8 
Fourth class. 
9. 
10 . 
11 . 
12 . 
13. 
14. 
15 
16. 
17. 
18. 
19 
20 . 
21 
22 . 
23. 
24 
25. 
26. 
27. 
Leafless parasites with a filiform stem and small clustered fls 
Cuscuta. 392. 
Leafy pis ........ lO 
Floral envelope composed of cal. and cor. . . 11 
FI. envelope simple (cal. or perianth) . . . 24 
Style 1 ........ 12 
. 21 
. 13 
15 
Trapa. 188. 
14 
Styles 2—4 (Caps. Ls opp.) 
Pets 4. 
Cor. gamopetalous . 
Cor. sup. Water pis. Fr. a nut 
Cor. inf. Land pis 
Pets red, with para-cor. of 4 yellow, hood-shaped pets 
Epimedium. 22. 
Pets white. Para-cor. 0 . . . . Cardamine. 36. 
(12). Fls in a head surrounded by a calyx-like involucre. 
Ls opp. ( Dipsacece ) . . . . . .16 
Fls solitary, in whorls, heads, or spikes (comp, also some 
Labiatse— Mentha, Chaiturus and Verbena, Cl. 14) 19 
Stem prickly . .... Dipsacus. 281. 
Stem without prickles 
Recept. with hairs instead af palese 
Recept. with paleae . 
Outer cal. with 8 teeth . 
Outer cal. with a herbaceous, 4-fid, limb 
17 
Knautia. 283. 
18 
Cephalaria. 282. 
Succisa. 284. 
Outer cal. with a scarious, transparent, campanulate or 
rotate limb ...... Scabiosa. 285. 
(15). Fls solitary in the l.-axils. Cor. shorter than cal. 
Centunculus. 471. 
Fls in heads or spikes ...... 20 
Cor. (scarious) reg. with 4-partite limb and prominent stas 
Plantago. 482. 
Cor. (blue) irreg. bilabiate . . . Globularia. 480. 
(11). Cor. gamopet., 4-fid, blue . 
Pets 4, white 
Divisions of the cal. 2—3-fid . 
Divisions of the cal. entire 
Styles 4. Caps. 8-toothed 
Styles 4. Caps. 4-valved 
Styles 2. Caps. 2-valved . 
(10). Style 0 (stigs 4). Water pis 
undiv. Is .... 
Style 1. Land or bog pis 
Cor. or perianth sup. Ls entire 
Cor. or perianth inf. Ls altern. 
Ls opp., broad 
Gentiana. 388. 
22 
Radiola. 114. 
. 23 
Cerastium. 110. 
Sagina. 103. 
Buffonia. 104. 
with fls in spikes and 
Potamogeton. 532. 
. 25 
. 26 
. 27 
Isnardia. 186. 
Thesium. 497. 
Ls altern., narrow . 
Ls pinnate. Fls in dense terminal heads Sanguisorba. 176. 
Ls undiv., lobed or palmatipartite . . . . 28 
