EQUISETACEA. 699 
rarer in the southern hemisphere, and unknown in Australia, New Zealand, and the 
greater part of Polynesia, as well as Patagonia and Fuegia. The genus is also unrepre- 
sented in most oceanic islands, as Ascension, St. Helena, Tristan da Cunha, and all 
the islands in the south part of the Indian Ocean. One species has been collected in 
the Bermudas. where, however, it seems to be very rare; and #. debile ranges from 
Japan to the New Hebrides, New Caledonia, and the Fijis. Several of the species have 
a wide range, and FE. ramosissimum almost covers the area of the genus. The greatest 
concentration of species is in America, where twenty-one out of the twenty-five occur, 
and of these nine are endemic. Thirteen species inhabit America north of Mexico, 
but only one, £. levigatum, is peculiar to that region. 
1. Equisetum bogotense, H. B. K. Nov. Gen. et Sp. i. p. 42; Milde in Nov. 
Act. Nat. Cur. xxiv. 2, p. 311, t. 12, et Fil. Europ. &c. p. 226. 
Equisetum ramosissinum, Seem. Bot. Voy. ‘ Herald,’ p. 244, non H. B. K. 
Costa Rica, Cartago (Friedrichsthal) ; Panama, Chiriqui, Veraguas (Seemann, 1547). 
—Cotomsia to Guiana and Cut. Hb. Kew. 
Hartweg’s specimen of this species recorded from Jamaica, was collected near Quito, 
as is proved by the original label bearing the same number, namely 1462. 
2. Equisetum giganteum, Linn. Sp. Pl. ed. 2, p.1517; Milde in Nov. Act. Nat. 
Cur. xxiv. 2, p. 397, t. 21, et Fil. Europ. &c. p. 232. 
Equisetum ramosissimum, H. B. K. in Willd. Sp. Pl. v. p. 9, teste Milde. 
GUATEMALA, Patal, Baja Vera Paz (Bernoulli & Cario, 140).—West Inpins to Cait 
and Brazit. Hb. Kew. 
Ernst collected specimens of this species in the neighbourhood of Caracas from plants 
36 feet high, though the stems were barely 2 inch thick, being partially supported by 
other vegetation. 
3. Equisetum mexicanum, Milde in Nov. Act. Acad. Nat. Cur. xxiv. 2, p. 504, 
t. 28, non Verhandl. zool.-bot. Gesell. Wien, 1862, p. 1256. 
South Mexico, on the Rio Blanco, Orizaba (Miller, 1855), Hacienda de Mirador 
(Liebmann). 
4, Equisetum myriochetum, Ch. et Schl. in Linnea, v. p. 623; Milde in 
Nov. Act. Nat. Cur. xxiv. 2, p. 493, t. 27, et Fil. Europ. &c. p. 240; Fourn. Mex. Pl. 
Enum, i. p. 142. 
Sout Mexico, Misantla (Schiede), Cordova (Schaffner), Mirador (Linden; Bourgeau, 
2767). Hb. Kew. 
5. Equisetum ramosissimum, Desf. Fl. Atl. ii. p. 398; Milde in Nov. Act. 
Nat. Cur. xxiv. 2, p. 428, t. 24, et Fil. Europ. &c. p. 234. 
Equisetum elongatum, Willd. Sp. Pl. v. p. 8, teste Milde ; Fourn. Mex. Pl. Enum. i. p. 142. 
British CoLomsBia southward.—Souta Mexico, Eugenio, Sierra de la Cruz (Miller), 
Jicaltepec, Chinantla (Liebmann), Orizaba (Schaffner; Miller), near Jalapa (Galeotti, 
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