Twenty-second, twenty-third, twenty-fourth class. 
47 
— Fl.-envelope simple, (a perianth) .... 27 
24. Ls compound.Spiraea. 164. 
— Ls undiv. . . _- . . . . . . 25 
25. Several carpels separated almost to the base, and de¬ 
hiscing on the inner side by a longitudinal slit. Ls altern. 
Sedum. 206. 
— Fr. a caps., opening by 6 or 10 teeth. Ls opp. . 26 
26. Styles 5. Caps, with 10 teeth . . lYIelandrium. 97. 
— Styles 3. Caps, with 6 teeth . . . Silene. 95. 
27 (23). Ls altern. or in clusters . . . . 28 
— Ls, at any rate the lower ones, opp. . . . 2!) 
28. Styles 3, with a multifid stig. Ls broad Rumex. 491. 
— Style 1, with a very short stig. Ls linear Asparagus. 571. 
29. Ls digitate, with 5—9 leaflets. Stas 5. Stigs 2. Hemp 
Cannabis. 506*. 
— Ls not divided ....... SO 
30. FIs in panicles placed in the leaf-axils, the males with 
4 stas, the females with 1 brush-like stig. Urtica. 505. 
— Male fls in interrupted spikes, with 9—12 stas, fem. fls 
1—3 together in the leaf-axils; with 2 stigs 
IVIercurialis. 504. 
Cl. 23. Polygamia. 
The pis placed by Linnseus in this class have been distributed among 
the other classes according to the construction of their hermaphrodite fls. 
Cl. 24. Cryptogamia. 
In this work only the more highly organised Cryptogams are treated of, 
viz. the vascular Cryptogams. 
1. Pis growing at the bottom of stagnant water. (Fr. at 
the base of the ls) ...... 2 
— Land pis, sometimes also standing in water, but never 
submerged or floating ...... S- 
2. Ls with long petioles, formed of 4 obcordate-cuneiform 
leaflets.Marsilea. 675. 
— Ls without petioles, subulate . . . . S 
3. Stem reduced to the form of a bulb. Ls in clusters 
Isoetes. 676. 
— Stem filiform, creeping. Ls isolated Pilularia. 674. 
4 (1). Ls 0 (or, more correctly, transformed to a sheath crowned 
with teeth). Stem articulate, simple or with whorled 
branches. Fructification terminal, in the form of a cone¬ 
like spike Equisetum. 679- 
— Ls present ........ 5 
