MYRICACEA. 165 
(The Casuarina& are a small Order of one genus and twenty-three arboreous and 
shrubby species, most of which inhabit Australia and New Caledonia; four occur in 
the Malayan Archipelago, one of which has also a wide range in Tropical Asia, the 
Mascarene and Pacific Islands. | 
Order CXXXI. CUPULIFER. 
Cupulifere, Benth. et Hook. Gen. Plant. i. p. 402. 
Ten genera and about 400 arboreous and shrubby species, generally dispersed in the 
temperate regions of the northern hemisphere, and extending into the tropics as well 
as into the arctic regions; one genus only, Fagus, in the temperate and frigid regions 
of the southern hemisphere. 
Tribe I. BETULA. 
Betule, Benth. et Hook. Gen. Pant. iii. p. 403. 
This tribe comprises two genera and about forty species. 
| 1. ALNUS. 
Alnus, Geertn. Fruct. ii. p. 54, t. 90; Benth. et Hook. Gen. Plant. i. p. 404. 
About fourteen species, widely spread in Europe, Central and Northern Asia, North 
America, and the Andes of South America; one of the European species also occurs in 
South Africa, where, however, it was accidentally introduced. 
1. Alnus acuminata, H. B. K. Nov. Gen. et Sp. ii. p. 20; DC. Prodr. xvi. 2, 
p. 188. 
«. genuina, Regel in DC. Prodr. xvi. 2, p. 184; Mirbel in Mém. Mus. d’Hist. 
Nat. Par. xiv. t. 22. 
Betula arguta, Schl. in Linnea, vii. p. 139. 
Alnus arguta, Spach in Ann. Sc. Nat. série 2, xv. p. 205. 
South Mexico, Orizaba, 7000 to 10,000 feet (Linden, 1040; Liebmann), near San 
Miguel del Soldado, Naulingo, Acatlan, and Chiconquiaco (Schiede).—Prru. Hb. Kew. 
@. mirbelii, Regel, loc. cit. 
Alnus jorullensis, Benth. Pl. Hartw. p. 52, non H. B. K. 
Sourn Mexico, near Zacualtipan (Hartweg).—Prru; Boutvia. Hb. Kew. 
6. ferruginea, Regel, Monogr. p. 90, et in DC. Prodr. xvi. 2, p. 184; H. B. K. 
Nov. Gen. et Sp. ii. p. 21 (species). 
Alnus rufescens, Liebm. MSS. 
Sour Mexico, Cerro de San Felipe (Liebmann); GuatTeMALa (Tirckheim); Panama, 
Boquete (Seemann).—Cotomsta to Bontvia. Hb. Kew. 
