SYNOPSIS OF GENERA. XXXlii 



5 or 6. Nuts 2 or 3, loosely invested with the spreading outer calyx. Amen- 

 tacece, p. 254. 



Castanea. See Amentaceas, p. 255. 



Quercus. Barr. fl. in a catkin. Cal. in several segments. Cor. none. 

 Stam. 8 or more Fert. fl. Cal. double ; outer inferior, scaly, undivided ; 

 inner superior, in 6 deep segments. Cor. none. Style 1. Nut solitary, 

 closely invested at its base with the hemispherical outer calyx. Amentacece, 

 p. 255. 



Corylus. Barr. fl. in a catkin. Cal. a 3-cleft scale. Cor. none. 

 Stam. 8 or more. Fert. fl. Cal. double ; outer inferior, divided ; inner 

 superior, obsolete. Cor. none. Styles 2. Nut solitary, bony, invested with 

 the enlarged, coriaceous, jagged outer calyx. Amentacece, p. 256. 



Carpinus. Barr. fl. in a catkin. Cal. a rounded scale. Cor. none. 

 Stam. 10, or more. Fert. fl. Cal. double ; outer inferior, of several deci- 

 duous scales ; inner superior, in 3 deep, sharp segments, permanent. Cor. 

 none. Styles 2. Nut ovate, angular, naked. Amentacece, p. 25G. 



Betula. Barr. fl. in a catkin. Cal. a ternate scale. Cor. none. 

 Stam. 10 — 12. Fert. fl. in a catkin. Cal. a peltate, 3-lobed, 3-flowered 

 scale. Cor. none. Styles 2. Nut winged, deciduous. Amentacece, p. 242. 



Arum. Common Cal. a sheathing leaf, enclosing a common stalk, naked 

 above. Cor. none. Barr. fl. Stam. numerous, in a dense ring, surmounted 

 by another ring of abortive filaments. Fert. fl. Germ, numerous, in a dense 

 ring, below the stamens, sessile. Styles none. Stigmas downy. Berry with 

 several seeds. Aroidecs, p. 201. 



Order VIII. Monadelphia. Stamens united into one set. 



Pinus. Barr. fl. in a catkin, naked. Stam- numerous, on a common 

 stalk. Fert. fl. in a catkin, of close, rigid, 2-lipped, 2-floweied scales. Seeds 

 2 to each scale, winged. Coniferce, p. 258. 



Class XXII. Dicecia. Stamejis and Pistils in separate flowers, 

 on different plants. 



(Monandria. 1 Stamen. For some Salices sec Ord. II.) 

 Order I. Diandria. Stamens 1 — 5, mostly 2. 



Salix. Barr. fl. Catkin imbricated. Cal. a scale. Pet. none. Nect. 

 1 or more glands, at the base. Stam. 1 — 5. Fert. fl. Catkin imbricated. 

 Cal. a scale. Pet. Done. Nect. as in the barren fl. Stigm. 2. Capsule 

 superior, of 1 cell, and 2 valves. Seeds tufted. Amentacem, p. 243. 



Order II. Triandria. Stamens 3. 



Emfetrum. Barr. fl. Cal. in 3 deep segments. Pet. 3. Stam. ca- 

 pillary, 3—9. Fert. fl. Cal. in 3 deep segments. Pet. 3. Stigm. 9. 

 Berry superior, with 9 seeds. Empetrea, p. 238. 



(See Valeriana dioica in CI. III. Some Salices in Ord. I.) 



Order III. Tetrandria. Stamens 4. 



Myrica. Barr. fl. in a calkin. Cal. a concave scale. Cor. none. 

 Fert. fl. in a catkin. Cal. a concave scale. Cor. none. Styles 2. Beriy 

 superior with 1 globular seed. Myricea:, p. 257. 



