CLASSES, ORDERS, AND GENERA. 
xliii 
11. Humulcs. Barren fl. solitary. Perianth single, of 5 leaves. 
Stam. 5. Anthers with 2 pores at the extremity. — Fertile fl. 
in catkins, with large persistent concave entire scales. Pe- 
rianth 0. Germen superior, 1 -seeded. Styles 2. p. 391. 
12. Ribes. Perianth double. Pet. 5, inserted upon the calyx. 
Starn. 5. Germen inferior, many-seeded. Style bifid. — 
Shrubs, p. 158. 
13. Bryonia. Perianth double. Cor. 5-cleft. Stam. of 3 fila- 
ments and 5 anthers. Germen inferior, several-seeded. 
Style 3-fid. — Herbaceous plants with tendrils, p. 150. 
* * Barren and fertile flowers in catkins. Perianth 0 . 
14. Myrica. Stam. 4. Styles 2. Scales of the fertile catkin 
ultimately somewhat fleshy, and adhering to the fruit, which 
is drupaceous and 1 -seeded, p. 395. 
15. Salix. Stam. 3 — 5. Styles bifid. Scales of the ovary always 
dry or herbaceous, and free from the fruit, which contains 
many comose seeds, p. 397. 
Ord. IV. Hexandria. 6 stamens. 
16. Tamus. Perianth single, in 6 deep equal segments. Germen 
inferior. Stigmas 3. Berry 3-celled. p. 445. 
17. Rumex. Perianth single, the 3 inner ones of the fertile fl. 
afterwards enlarged, and covering the 1-seeded achene. Ger- 
men superior, p. 373. 
Ord. V. Polyandria. 8 stamens or more. 
* Flowers in catkins. 
IS. Populus. Anthers 8 — 30, arising from a turbinate, oblique, 
entire, single perianth. Caps, superior, 2-valved, with many 
comose seeds, p. 414. 
** Flowers scattered. 
1 9. Sedum. Cal. 4-partite. Pet. 4. Glands 4, emarginate. Stam. 
8. Germens 4. p. 1 55. 
20. Mercurialis. Perianth single, 3-partite. Stam. 9 — 12. An- 
thers of 2 globose lobes. Germen superior. Styles 2. Caps. 
2-celled, 2-seeded. p. 382. 
21. CARYOPII YLLACEiE. Cal. tubular and 5-toothed, or 5- 
partite. Pet. 5. Stam. 10. Germen superior, several-seeded. 
Styles 3 — A — Leaves opposite, without stipules. (Silene, 
Lychnis, Honckenya.) p. 54. 
22. ROSACEAS. Cal. 5 — 10-cleft. Pet. 5. Stam. numerous, in- 
serted on the calyx. Styles numerous. Achenes or drupes 
many, superior, seated upon an elevated receptacle. — Leaves 
alternate, with adnate stipules. (Fragaria and Rubus.) 
p. 117. 
23. HYDROCHARIDACEA5. Flowers spathaceous. Perianth 
