CL. XXI.] MON(ECIA MONANDRIA. 345 



20. QUEHCUS. Barren flowers in a loose catkin. Calyx divided 

 into several segments. Corolla none. Stamens eight or more. 

 Fertile flowers. Calyx double; the outer inferior, scaly, undi- 

 vided ; the inner superior, with six deep segments. Corolla 

 none. Style one. Nut solitary, closely invested at its base with 

 the hemispherical outer calyx. 



24. CO'KYLUS. Barren flowers in a cylindrical catkin. Calyx a 



three-cleft scale. Corolla none. Stamens eight or more. 



Fertile floicers. Calyx double ; the outer inferior, divided ; the 

 inner superior, minute. Corolla none. Styles two. Nut soli- 

 tary, hard, invested by the enlarged, leathery, outer calyx. 

 23. CARPI'NUS. Barrenflowers in a cylindrical catkin. Calyx a 

 rounded scale. Corolla none. Stamens ten or more. 



Fertile flowers. Calyx double ; the outer inferior, of several 

 deciduous scales ; the inner superior, with three deep, egg- 

 shaped, acute, permanent segments. Corolla none. Styles two. 

 Nut egg-shaped, angular, naked. 



22. BE'TULA. Barrenflowers in a cylindrical catkin. Calyx a 

 ternate scale. Corolla none. Stamens ten or twelve. 



Fertile flowers in an oblong catkin. Calyx a three-lobed, three- 

 flowered scale. Corolla none. Styles two. Nut winged, de- 

 ciduous. 



18. A'RUM. Common calyx a sheath inclosing a common stalk, 

 naked above. Corolla none. 



Barrenflowers. Stamens numerous, in a dense ring, surmounted 

 by a ring of abortive filaments. 



Fertile flowers. Germens numerous, in a dense ring beneath the 

 stamens, sessile. Styles none. Stigmas downy. Berry one- 

 celled, with several seeds. 



Order VII. MONADELPHIA. Filaments united. 



25. PI'NUS. Barrenflowers in a catkin, naked. Stamens numerous, 



on a common stalk. 



Fertile flowers in a catkin of imbricated, close, stiff, two-flowered 

 scales. Seeds two to each scale, winged. 



MONGECIA. MONANDRIA. 



1. EUPHO'KBIA. SPURGE. 



Involucre of one leaf, with four or five marginal lobes, per- 

 manent, containing several barren flowers, and one central fertile 

 flower, all destitute of calyx and corolla. Nectaries four or five, 

 fleshy, tumid, abrupt, coloured. 



Barren flower. Filament simple, hair-like, erect. Anther of 

 two globular separate lobes. 



Fertile flower. Germen roundish, three-lobed. Styles three, 

 equal, cleft, spreading, permanent. Stigmas bluntish. Capsule 

 roundish, three-lobed, three-celled. Seeds one in each cell, 

 large, roundish. Named after Euphorbus, physician to Juba. 



20. 

 2G 



