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REVISION OF THE NATURAL ORDER ZZDERACEX. 
Bx BERTHOLD Seemann, Ph.D., F.L.S. 
Under this heading I propose publishing a series of papers on all 
Umbelliferous plants having valvate petals and a fruit composed of two 
or more carpels, of which Hedera Helix is the type; all genera with 
imbricate petals and 1-celled ovaries being excluded, as elements foreign 
to this group. 
Linnzus has bequeathed us only one genus of Hederacee (Hedera); his 
genera Panay and Aralia, reduced to their original limits, are not 
members of the Order. 
In 1756, P. Browne published the genus Sciadophylium ; ten years 
later (1766), Forster, Schefflera, Polyscias, and Meryta. In 1780, 
Thunberg established the genus Cussonia, and in 1789, Commerson 
that of Gastonia. In 1791, Gertner added Heptapleurum ; in 1802, 
Ruiz and Pavon, Gilibertia and Actinophyllum ; and in 1806, Petit- 
Thouars, Maralia. During the twenty-four years which followed, no 
additions were made to this list. 
-In 1830, De Candolle enumerated thirteen genera, viz. Adoxa, 
Panax, Cussonia, Maralia, Gilibertia, Gastonia, Polyscias, Toricellia, 
Aralia, Sciadophyllum, Hedera, Paratropia, and Arthrophyllum. Four 
of these (Adowa, Panax, Aralia, and Arthrophyllum) being excluded 
by the definition above given, the genera known to De Candolle are re- 
duced to nine. Only one of the genera published as new on this occa- 
sion (Zoricellia), was not previously known. 
In 1840 Endlicher, in his “Genera Plantarum ’ (including the first 
supplement), enumerated sixteen genera, adding to those known to 
De Candoll: Botryodendron, Miquelia, and Brassaia. But Miquelia 
belongs to Olacinee, so that we obtain only two additions, or rather 
one, for Botryodendron had been previously described by Forster under 
the name of Meryta, as I have shown in * Bonplandia’ for 1862, p. 294. 
In-1854 Asa Gray (Botany of Wilkes’s Expedition) added to our 
list Reynoldsia, Tetraplasandra, and Plerandra,—all three excellent 
genera. F 
In the same year (1854) Decaisne and Planchon commenced, in the 
Revue Horticole,’ a revision of the Order “ Araliacee,” which un'ortu- 
