RUTACEÆ. 
383 
more or less elongated. On this account a distinct genus has been 
made of this plant under the name of Banninghausenia. 
Thamnosma, consisting of small plants of North-Western America, 
have the tetramerous flowers of the Rue; but the stipitate 
gynæceum is reduced to two carpels united to a much greater 
distance at their internal angle, so as to form almost one two-celled 
ovary. 
In Zetradiclis, consisting of fleshy, many-stemmed herbs from the 
East, the flower is also tetramerous; but the androceum is isoste- 
monous, and the four sub-independent ovaries constituting the 
gynæceum are separated from each other from their base by the 
central column represented by a single gynobasic style. 
The Fraxinellas' have hermaphrodite or regular flowers, represent- 
ing on that account a distinct subseries of Dictamnee. Their 
calyx has five subequal sepals arranged in the bud in slightly 
imbricated præfloration. The corolla is formed of five alternate free 
petals, provided with a narrow claw. They are imbricated in the 
bud, so that the anterior covers the two lateral. These, in their 
turn, envelope the two posterior, one of which is covered on both 
edges. At anthesis the four posterior petals, almost alike, are pro- 
jected from the side of the axis, and the anterior petal on the side of 
the axile bract.? The corolla thus appears bilabiate. Quite against 
the petals the stamens are inserted, superposed five to the sepals, 
and five, rather shorter, to the petals. They are free,’ and composed 
of a filament bearing prominent glands,‘ and of a two-celled introrse 
anther opening longitudinally by two sublateral clefts. The gynæ- 
ceum is supported by a cylindro-conical foot, the base surrounded 
by a not very thick glandular* disk, upon the edges of which are 
articulated the staminal filaments. Upon the summit of the recep- 
tacle five oppositipetalous carpels are inserted. ‘The ovaries are inde- 

1 Dictamnus L., Gen. n. 522.—J., Gen. 
297.—A. Juss., in Mém. Mus., xiii. 467, t. 18, 
fig. 12.—LamK., Dict., ii. 277 (Dictamus) ; 
Suppl., ii. 476; JU, t. 344.—DC., Prodr., i. 
712.—Spacu, Suit. à Buffon, ii, 323.—Env1., 
Gen., n. 6024.—PavER, Organog., 98, t. 21.— 
B. H., Gen., 287, n. 13.—Fraxinella T., Inst., 
4 The tapering extremity is inserted at the 
bottom of a conical cavity at the base of the 
connective. 
5 Pollen “ovoid;” three folds; in water 
ovoid, with three bands and three papillæ on 
each band.” (H. Mout., in Ann, Sc. Nat. 
sér. 2, iii, 339.) 
430, t. 248.—Garvn., Fruct., i. 337, t. 69. 
? In the pink flowers the lateral petals are of 
a different tint from the upper. 
# All declinate, projected sooner or later after 
anthesis, towards the anterior side of the flower. 
5 As this podogyniim thickens more on the 
posterior side than in front, it acquires a greater 
size and elevation behind; the insertion of the 
gynæceum seems slightly excentric. 
