324 GEOGRAPHICAL DISTRIBUTION OF THE EQUISETACEA. 
the species, Of the twenty-one American species only eight, species 
(E. arvense, Braunit, Telmateja, pratense, sylvaticum, palustre, limo- 
sum, and, Bogotense) are “ Equiseta phaneropora ;". all the others are 
“ Equiseta cryptopora." iiu E 
Of the eleven species met with in Asia, Æ. diffusum, Don, and Z. 
robustum, A. Braun, have the most. limited. geographical range. +The 
former grows in elevated regions (Nepaul and Himalaya), the latter is 
known to A. Braun from Lahore and Pondichery. Æ. debile, Roxb. 
(E. Timorianum, Vauch., E. virgatum and Æ. laxum, Bl., E. scoparium, 
Wall, E. Huegelii, Milde), very close to E. elongatum, and a very 
polymorphous species, is met with in dry as well as wet places of the 
elevated. regions (as is also Z. elongatum) of Cashmir, the whole 
of India, and the islands, including Ceylon, Java, and Timor, as far as 
Japan, Æ. elongatum is also found in the hotter districts of Asia. Tn 
De Candolle’s herbarium I have seen specimens from the coast, of 
Malabar. In Western and Northern Asia we encounter numerous old 
acquaintances, viz. E. arvense, E. Telmateja, E. pratense, E. sylvaticum, 
E. limosum, E. hiemale, and E. elongatum ; the last-named species aT» 
however, only in the warmer parts. Six species (Æ. arvense, pratense, 
sylvaticum, limosum, hiemale, and elongatum) grow in the Altai, and 
with the exception of F. elongatum, even in the Amur country. But 
only Æ. arvense seems to extend as far east as Japan, whence I haye 
examined numerous fruiting specimens. Of the two species pecu- 
liar to Asia, E. diffusum, Don (representing our E. arvense), belongs to 
the ** Equiseta phaneropora," and Æ. debile, Roxb., to the “ Equiseta 
eryptopora."* ; 
From Africa two species (E. Telmateja and E. elongatum). are at 
present known; the former only from the north, the latter distributed 
in the north (especially as E. ramosissimum, Desf.) and in the south, 
as E. Burchellii, Vauch., and E. Thunbergii, Wickstr. ; 
Europe, with its thirteen species, does not, possess, strictly speaking 
a single one peculiar to it, Æ. littorale, Kühlew., being a hybrid, and not 
E. Telmateja does not occur in Scandinavia, E. elongatum is wanting 
in Scandinavia, Great Britain, and the north-east of Germany; and 18 
represented in England by E. érachyodon, A. Braun, a subsper 
