SYNOPSIS OF THE GENERA. 
*** Barren and fertile flowers in catkins. 
24. Carpi’nus, [Page 1215] Barren flowers in long cylin- 
drical catkins, its scales roundish, ciliated at the base, 
Stamens eight to twenty. Fertile flowers in lax catkins, 
its scales large, leafy, three lobed, single flowered. 
Perianth scale-shaped, three lobed, two flowered, adhering 
to the ovary. Ovarium two celled, one abortive. Styles 
two. Fruit an ovate striated one seeded nwt. 
25. Br’ruta, [Page 1216.] Barren flowers in cylindrical 
catkins, its scales three flowered, the middle one bearing 
stamens. Fertile flowers in cylindrical catkins, its scales 
three lobed, three flowered, membranous. Styles two, 
ovary, compressed, two celled, one of the cells abortive- 
Fruit a compressed one celled nuf, with winged margins. 
xxx Flowers with a double perianth. 
26. Myropuy'ttum, [Page 1220.] Barren flowers. Calyx 
inferior, fonr partite. Petals four, alternating with the 
lobes of the calyx. Stamens eight. Fertile flowers. 
Calyx four lobed. Petals four, or wanting, Stigmas 
four, sessile. Fruit four nuts, compressed, sub-globose, 
single seeded.—Floating herbs, rising above the water at 
the time of flowering. 
27. Sacirta’r1a, [Page 1221.] Barren flowers. Calyx of 
three pieees. Petnls three. Stamens numerous. Fertile 
flowers. Calyx of three pieces. Petals three. Ovaries 
numerous, on a globose receptacle. Capsules small, 
: compressed, margined, single seeded. 
OrperR VIII. Monopretpu1a.—Stamens united into one set. 
28. Pi'nus, [Page 1222.] Barren flowers crowded into ter- 
minal racemose catkins, the scales peltate, bearing two, 
single celled anthers. Fertile flowers in compact ovate 
catkins or cones, its scales acuminate, closely imbricated, 
two flowered. Ovaries two. Stigmas glandular. Nuts 
in pairs, single seeded, terminated by a long winged 
membranous appendage. 
