266 



NATDRAL HISTORY OF PLANTS'. 



small distinct subseries on account of the gamopetalous corolla. The 

 polygamous flowers are 4-6-merous, the dentate calyx and the corolla 

 being valvate, and the diplostemouous androceum (whose anthers 

 are sterile in the female flower) formed of pieces inserted outside a 

 large hypogynous disc, with lobes projecting in the intervals of the 

 stamens. The gynseceum is that of Bursera ; the ovary is voluminous, 



although sterile and full in the 



Hedwlgia {Tralt'mickia) rhnifulia. male floWCrS, whilst in the 



female it presents, opposite 

 each petal, a cell having two 

 collateral desccndent ovules 

 with superior and exterior mi- 

 cro pyle. The fruit is a drupe 

 with 1-5 hard stones, each 

 containing a seed with a thick 

 fleshy embryo, whose cotyle- 

 dons are plano-convex. The 

 four or five known species of Hedwigia are trees from tropical 

 America, having alternate or sub-opposite imparipinnate leaves, 

 with opposite folioles entire or denticulate. The numerous flowers 

 are arranged in the axil of the leaves in ramified clusters of 

 cymes. 



Under the name of Trattinickia, are distinguished generically two 

 or three other species of Hedivigia from tropical South America, 

 whose pinnate folioles are entire, coriaceous, and the flowers 

 (fig. 294, 295) trimerous ; we only preserve them here as a section. 



Fig. 294. Male flower. 



Fig. 295. Male flower 

 without the perianth. 



III. ANACAKDIUM SERIES. 



Jnacardium, fi-om which this group takes its name, is not the 

 most regular type, on account of the inequality of the parts of the 

 androceum and the iiTegularity of the gynteceum. But we can study 

 to commence with a genus with regiilar flowers, such as Schiniis ' 



' L. Oev. 11. 1130.— Mill. /coh. t. 246.- J. 

 Gai. 371.— Lamk. Did. iv. 229 ; Suppl. iii. 721 ; 

 III. t. 822.— K. in Ami. He. Nat. ser. 1. ii. 139. 

 — DC. Prodi: ii. 74. — Si'Ach. Suit, a Btiffmi, ii. 

 224.— Endl. Gen. n. 5901.— B. H. Gen. 422, n. 

 15. — Mauch. Aiittciird. 52, 1C5. — Aroeiia Pis. 

 Brns. ai.—Mr.lk Cr.UR. F..rot. 322.— T. Tnsl. 661. 



— Adans. Fam. des Fl. ii. 341. — Mnlli Feuill. 

 Per, iii. 43, t. iQ.—Diivcnm K. in Ann. So. Nat. 

 eer. 1, ii. 340.— DC. Prodr. ii. 74.— EuDL. Otn. 

 n. 5902.— March, loc. cit. 55.— B. H. 6'«(. 426, 

 n. Zf>.—Piptoeelm Tuecz. in Bull. Mosc. (1858), 

 i. 449. — Sarcotluca Tvutz. loc. cit. 474. 



