets farther south, till, on the shores of LakeChamplain, it often attains the height of 60 ft. It was first described by theyounger Michaux, and was introduced into England by the Messrs. Fraser,in 1800. From its geographical range, it is evidently fitter for the colderparts of Europe than either the preceding or following sorts. Plants, in theneighbourhood of London, grow vigorously; and, from their very large foliage,make a fine appearance, even when young. This kind must not be confoundedwith the Q. ambigua of Humboldt, which is a native of Mexico, and a totallydifferent plant (see App. viii. Mexican Oaks') ; nor with a tree marked (in 1836)Q. ambigua in the Horticultural Society’s Garden, which is intermediate be-tween Q. sessiliflora and Q. pedunculate, and may be called Q. Tiobur am-biguum, as this may be called <2. rubra ambigua. There are trees of the trueNorth American kind in the Horticultural Society’s Garden, of one of whichthe plate of this species in our last Volume is a portrait. The wood is ascoarse and open in its pores as that of the red oak; but it is stronger andmore durable; and, though unfit for wine casks, it is sometimes employed,in Canada, for the knees of schooners, and other small vessels, and bywheelwrights. As a tree to introduce occasionally in hanging woods in theHighlands of Scotland, along with the British oak, no species can be moredesirable than Q. ambigua.

y 17. Q. falca'ta Michx. The sickle-shaped, or Spanish, Oak,

Identification. Michx. Quer., No. 16. j Pursh FI. Amer. Sept., 2. p. 631.; N. Du Ham., 7. p. 169.;Lodd. Cat., ed. 1836.

Synonymes. Q. discolor Ait. Hort. Kew ., ed. 1,, 3. p. 358.; Q. elongata Willd. Sp. PI., 4. p. 444.,Ait. Hort. Kew., ed. 2., 5. p. 291., Smith in Rees's Cycl., No. 57.; Q. lyrata Lodd. Cat., 1836; <5.cuneata Wang .; Q. triloba Willd. Sp. PL, 4. p. 443., Michx. Quer., 14. No. 26.; Q. cuneataWang. Forst. ; the downy-leaved Oak.

Engravings. Michx. Quer., t 28.; N. Amer. Syl., 1.1. 23.; and owxfigs. 1750. and 1751.

Spec. Char., fyc. Leaves downy beneath, sinuated, with three or more some-what falcate bristle-pointed lobes; the terminal one elongated and jagged.Calyx hemispherical. {Willd.) Atree, varying from 30 ft. to 80 ft. high.Introduced, under the name of Q. elongata, in 1763 ; and again, under thatof Q. triloba, in 1800.

Description, SfC. This oak is a very remarkable one, from the great differ-ence which exists in its leaves and general appearance, in different climates.This difference is so extraordinary, that nearly all the botanists who havewritten on the American oaks have supposed it to be two species. In the south-