I"»l CASl'AItlNArK.K. 



2. POPULUS, Tunni. CorroNwooi., I'on.AU, Asi-en. 



Hrai'ts of tlie iiiiiciitM tontlicil or Inltcil. Flowers from an ol(li(|Uc ('ii|)-slia|t(-(l 

 ili-k. Stamons few or miiiu'roiis, with tlu- lilaiin-nts fne. .Stiyiiiius cloriffaled, 

 2 jiarttMi. — 'IVecs. Leaves ovate or rouiidisli, on I<jn<^ ami often laterally 

 coin|tres.se(i petioles. Hiids covered with iinlirieated, t»ften resiuous-coated 

 scales. Anieiits .slender, droojiiug, ajipearing before the leaves. 



I- P. angulata, Ait. liranches thick, smooth, ami shar|)ly angled; 

 IraMs lariic, smooth, delloid-ovate, acute or slightly acnniinaie, truncate at 

 the Itase, olitn.sely serrate with incurved teeth; the conspicmms veins and 

 compressed ])etiole yellowish. — Hanks of rivers. March- Ajiril. — A large 

 tree. Leaves 6'- 8' long, longer than the i)etiole. 



2. P. grandidentata, Mich.x. branches terete; leaves round-ovate, 

 acute, sinnatc-tootlicd, hoary -tomentose when young, like the hranchlets, at 

 length smooth, scarcely longer than the slender compressed petiole; fruiting 

 amcnts elongated, ])uliesceiit. — Low wo<j(is in the upper districts. March - 

 A]iril. — A nuddlesizeil tree, with smooth gray hark. Leaves 3' -5' long, 

 and nearly of the same width. 



3. P. heterophylla, L. Rranche.s terete ; leaves ovate, mostly obtuse, 

 serrate, with ohtuse, incurved teeth, rounded or with a small siuus at the base, 

 hoary-tomentose on both sides when young, like the nearly terete petioles and 

 hranchlets, at length only on the veins beneath ; fruiting aments smooth. — 

 Hirer swamps in the middle and upper districts. March -April. — A large 

 tree. L('a\i\s .3'-;")' long. 



4. P monilifera, Ait. Hranchlets obtu.seiy angular; leaves deltoid- 

 ovate, acuminate, serrate (3'- 10' long); fertile aments long and .slender; 

 stigma large, toothed ; capsule oblong-ovate. — liiver banks, Florida, and 

 northward. — A large tree. 



Order 133. CASUAKINACE^. 



Trees or .shruhs, with leafless jointed furrowed branches, like Equi- 

 setnin. Flowers in si:»ikes, monoecious or dioecious, the staminate ones 

 in whorLs at the joints, monandrous, 4-l)racted, the pistillate flowers 

 capitate, without floral envelopes. Ovary 1 -celled, with 1-2 or- 

 thotropous ovules, foi-ming in fruit a winged acheniuin. Styles 2. 

 Albumen none. Radicle superior. 



1. CASUARINA, Rumpb. 

 Characters of the Order. 



1. C. equisetifolia, Forst. P.ranchos filiform, simple; furrows 6-8; 

 teeth of the sheaths as many, keeled on the back ; staminate spike terminal, 

 the pistillate lateral, short-peduncled. — Keys of South Florida ( Curtiss). 



