CLASSES, ORDERS, AND GENERA. 
XXV11 
33. PARONYCHIACE.ZE. Cal. of 5 leaves. Pet. resembling 
sterile filaments or scales. Fruit 1-seeded, not winged. — Her- 
baceous plants. Leaves opposite, 'with membranous stipules, 
p. 150. 
34. Scleranthus. Perianth single, urceolate, contracted at the 
mouth. Stam. upon the throat of the perianth. Fruit 
1-seeded, covered by the hardened perianth, not winged. 
— Leaves opposite, without stipules, p. 368. 
35. CHENOPODIACEjE. Perianth single, herbaceous, 5-cleft or 
5-parted. Stam. inserted into the base of the perianth. 
Fruit covered by the perianth, 1-seeded, not winged. — Sti- 
pules none. p. 358. 
36. Polygonum. Perianth single, coloured, 5-parted. Stam. in- 
serted at the base of the perianth. Achene 1-seeded, wing- 
less. — Herbaceous plants, with alternate leaves and sheathing 
stipules, p. 369. 
37. Ulmus. Perianth single, 4 — 6-cleft. Fruit longer than the 
perianth, compressed, winged all round (a samara), 1-seeded. 
— Trees, with alternate leaves and minute stipules, p. 392. 
Ord. in. Trigtnia. 3 styles. 
* Flowers superior. Cor. monopetalous, 5-lobed. 
38. Viburnum. Berry usually 1-seeded. — Leaves simple, p. 192. 
39. Sambucus. Berry 3 — 4-seeded. — Leaves pinnate, p. 192. 
** Flowers inferior. 
f Perianth double. Petals 5. 
40. Tamarix. Stigmas sessile, feathery. Caps. 1-celled, 3-valved, 
with many comose seeds, p. 149. 
41. PARONYCIIIACEyE. Fruit with one naked seed. — Leaves 
with membranous stipules. (Corrigiola and Polycarpon.) 
p. 1 50. 
42. CARYOPHYLLACEiE. Caps. 1-celled, with several naked 
seeds. — Leaves naked without stipules. (Stellaria and 
Holosteum.) p. 54. 
43. Drosera. Styles filiform. Caps. 1-celled, with several naked 
seeds — Leaves clothed with glandular hairs, p. 50. 
ff Perianth single. 
44. CHENOPODIACEiE. Perianth herbaceous. — Stipules want- 
ing. (Ciienopodium and Su^da.) p. 358. 
45. Polygonum. Perianth coloured. — Stipules sheathing, p. 369. 
Ord. IV. Tetragynia. 4 styles. 
46. Parnassia. Cal. deeply 5-cleft. Petals 5. Nectaries 5, heart- 
shaped, fringed with globular-headed filaments. Stigmas ses- 
a 2 
