568 DIOECIA OCTANDRIA 



gin. Seeds much compressed, suborbicular, with a thin white shining mcnibrtn. 



aceous margin* 



Hob. Fence-rows ; thickets, &c. frequent. FL June-July. Fr. Octo, 



Obs. Tiwre is another species (D. quaternata, Walt. D. glauca, MuhL) emmier- 

 ated in the U. Slates; but I suspect it is scarcely more than a variety of this> 

 [Prinos vertitillatus. Hexandria Monogynia.] 

 [Hcionias dioica. Hexandria Trigynia.] 



Order 7. Octandria. 



454. POPULUS. L. JVutt. Gen. 796. 

 [Latin, Populus, the people; being used to shade public walks.] 



8taminate Fl. Aments cylindric; scales lacerately fringed at sum- 

 mit ; perianth subturbinate, oblique, entire. Pistillate Fl. Aments, 

 scale and perianth, as in the staminate flowers. Ovary superior; style 

 very short, bifid ; stigmas large, 2 or 3-lobed. Capsule 2-valved, al- 

 most 2-celled by the inflected margins of the valves.. Seeds numer- 

 ous, minute, comose. 



Trees: leaves alternate, stipular,~the petiole often laterally compresse J, and 

 biglandular, at summit ; flowers in aments issuing from lateral buds. iS«/. CrJ. 

 $1. Lindl, SalicinejE. 



1. P. tremuloides, Mx. Leaves small, cordate-orbicular, abruptly 

 acuminate, unequally dentate-serrulate, pubescent on the margin. 

 Beck, Bot. p. 323. Icojt, Mx. f. Sylva. 2. tab. 99. Jig. I. 

 P. tremuia. Marsh. Arbust. p. 107. Not! of L. Willd. Pers. and 

 J Audi. 



P. laevigata. WiUd. Sp. 4. p. 803. Ait. Kew. 5. p. 395. Lindl. Ency. 

 p. 840. Also, Pers. Syn. 2. p. 623. Notl o( Purs-h, JK*utt. Beck, Eat. 

 P. trcpida. Pursh,Am.2. p. 618. JSutt. Gen. 2. p. 239. Not! of 

 mild. Pers. Ait. MuhL Lindl. 



Trbmvla-like PoruLus. Yulgb— Quaking Asp. American Aspen. 

 • #*f»30to50 feet high, and 6 to 12 or 15 inches in diameter, branched (when 

 crowded, the stem pole-like, with few branches), the bark rather smooth and 

 whitish, or cinereous, somewhat fissured on the stems of old trees. Leaves about 

 ■2 inches long, and rather wider than long, suborbieular and slightly cordate, wilh 

 a short abrupt acuminalion, mostly without glands at base, smooth, the margin 

 unequally dentate-serrulate, somewhat undulate, and fringed (especially when 

 young) with white silky hairs ; petiole* 2 to 3 inches long, slender, smooth, sublerete 

 t nvards the base, latently compressed, or vertically dilated, near the leaf, which 

 disposes the leaf to be agitated by the slightest motion of the air; stipules small, 

 subulate-lanceolate, pubescent, caducous. Pistillate aments large (3 to 4 or 5 

 ii.ches lonj;). 

 Hub. Low grounds; Brandy wine, be. not very common. FL April. Fr. May. 



Obs. There is a considerable grove of this at Wynnes Meadows, near the sour- 

 ccs of the Brandy wine ; but it is rather scarce in other parts of the County. Ths 

 bark is a popular, and, I believe, valuable tonic. I have occasionally met with 

 specimens, apparently of a young poplar,- with the leaves targe, cordate, dentic- 

 ulate, tomentose beneath, and with 2 to 4 cup-like glands at base,-which I refer- 

 red to P, candicans, in my Catalogue ; but Dr. Pickering think! they are only th* 

 young state of the present species* 



