506 Willis. — Endemic Genera of 
Gen . on 
Gen. in 
Gen. on 
Gen. in 
Islands. 
the World. 
Islands. 
the World. 
I. 
Rubiaceae (5) 
124 
5°6 
21. Icacinaceae 
18 
63 
2. 
Orchidaceae (2) 
120 
666 
22. Flacourtiaceae 
.17 
104 
3- 
Palmaceae 
86 
216 
23. Menispermaceae 
17 
96 
4- 
Compositae (1) 
81 
GI43 
24. Zingiberaceae 
17 
60 
5- 
Euphorbiaceae (7) 
65 
326 
25. Bignoniaceae 
16 
119 
6 . 
Leguminosae (3) 
56 
645 
26. Liliaceae 
16 
2 54 
7- 
Asclepiadaceae (6) 
47 
347 
27. Myrtaceae 
15 
90 
8. 
Acanthaceae (10) 
45 
266 
28. Verbenaceae 
15 
89 
9 - 
Gramineae (4) 
43 
506 
29. Monimiaceae 
14 
34 
10. 
Melastomaceae 
36 
186 
30. Umbelliferae (8) 
14 
325 
7°3 
4,807 
I 59 
G 2 34 
11. 
Sapindaceae 
34 
156 
31. Urticaceae 
H 
50 
12. 
Araliaceae 
33 
81 
32. Labiatae 
13 
J 97 
13- 
Apocynaceae 
29 
198 
33. Meliaceae 
13 
68 
14. 
Rutaceae 
22 
I 44 
34. Ericaceae 
12, 
119 
15. 
Saxifragaceae 
22 
96 
35. Guttiferae 
12 
54 
16. 
Araceae 
21 
131 
36. Myrsinaceae 
12 
4i 
17. 
Sapotaceae 
21 
81 
37. Boraginaceae 
11 
1 14 
18. 
Anonaceae 
20 
108 
38. Campanulaceae 
if 
73 
*9- 
Scrophulariaceae 
20 
241 
39. Cruciferae (9) 
ii 
289 
20. 
Gesneriaceae 
19 
120 
40. Cunoniaceae 
11 
30 
241: 
G356 
120 
1,035 
The first ten in the world in order of size are marked in brackets after the name. 
These first 40 families, in order of number of endemic genera upon 
islands, include 31 of the first 40 families in the world in order of size. 
The 9 others included are Campanulaceae (forty-third in the world), 
Meliaceae (forty-seventh), Icacinaceae (fiftieth), Zingiberaceae (fifty-second), 
Guttiferae (fifty-ninth), Urticaceae (sixty-second), Myrsinaceae (sixty- 
eighth), Monimiaceae (seventy-eighth), and Cunoniaceae^ (eighty-fifth). The 
corresponding nine in the world list that are missing are (in order of size) 
Rosaceae (eighteenth), Cucurbitaceae (twenty-fifth), Cyperaceae (twenty- 
seventh), Solanaceae (thirty-first), Amaryllidaceae (thirty-second), Caryo- 
phyllaceae (thirty-third), Chenopodiaceae (thirty-sixth), Anacardiaceae 
(thirty-seventh), and Gentianaceae (thirty-eighth), practically all herbaceous 
or shrubby families. 
These first 40 families include 1,223 out of 1,582 endemic genera of 
islands, or 77 per cent, of the total, the remaining 23 per cent, being com- 
prised in the other no (of the 252 remaining) families in the world which 
possess endemic genera upon islands. These families are : 
With 11 genera endemic upon islands, Tiliaceae ; with 10, Celastraceae, 
Malvaceae, Moraceae ; with 9, Anacardiaceae, Lauraceae, Thymelaeaceae ; 
with 8, Chlaenaceae, Coniferae, Loranthaceae, Proteaceae, Rhizophoraceae, 
Rosaceae, Solanaceae, Sterculiaceae ; with 7, Cucurbitaceae, Loganiaceae, 
Rhamnaceae, Simarubaceae ; with 6, Caryophyllaceae, Dipterocarpaceae, 
Gentianaceae, Hamamelidaceae, Olacaceae, Theaceae ; with 5, Bombacaceae, 
Burseraceae, Burmanniaceae, Convolvulaceae, Cornaceae, Elaeocarpaceae, 
