kxviii GENERA. 



728. CORYLUS. Barren II. Calyx a 3- cleft scale. Cor. 0. Sta. 8. Tertile. Cal. 

 superior, obsolete. Cor. 0. Styles 2. Nut solitary, covered at base with the coriaceous, jagged, 

 calyx-like involucrum. Small Trees, or Shrubs. L. alternate, somewhat round, stalked, ser- 

 rate, deciduous, p. 333. 



729. CABPIWUS. Barren Fl. Calyx the rounded scale of a lengthened catkin. Sta. 10 

 or more. Fertile. Invol. of several scales ; the outer deciduous. Cal. superior, in 3 deep, 

 acute segments, permanent. Cor. 0. Styles 2. Nut ovate, angular. Trees, with stalked, al- 

 ternate, plaited, serrate, deciduous L. p. 833. 



732. BETULA. Barren Fl. Sta. 10-12, inserted on the teruate scales of a lengthened 

 catkin; Cor. 0. Fertile. Cal. a peltate, 3-lobed, 3-flowered scale; Styles 2. Nut winged. 

 Trees, or Shrubs, with round, slender branches, and scattered, deciduous L. p. 342. 



734. PLATANUS. Catkins globose, scaly. Barren Fl. No Cal. or Cor. Sta. nume- 

 rous. Eil. very short, thickened at top. Fertile. Scales clavate ; Style simple. Nut club- 

 like, mucronate. Large Trees, with palmate L. p. 342. 



VI. MONADELPHIA. 



A. Barren Fl. in an amentum. CoNiFERiE. 

 739. PIWUS. Barren Fl. Anthers of 2 separate cells, on the under side of the scale-lil^e 

 connective. Many modern writers consider what is here called a Connective as the scale of a 

 secondary catkin, and the cells as separate anthers. In this view, Pinus would he diandrous ; 

 Cupressus and Thuja tetrandrous. p. 343. 



B. Barren as well as fertile Fl. separate. 

 710. CYTINUS. Barren Fl. Cal. ; Cor. campanulate, 4-cleft ; Sta. 8, sessile round 

 the top of the column. Fertile. Cal. ; Cor. campanulate, 4-cleft ; Stigma capitate, with 8 

 furrows. Berry with 8 ceUs, 8 parietal placentas, and many seeds. Parasitic. No L. Cytine^. 

 p. 324. 



714. CROTON. Barren Fl. Cal. 5 -parted ; Cor. 5-petaIled; Sta. 15. Fertile. Cal. 

 5-leaved; Cor. 0; Styles 3. Caps. 3-hunched, 3-seeded. The filaments are said to be some- 

 times all separate. In this case the three-hunched capsule will readily distinguish the plant. 



EUPHOKBIACE/E. p. 325. 



715. RICINUS. Barren Fl. Cal. 5 -parted; Cor. ; Pil. numerous, branched. Fertile. 

 Cal. 3-parted; Cor. 0; Style trifid. Caps. 3-hunched, 3-seeded. Euphokbiace^. p. 325. 



717. AWDRACHIyrE. Cal. 5-parted. Barren M. Pet. 5 ; Sta. 5, attached to rudiment 

 of style. Fertile. Cor. ; Styles 3. Caps, of 3 two-seeded hunches. Euphoebiace^. 

 p. 325. 



XXII. DICECIA. 

 I. MONANDRIA. Potame^. 



756. PHUCAGrROSTIS. No Cal. or Cor. Barren Fl. FU. naked, thread-like ; An- 

 thers with 4 cells and 4 cusps. Fertile. Style thread-like ; Stigma long, cloven. Germens . 

 2, compressed. Seeds 2. Habit much like that of Zostexa.. p. 349. 



II. DIANDRIA. 



730. SALIX. Catkin imbricate. Cal. a scale. Cor. 0. Nect. 1 or more glands at the 

 base. Barren Fl. Sta. 1-5, generally 2. Fertile. Stigmas 2. Caps, superior, of 1 cell and 

 2 valves. Trees, or Shrubs, with stalked, undivided, generally alternate L., and round, flexible 

 branches. Amentace^. p. 333. 



743. VALLISWERIA. Barren Fl. Sheath many-flowered ; Spadix covered with small 



