38 CALLITRIS. 



Cones, globular or somewhat four-sided, and composed of four 

 valved woody scales, the alternate pair much the smallest. 



Valves or Scales, in opposite pairs, regularly truncated on 

 the top, and four in number. 



Seeds, one or two at the base of each scale or valve, the larger 

 pair of scales having two seeds each, the smaller pair but one 

 under each ; seeds winged on each side, slightly compressed, 

 and somewhat three-edged. 



Seed-leaves, from three to six in number, but mostly in fours. 



Leaves, very small, scale-formed, in alternate opposite pairs, 

 close together at the base of the joints. 



Name derived from ' Kallos,' beauty, from the elegant and 

 regular appearance of the jointed branchlets. 



Tree, native of Barbary and the North of Africa. 



Callitris quadriyalvis, Ventenat, the Jointed Arbor- Vitae. 



Syn. Thuja articulata, Wahlenberg . 



„ Frenela Fontanesii, Mirbel. 



f, Thuja infequalis, Desfontain. 



Leaves, very small, scale-formed, in alternate opposite pairs, 

 close together at the base of the distant joints, and facing four 

 successive ways, those on the margins clasping both sides, those 

 on the upper and lower sides flat, with a terminal point, and 

 small transparent gland near their extremity ; those on the adult 

 branches are very much smaller and decurrent. Branches, 

 spread out horizontal, with numerous lateral ones, regularly 

 dividing again into flattened, slender, jointed, shining, smooth, 

 pale green branchlets ; branchlets, numerous, regularly branch- 

 ing, quite flat, glabrous, sometimes giaucescent, distantly jointed, 

 and straight. Cones, globular, somewhat quadrangular, and 

 consisting of four scales or valves, in opposite pairs, regularly 

 truncate on the summit, slightly concave and obtuse ; the 

 two opposite ones much longer, seldom convex, but terminating 

 in a point at the extremity, and containing one or two double- 

 winged seeds in each. 



A large tree, diminishing into a small bush, according to 



