BUTAGEJE. 383 



more or less elongated. On tins account a distinct genus lias been 

 made of this plant under the name of Banminghausenia. 



Thamnosma, consisting of small plants of North-Western America, 

 have the tetramerous flowers of the Rue ; but the stipitate 

 gynseceum 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 Tetradidis, 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 

 gynseceum are separated from each other from their base by the 

 central column represented by a single gynobasic style. 



The Fraxinellas 1 have hermaphrodite or regular flowers, represent- 

 ing on that account a distinct subseries of Dictamnea. Their 

 calyx has five subequal sepals arranged in the bud in slightly 

 imbricated prsefl oration. The corolla is formed of five alternate free 

 petals, provided with a narrow claw. They are imbricated in the 

 hud, 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. 2 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, 3 and composed 

 of a filament bearing prominent glands, 4 and of a two-celled introrse 

 anther opening longitudinally by two sublateral clefts. 3 The gynse- 

 ceum is supported by a cylindro-conical foot, the base surrounded 

 by a not very thick glandular 6 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., 4 The tapering extremity is inserted at the 

 297. — A. Jtjss., in Mem. Mus., xiii. 467, t. 18, bottom of a conical cavity at the base of the 

 fig. 12. — Lamk., Diet., ii. 277 (Dictumus) ; connective. 



Sappl., ii. 476; III., t. 311.— DC, Frodr., i. 5 Pollen "ovoid;" three folds; in water 



712. — Spach, Suit, a Buffon, ii. 323. — Endl., ovoid, with three bands and three papillae on 



Gen., n. 6021. — Pater, Organog., 98, t. 21. — each band." (H. Mohl., in Ann. Sc. Nat., 



B. H„ Gen., 287, n. 13.—Fruxinella T., Inst., ser. 2-, iii. 339.) 



430, t. 213. — GjEETN., Fruct., i. 337, t. 69. 6 As this podogyni .in thickens more on the 



2 In the pink flowers the lateral petals are of posterior side than in front, it acquires a greater 

 a different tint from the upper. size and elevation behind ; the insertion of the 



3 Ail declinate, projected sooner or later after gynseceum seems slightly excentric. 

 anthesis, towards the anterior bide of the flower. 



