CXXVlll. BALSAMIFLUvE. 50? 



dant, is found in woods and 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 water. April. 



5. P. MONiLiFER.i. Ait. Necklace Poplar. 



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

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

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

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

 trunk. Leaves 2i — 4' diam., on long petioles. April. 



6. P. HETEROPHYiXA. Various-leavcd 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. Balm-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^viGATA. Ait. (P. Canadensis. Michx. and \st. edit.) River Poplar. 

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



qually serrate, shining, smooth, glandular ; ^e^iofes compressed ; younger brandies 

 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 tlie rivers of the Southern and Western States. Trunk 

 40— 80f high, 1— 2f diam., bearing a broad smnmit, 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. Lombardy Poplar. — Ijvs. 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. Abcle or Silver-leaf Poplar. — Lvs. cordate, broad-ovate, lobed 

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

 neath ; fert'de aments ovate ; stigmas 4. — A highly ornamental tree, native of 

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

 and lower surface of the leaves. 



Order CXXVIII. BALSAMIPLU.^.— Liquidambars. 



Tre.es with alternate, simple or lobed leaves, with glandular serratures and deciduous stipules 

 .Aments raonacious, roundish, with achlamydeous tiowers. 

 Sterile.— Anth. numerous, oblong, subsessile, with scales intermi,xed. 

 fertile.— Ova. 2-celled, collected into a globe, each surrounded bv a ftw scales. 

 StJjles 2. long. Fr. a kind of strsbile, composed of the indurated scales and capsules. 

 Caps. 2-beaked, 2-celled, opening between the beaks. Sds. several, winged. 



Genus I, species 3, natives of India. Levant and North America. The fragrant resin, liquid storax, 

 the product of some of the species. 



13* 



