HISTORICAL. 3 
Though it is clear from this list that the characters which separate Derris from 
Dalbergia had not been fully realised, and that Roxburgh had been unable from its 
original description to recognise D. lanceolaria, it will be observed that the Hortus 
Bengalensis adds no fewer than ten distinct species to Dalbergia, a very substantial 
addition to our knowledge of the genus. 
Dennstedt, who іп 1818 published a Key to the Hortus Malabaricus,* by name 
refers to three Dalbergias; as it so happens, not one of them is a member of the 
genus, The three are Dalbergia arborea and D. heterophylla, exactly as limited by 
Willdenow; with D. lanceolaria, іп the sense, however, of Lamarck and not of Linnwus. 
The first, as already explained, is the Pongam of Adanson; the third is that suthor’s 
бою. The second, which is in reality Derris uliyinosa, is the Salken of Adanson ;* 
it is somewhat remarkable that, though the plant оп which this genus was founded 
is nowadays correctly referred to Derris, the ‘genus’ itself is, by the authors of 
the Index Kewensis and by Dr. Kuntze, by oversight referred to Dalbergia. ‘There are, 
however, two Dalbergias figured in the Hortus Malabaricus; one of them, D. torta 
(Rheede’s Karin-tagerat), is referred by Dennstedt to Cussia ; the other, which is Rheede’s 
Ana-muilu,§ Dennstedt has named Amerimnum horridum. The genus Amerimnon was 
originally ‘proposed’ for a West Indian shrub by P. Browne in 1756,| it was estab- 
lished іп Persoon’s Synopsis in 1806€, and accepted by De Candolle in 1825;** by 
most subsequent authors it has been merged in Dalbergia. There is no doubt that 
Amerimnon and Dalbergia are congenerie, and recently certain writ:rs, notably Пт, Kuntze 
and Mr. Hiern, would insist on the substitution of the name Amerimncn for the name 
Dalbergia throughout, The objections to this proposal will be dealt with in a sub- 
sequent paragraph; in the meantime, however, % may be noted in passing that Dr. 
Kuntze, usually so accurate, has overlooked the fact that Dennstedt and Blanco had 
already anticipated his views and his action, with the result that Kuntze uses the name 
Amerünnon sympathelieum for a species that nearly three quarters of a century earlier 
had been duly named A. horridum by Dennstedt. In 1821 Rothtt published as a 
new species D. arborea, Heyne (not of Willdenow), which he considered to be very 
closely related to D. lanceolaria, but to be nevertheless distinct, In the writers 
opinion, however, the differences, though marked, are rot so great as to be specific, 
tor D. lanceolaria is a somewhat variable plant, In the same place Roth published a 
description of the fruits of D. rubiginosa, which had previously been unknown. In 
1823 Blume founded, on what was really one of Rexburgh’s species of Dalbergia, 
D. tamarindifolia, a new genus—Lndespermum.tt 
In 1825 the condition of the genus was reviewed by De Candolle.§§ Only one new 
species was proposed, but this species (D. timorensis) was not really new: it is simply 
the Dalbergia lanceolaria B of Lamarck, not of Linnaeus, and the Dalbergia scandens of 
Roxburgh; it is not a Dalbergia, but a Derris. Sprengel in 1826]| issued another and 
less exhaustive review, for he only gave 14 ‘species. He readmitted D. Monetaria, which 
* Schimessel zum Hortus Indicus Malabaricus 20, ** Prodromus іі. 421 (Amerimnum), 
+ Fam. Рі. ii. 822 (1763). tt Nov. Plant. Species, 330. 
t Hort. Malabar. vi. 25, It Cat. Gew. Buitenzorg, 92. 
§ Wort. Malabar. viii. 40. §§ Prodromus ii. 416. 
|| Nat. Hist. Jamaica 238 t. 31, L 3. ll] Syst. Veg. Bi, 193. 
€ Persoon, Synops. ii. $78 (Amerimnum). 
Axx. Ror. Bor, Garp, Оласстта, Vor. X. 
