CXXYlli. BALfcJAMIFLU/E. 507 



dant, is found in woods aYid fields, disseminated throughout N. England and 

 Canada. With a trunk 18' diam., it arises 60— 70f. The buds of this 

 species, as well as of most of the poplars, are covered with an aromatic resin, 

 which may be separated in boiling Avater. April. 



5. P. MONiLiFERA. Ait. NccJclace Poplar. 



Lvs. subcordate-deltoid, smooth, glandular at base, with cartilaginous, 

 hairy, hooked serratures; veins spreading; petioles compressed above; older 

 bratiches terete ; fertile aments long and pendulous.— Banks of the Hudson, near 

 Troy, N. Y., apparently native. Deck. A tree 60— 70f high, with a cylindric 

 trunk. Leaves 2^-4' diam., on long petioles. April. 



6. P. HETEROPHYLLA. Various-leaved Poplar. 



Lvs. roundish-ovate, obtuse, uncinately toothed, cordate and somewhat 

 auricled at base, the sinus small, tomentose when young. — A tree 60 — 70f high, 

 found in swamps. Branches cylindric. Leaves with auriculate lobes at base' 

 which often conceal the insertion of the petiole. May. ' 



7. P. CANDiCANS. Ait. Bahn-of-Gilead. 



Lvs. ovate-cordate, acuminate, obtusely and unequally serrate, whitish 

 beneath, reticulate-veined, somewhat 3- veined ; petioles hirsute ; buds resinous ; 

 branches terete. — This tree is sometimes met with in New England, growing 

 about houses as a shade tree. It is 40— 50f high, and 18—30' in diameter. 

 Bark smooth, greenish. Foliage copious, dark green. Apr. 



8. P. L.EVIGATA. Ait. (P. Canadensis. Michx. and 1st. edit.) River Poplar. 



Cotton Tree. — Lvs. roundish-ovate, deltoid, acuminate, subcordate, une- 

 qually serrate, shining, smooth, glandular; ;7(?i!zo^^5 compressed ; immger bratiches 

 angled.— The cotton-tree grows 70— 80f high in N. Y. and Vt. The fertile 

 aments are 6—8' long, and pendulous. The seeds are clothed with a white, 

 cotton-like down which gives name to the tree. Buds sealed against the frosts 

 and rains with resin. April. 



9. P. ANGULATA. Water Poplar. Western Cotton Tree. 



Lvs. ovate-deltoid, subcordate, uncinate-serrate, acuminate, glabrous 

 younger ones broadly cordate ; branches winged, angular.— A tree of noble di- 

 mensions, growing along the rivers of the Southern and Western States. Trunk 

 40— 80f high, 1— 2f diam., bearing a broad summit, with coarse branches and 

 branchlets. Leaves on adult trees 2—3' long, about the same width, truncate 

 at base ; on younger trees they are 2 or 3 times larger, with a cordate base. 

 Petioles longer than the leaves, compressed near the base of the lamina. Branch- 

 lets remarkably thick, greenish, spotted with white, striate. Buds short-ovoid 

 green, not coated with resin. Timber not valuable. March, April. ' 



10. P. DiLATATA. Lombardij Poplar. — Lvs. smooth, acuminate, deltoid, ser- 

 rate, the breadth equaling or exceeding the length ; trunk lobed and sulcate.— 

 This tree is native in Italy as its name imports. It was early brought to this 

 country, and has been planted about many a dwelling and in village streets. 

 Its rapid growth is the only commendable quality it possesses, while the huge 

 worms by which it is often infested render it a nuisance. 



11. P. ALBA. Abele or Silver-leaf Poplar.— Lvs. cordate, broad-ovate, lobed 

 and toothed, acuminate, dark green and smooth above, very white-downy be- 

 neath ; fertile aments ovate ; stigmas 4.— A highly ornamental tree, native of 

 Europe. Nothing can be more striking than the contrast between the upper 

 and loAver surface of the leaves. 



Order CXXVIII. BALSAMIFLU.^.— Liquidambars. 



Trees »vith altenmtc, simi>lc or lobed leaves, with pIniKlular serratures and deciduous stipulea 

 .i/tunls monaciou.s, rounditih, with urhlamydcou.s Jlowers. 

 Sierilr.—Anth ntirnerous, obloiit'.HubsfS'Jile, with 8i!ales intermixed 

 Fertile.-Ova. 2-felk(l. collected intoa Rlobc, each surrounded hv a few scales. 

 f^y!es 2. long. J^V. n kind o» strolule, composed <,C the indurated scales and capsules. 

 iapn. 2-beaked, Scelled, opeiung between the beiikc Sds. several, winjted. 



Genas 1. species 3, natives of India. Levant and \orth America. The fragrant resin, liquid alorax, it 

 Mie pro'luct of someof th»" f^pccuy. 



43^ 



