CLASSIFICATION OF PLANTS. XXV 
“ T have adopted this series, partly because I think it that which is least 
removed from a natural sequence, and partly because it is convenient and 
easy for study. But let no one imagine that I attach the least importance 
to it. The true science of general natural history consists in the study of 
the symmetry peculiar to each family, and of the relation which these 
families bear to each other. All the rest is merely scaffolding, better or 
worse suited to accomplish that end” (p. 206, 1st edition). 
At this time De Candolle made no attempt to combine the Natural 
Orders in Alliances; but at a later period (1819), ina second edition of the 
“Théorie,” he proposed a few such groups, under the name of Cohorts, as 
will be seen by the following lists of his Orders, taken from the edition of 
1819. In that of 1844, published by his son after his death, these Cohorts 
are all broken up, and considerable alteration is made in the sequence of 
the Natural Orders. 
I. Vascutar or Co- 
TYLEDONOUS PLANTs; 
i. e., furnished with cel- 
lular tissue and vessels, 
and whose embryo is 
provided with one or 
more cotyledons. 
1. Exogens or Dico- 
tyledons; i. e., where 
the vesselsare arranged 
in concentric layers, of 
which the youngest are 
the outermost, and 
where the embryo has 
opposite or verticillate 
cotyledons. 
A. Perianth double; 
i. e., where the calyx 
and corolla are distinct. 
THALAMIFLORE. 
Petals distinct,inserted 
on the receptacle. 
Cohort I—Carpels nu- 
merous, or stamens 
opposite the petals. 
- Ranunculacee. 
. Dilleniacee. 
. Magnoliacee. 
Anonacee. 
. Menispermer. 
. Berberide. 
7. Podophylle. 
8. Nymphezacew. 
Sok wwe 
Cohort II. — Carpels 
solitary, or consoli- 
dated, placente pa- 
rietal. 
9. Papaveracee. 
10, Fumariacee. 
11. Crucifere. 
12. Capparides. 
13. Flacourtianes. 
14. Passiflorese. 
15. Violaceze. 
16. Polygalee. 
17. Resedacee. 
Cohort III.—Ovary so- 
litary, placenta cen- 
tral. 
21. Caryophyllex. 
22. Linee. 
23. Malvacee. 
24. Chlenacex. — 
25. Byttneriacer. 
| 26. Sterculiacee. 
27. Tiliacer. | 
28. Elwocarpee. 
29. Sapindacee. 
30. Hippocastanez. 
31. Aceracee. 
32. Malpighiacer. 
33. Hippocratiacen. 
34. Hypericinex. 
35. Guttifereer. 
36. Marcgraviacer. 
37. Sarmentacez. 
38. Geraniez. 
39. Cedrelex. 
40. Meliacez. 
41. Hesperides. 
42. Camelliez. 
43. Olaciner. 
44. Rutacee. 
Cohort IV.—Fruit gy- 
nobasic. 
45. Simaroubiacex. 
46. Ochnacee. 
CALYCIFLORE. 
49. Zanthoxylex. 
50. Juglandez. 
51. Terebinthacez. 
52. Leguminose. 
3. Rosacer. 
54. Salicarie. — 
55. Tamarascines. 
56. Melastomez. 
57. Myrtinee. 
| 68, Combirataoud: : 
59. Cucurbitacew. 
