Bowlesia[9] (Drusa oppositifolia, DC.), Clethra, five species of Bystropogon, and Cedronella. Of these Bowlesia is otherwise confined to the tropical Andes of America, one species only extending as far north as Mexico; the Canarian species, which according to Webb is found on rocky shaded places in Teneriffe, from the sea-level to the wooded region, is most closely allied to a Peruvian one. Clethra is a genus which extends from South Brazil to the Northern United States, and is also found in Japan and the Malayan Archipelago. The Macaronesian species most resembles a North American; it is found also in Madeira. Bystropogon is, like Bowlesia, an Andean genus, extending from Peru to Columbia. All the Canarian species belong to a different section from the Andean, and there is one species of the same section in Madeira. Cedronella is a North American and Mexican genus, and the Canarian species differs from all its congeners in its trisect leaves; it is also Madeiran.
Of the Canarian Laurineæ, Persea indica, also a native of Madeira and the Azores, belongs to an American section of that large genus.
c. Tropical and South African types in the Canaries. Of these the most noticeable are two forest trees, belonging to the large tropical genus Myrsine. One of these, M. excelsa (Heberdenia excelsa, Banks) is also found in Madeira; the other, M. canariensis, is confined to the island whose name it bears. The tropical order Sapotaceæ, to which Argania belongs, has no representative in the Canaries, but has one in the Sideroxylon Mermulana of Madeira.
The only almost exclusively South African genus[10] in the Canaries is a species of Lyperia, of which there are numerous Cape of Good Hope species, and one doubtful one in the Somali country (North-East Africa). The widely diffused Cape shrub, Myrsine africana, is found in the Azores and in Abyssinia, but not in the Canaries, Cape de Verdes, Madeira, or Marocco. The two singular shrubs Phyllis and Plocama, consisting each of a single species, of which the Phyllis is found also in Madeira, are representatives of the Anthospermeæ, a very large and conspicuously South African and Australian tribe of Rubiaceæ, and of which the only Maroccan representative is Putoria, a Mediterranean genus of a single species, and which is not Canarian.
The Oreodaphne fœtens of the Canaries and Maderia is now[11] referred to the American, Madagascar, and South African genus Ocotea, and is most nearly allied to a species found in the latter country.
The Maroccan flowering plants are thus grouped by Ball in his ‘Spicilegium Maroccanum’[12]:—
| Total number of Maroccan species | 1.627 |
| Species widely diffused, temperate or tropical | 467 |
| Of which there are common to Marocco and the Islands | 300 |
| Maroccan, but not Insular | 167 |
| Mediterranean species in Marocco | 995 |
| Of which there are widely spread species common to the Islands and Marocco | 254 |
| Confined to Marocco and the Islands | 15 |
| Mediterranean species in Marocco, but not in the Islands | 726 |
| Maroccan species exclusively | 165 |
The proportion of Monocotyledons to Dicotyledons is in Marocco 1 to 4·6, in the Canaries 1 to 6—a very great difference.
The leading natural orders in Marocco and the Canaries respectively are:—
| Marocco Species | Canaries Species | |
|---|---|---|
| Compositæ | 208 | 143 |
| Leguminosæ | 189 | 104 |
| Gramineæ | 134 | 77 |
| Umbelliferæ | 86 | 27 |
| Labiatæ | 81 | 59 |
| Cruciferæ | 73 | 29 |
| Caryophylleæ | 69 | 38 |