140 NATURAL HISTORY OF PLANTS. 
The flower of Cryptosepalum tetraphyllum has but one petal, and 
that posterior, as in Sindora ; but the calyx is at the same time so 
much reduced that the lateral bractlets fulfil its part in protecting 
the bud, and by their close approximation form a sac which at first 
completely covers it. Thus Cryptosepalum is in this respect to 
Copaiferee what Didelotia is to Amherstiee. The sepals are repre- 
sented by four little scales; there are three stamens with short 
free filaments and versatile introrse two-celled anthers; and the 
gyneceum resembles that of Copaifera or Detarium. As yet we do 
not know the fruit of this unarmed branching tree from the west of 
tropical Africa. Its leaves are paripinnate, with one or two pairs of 
coriaceous leaflets, and little lateral stipules. Its flowers form short 
axillary racemes, whose caducous bracts fall off and leave the bract- 
lets persisting on either side of each flower. While Cryptosepalum 
links the most imperfect Amherstiee to Copaiferee by its affinities 
with Didelotia, Zuccagnia, formerly placed in this series, links it, as 
will be now seen, to those Cesalpiniee in which the structure of the 
flower is least intricate. 
VIII. DIMORPHANDRA SERIES. 
Dimorphandra’ (figs. 131, 1382) has regular hermaphrodite flowers ; 
Dimorphandra speciosa. 
Fie. 131. Fia. 182. 
Flower (4). Longitudinal section of flower. 
the very narrow receptacle bears a gamosepalous calyx, a poly- 
1 Benru., Gen., 584, 1003, n. 360; in Trans. maraviense Oxrv., and C.? mimosoides WELw.] 
Linn, Soc., xxv. 315, t. 43 B.— Cynometra ? ? Scnorr, ap. Sprene., Syst. Cur. Post., 
tetraphylla Hoox. F., Niger, 329.—Watr., 404.—EnpL., Gen. n. 6824.—B. H., Gen., 587, 
Amn, ii. 449, n. 2.—Oxrv., Fl. Trop. Afr. ii, n.370—Mora Scuoms., ex BENTH., in Trans, 
303. [This author adds two new species, C. Linn. Soc., xviii. 207, t. 16, 17. 
