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2 suspended ovules in each cell ; style simple; stigma lobed. Fruit drupaceous, with 5 or 

 fewer cells. Seed with a membranous integument ; embryo straight, oblong, lying in fleshy 

 albumen; radicle superior. — Trees or shrubs. Leaves alternate, simple, coriaceous, without 

 stipulse. Flowers somewhat cymose. 



Affinities. These are not well made out : they differ from Meliacese very 

 much inhabit, and in many respects in fructification, especially in having 1 the 

 aestivation of the corolla quincuncial, not valvate, and the stamens sometimes 

 indefinite • the anthers also of Humiriacere. as Yon Martius observes, ( Nov. 

 Gen. fyc. 2. 147.,) are very different from Meliaceaj in the great dilatation of 

 their connectivum ; their albuminous seeds and slender embryo are at variance 

 with Meliacese. In the latter respect, and in their balsamic wood, they agree 

 better with Styracinere, as also in the variable direction of the embryo. Besides 

 these points of affinity, Von Martius compares Humiriacea? with Chlenacea?, 

 on account of both orders containing definite and indefinite monadelphous sta- 

 mens, several stigmas, partially abortive cells, inverted albuminous seeds, and 

 a singular complicated vernation, by which two longitudinal lines are impressed 

 iipon each leaf. To me it appears, that the real affinity is with Aurantiacere ; 

 an affinity indicated by their inflorescence, the texture of their stamens, then- 

 disk, their winged petioles, and their balsamic juices. 



Geography. All Brazilian trees. 



Properties. Humirium floribundum, when the trunk is wounded, yields 

 a fragrant liquid yellow balsam, called Balsam of Umiri, resembling the pro- 

 perties of Copaivi and Balsam of Peru. JWartius. 



Examples. Humirium. 



CVIU. AURANTIACE.E. The Orange Tribe. 



AuEAN-TiACEiE, Corr. Ann. Mus. 6. 376. (1805) ; Mirb. Bull. Philom. 379. (1813) ; Dec. Prodr. 



1. 535. (1824.) 



Diagnosis. Polypetalous dicotyledons, with definite hypogynous stamens, 

 concrete carpella, an entire ovarium of several cells, an open calyx, symmetri- 

 cal flowers, definite pendulous ovules, a single style, a pulpy fruit without a 

 woody axis, exalbuminous seeds, and compound dotted leaves. 



Anomalies. 



Essential Character. — Calyx urceolate or campanulate, somewhat adhering to the disk, 

 short, 3- or 5-toothed, withering. Petals 3 to 5, broad at the base, sometimes distinct, some- 

 times slightly combined, inserted upon the outside of a hypogynous disk, slightly imbricated 

 at the edges. Stamens equal in number to the petals, or twice as many, or some multiple 

 of their number, inserted upon a hypogynous disk ; filaments flattened at the base, sometimes 

 distinct, sometimes combined in one or several parcels ; anthers terminal, innate. Ovarium 

 many-celled ; style 1, taper; stigma slightly divided, thickish ; Fruit pulpy, many-celled, with 

 a leathery rind replete with receptacles of volatile oil, and sometimes separate from the cells ; 

 cells often filled with pulp. Seeds attached to the axis, sometimes numerous, sometimes soli- 

 tary, usually pendulous, occasionally containing more embryos than one ; raphe and chalaza 

 usually very distinctly marked; embryo straight ; cotyledons thick, fleshy ; plumula conspicu- 

 ous. — Trees or shrubs, almost always smooth, and filled every where with little transparent re- 

 ceptacles of volatile oil. Leaves alternate, oftenicompound, always articulated with the petiole, 

 which is frequently winged. Spines, if present, axillary. 



Affinities. Readily known by the abundance of oily receptacles which 

 are dispersed over all parts of them, by their deciduous petals, and compound 

 leaves with a winged petiole. They are nearly related to Amyriderc and Con- 

 naraceffi on the one hand, and to various genera of Diosmes on the other, but 

 are distinguished from them all by a variety of obvious characters. The raphe 



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