294 GYMNOSPERMOUS EXOGENS 



1. T. OCCIDENTALS, L. Branches spreading; leaves closely op- 

 pressed, rhombic-ovate, convex on the back ; strobiles ovoid-oblong, 

 upward-recurved on the pedicels ; scales obtuse, nearly pointless. 

 WESTERN THUJA. American Arbor-vitae. 



Stem 30 to 50 feet high, with a conical top; young branches 2-edged, diverging 

 horizontally. Strobiles y z of an inch long, in racemose clusters on the recurrea 

 branchlets; scales 1-seeded; seed broadly winged. 

 Hob. Yards; cemeteries, &c. Nat. of Northern States. Fl. May. Fr. 



Obs. Cultivated as an ornamental Evergreen. In the North it is 

 regarded as a valuable tree, for its timber. The strobiles of this 

 are much smaller, and paler green, than in the following. 



Sfc. T. ORIENTALIS, L. Branches erect; leaves slightly sulcate in 

 the middle; strobiles roundish-ovoid or obovoid, erect; scales 

 acute, with conspicuous recurved or spreading points. 

 EASTERN THUJA. Chinese Arbor-vitae. 



Stem 10 to 20 feet high, usually of a ehrub-like habit, with numerous erect 

 branches from near the base, especially while young; branchlets diverging 

 vertically, or fan-like, with the edges up and down. Strobiles about half an inch 

 long, subsolitary, deep green and glaucous. 

 Hob. Yards,' &c> Nat. of China, and Japan, Fl. May. Fr. 



Obs. This is a smaller tree, and of a brighter deeper green, than 

 the preceding. It is often used for an ornamental hedge ; and is 

 decidedly better for show than service, when so employed. 



397. TAXO V I>IUM, Richard. 



[Gr. Taxos, the yew, and eidos, form; from a resemblance in the foliage.] 

 Aments in clusters, both kinds on the same branches. STAM. AMENTS 

 numerous, in a terminal pyramidal spike; stamens few, the fila- 

 ments produced into a scale-like excentrically peltate connective, 

 bearing 2 to 5 anther-cells. FERTILE AMENTS roundish-obovoid, 

 usually in pairs at the base of the staminate spike, the carpellary 

 scales acute, recurved-spreading at apex, each with 2 ovules at base. 

 Strobiles subglobose, formed of angular sub-peltate woody scales, 

 scarcely opening. Seeds 2, angular ; cotyledons 6 to 0. Trees : pro- 

 ducing singular hollow knobs, or exostoses, on the superficial roots; 

 leaves pinnately distichous, linear, delicate and deciduous. 



1. T. DIS / TICHUM, Richard. Leaflets flat, pinnately arranged on 



slender herbaceous deciduous branches, which resemble common 



petioles. 



DISTICHOUS TAXODIUM. Cypress. Bald Cypress. 



Stem 60 to 100 feet high, somewhat fastigiately branched. Leaflets % to % an 

 inch in length, on a common rachis, or herbaceous petiole-like branch, which is 1 

 to 2 or 3 inches long, often solitary, and scattered on the woody branches ; in one 

 variety (imbricaria, Nutt.), the leaflets are frequently imbricated, " after the man- 

 ner of the Junipers." 

 Hob. Lawns, &c. Nat. of Southern swamps. Fl. May. Fr. 



Obs. This stately tree which is much admired for its light 

 feathery foliage (that turns to a bright copper-color, in autumn) 

 is beginning to find a place in lawns, and other appropriate places. 

 The noblest specimen in Pennsylvania, is in the Jiartram Garden, 



