46 
Twenty-second class. 
— Trees or shrubs with larger Is (gen. decid. in autumn) 
6 
5. False berry globular, closed, blackish blue. Ls in whorls 
of 3. Juniperus. 669. 
— False berry saucer-shaped, open above, red. Ls arranged 
in 2 rows along the branches . . Taxus. 668. 
6. Ls pinnate. Stas 2. Fr. a samara . . Fraxinus. 380. 
— Ls simple, undiv. or lobed 
7. FIs in catkins ..... 
— FIs not in catkins. 
8. Periath cup-sliaped. Stas 8—30. Poplar Populus. 523. 
— Perianth reduced to 1 or 2 glands. Stas 1—10 (gen. 2). 
Willow .Salix. 522. 
9. Ls palmatilobed ..... 
— Ls undivided. 
10. Stas gen. 8. Ls opposite .... Acer. 120. 
— Stas 5. Ls altern. (or in clusters) . Ribes. 209. 
11. Stas 3. Seps and pets 3 ... Empetrum. 501. 
— Stas 4—12 .. 12 
12. FIs supported by ls (or more correctly by branches en¬ 
larged like ls). Ruscus. 577. 
— FIs not supported by ls .... 13 
13. Pets small, greenish. Style 2—4-fid. Stas 4 Rhamnus. 130. 
— A simple perianth. Style undiv. .... 14 - 
14. Perianth of fern, fls 2-fid. Stas 4. Spiny shrubs 
Hyppophae. 498. 
— Perianth 4-partite. Stas 9 —12 . . Laurus. 496. 
15 (1). Pis consisting of small ls (fronds), floating freely on 
7 
8 
9 
10 
11 
Lemna. 535. 
. 16 
. 17 
19 
Hydrocharis. 525. 
the water 
— Pis with stem and ls 
16. Water pis (floating or submerged) 
— Land pis ..... 
17. Ls reniform. Stas 9 
— Ls linear or grass-like. Stas 1—3 . . . 18 
18. Ls opp., or in dusters of 3, spiny-toothed Naias. 534. 
— Ls all radical, finely denticulate only at the extremity 
Vallisneria. 524. 
19 (16). Stem climbing . . 20 
— Stem not climbing ...... 22 
20. Ls opp. Stigs2.Humulus. 507. 
— Ls altern. Style 3-fid. 21 
21. Pis with spirally twisted tendrils. Ls lobed. Fls greenish- 
yellow or yellowish-white . . . Bryonia. 197. 
— Tendrils 0. Ls undiv. . . . . Tamus. 578. 
22(19). Cor. gamopet., 5-fid. Ls opp. . . Valeriana. 279. 
— Cor. with several pets, or perianth with 3-^5 divisions 
23 
23. Fl.-envelope composed of cal. and cor. . . 24 
