TS | 
UTITUR TESTEN - ON 
VIOLA ARENARIA AS A BRITISH PLANT. 825 
characteristic of the west of Germany, and here and there found in 
the north: E. pratense and E. hiemale ave peculiar to the north, and 
occur in the south only in high woods; the same may be said of 
E. variegatum and E. scirpoides, Michx., the latter especially in Scan- 
dinavia.. 
Of all Equiseta, Z. elongatum, Willd., enjoys the most extensive dis- 
tribution; being spread from lat. 51° N. (Breslau) as far as lat. 33° 
8. (Valparaiso). 
"The principal results of this inquiry may thus be summed up :— 
“1. At present only twenty-six speciesof Zguisefim can be distinguished 
With certainty, viz. ten ** Equiseta phaneropora " (E. arvense, Liun., E. 
Braunii, Milde, E. Telmateja, Ehr., .E. pratense, Ehr., E. sylvaticum, 
Linn., Z. diffusum, Don, E. Bogotense, Humb. et Bonpl., F. palustre, 
Lim., E. limosum, Linn., and E. littorale, Kühlew.), and sixteen 
“ Equiseta cryptopora” (E. Martii, Milde, E. zylochetum, Metten., Z. 
Brasiliense, Milde, E. Schaffneri, Milde, E. giganteum, Linn., E. myrio- 
chetum, Schlecht. et Cham., Z. debile, Roxb., E. Mexicanum, Milde, 
E. elongatum, Willd., E. robustum, A. Braun, F. levigatum, A. Braun, 
E. hiemale, Linn., E. Schleicheri, Milde, E. trachyodon, A. Braun, 
E. variegatum, Schleich., and E. scirpoides, Michx. ; 
- 9. Of all the continents, America contains the greatest number of 
Species, and the most peculiar. ; 
TW Europe contains thirteen species, amongst them two subspecies 
peculiar to it, and one hybrid. : 
- 4. Asia contains eleven species, two of which are peculiar to 1t. 
5. From Africa only two European species are known. 
- 6. From Australia no species is known to us. 
ji It would, therefore, be highly interesting to be better acquainted 
With the Zguisetacee discovered by Dr. Seemann in the Viti Islands. 
x 2 : « indicated an Equisetum 
sj brote dnb qa ra Mtn BE vl 1 EIN The 
itian species isa much-branched one, growing on the banks of rivers, and will be 
figured in the ‘ Flora Vitiensis.—Eb. 
O sapogsuye gB 27 
\ VIOLA ARENARIA, De Cand., AS A BRITISH PLANT. 
.. At the desire of the Messrs. Backhouse, of York, Ihave drawn up the 
following statement. For several years past, Messrs. 
James Backhouse, 
