216 XXiX. EUTACE^. [Citrus. 



free, over 80, of irregular length, shorter than the petals. Ovary, with style, 

 scarcely exceediiig 1 line in length. Fruit oblong, 2^in. long, IJin. diameter, 

 showing 8 obtuse ribs, the divisions of the fruit ; pulp a sharp agreeable acid. 

 Seeds oval, somewhat flattened on one side, convex on the other, 3 lines long, 2 

 lines broad ; testa white. 



Hab.: Harvey's Creek, Eussell Eiver. 



This new species of Citms is well worthy of cultivation for its fruit, which is juicy, and of 

 equal flavour with the West Indian Lime. In general appearance'this tree somewhat resembles 

 the orange, having the same angular branchlets, 



Order XXX. SIMARUBEiB. 



Flowers regular, dioecious or polygamous, more rarely hermaphrodite. Calyx 

 usually small, 8 to 5-lobed, or divided into as many distinct sepals. Petals 8 to 

 5, hypogynous or slightly perigynous, imbricate or valvate in the bud, rarely 

 wanting. Stamens either equal in number to the petals, and alternating with 

 them, or double the number ; anthers usually versatile, with 2 parallel cells 

 opening longitudinally. Disk annular, cupular, or elongated with the stamens, 

 under or round the ovary, or rarely none. GyncEcium of 3 to 5, rarely more 

 or fewer carpels, quite distinct, or more or less united into a single-lobed 

 or rarely entire ovary, with one cell to each carpel. Styles as many as carpels, 

 united from the base or by the stigmas only, or entirely distinct. Ovules 

 solitary in each cell, or very rarely 2, the micropyle superior. ITruit-carpels 

 either distinct, dry or drupaceous, usually indehiscent, or united in a single 

 drupe or capsule. Seeds usually solitary in each carpel or cell, pendulous ; 

 testa membranous ; albumen abundant, or little, or none. Embryo straight or 

 curved ; cotyledons flat or convex, rarely twisted ; radicle superior. — Shrubs or 

 trees, with a bitter bark. Indumentum of simple not stellate hairs i Leaves 

 alternate or rarely opposite, pinnate or simple, usually without glandular dots. 

 Stipules none, except in Gadellia. Flowers usually small, in axillary or rarely 

 terminal panicles or racemes. 



The Order consists of a considerable number of small genera, chiefly tropical, dispersed over 

 the New as well as the Old World. Of the 6 Australian genera, 3 belong to tropical Asia, one of 

 which extends also into Africa, 2 are endemic, and the sixth is on the seacoasts of all tropical 

 countries. The Order as a whole is somewhat heterogeneous, and especially has no peculiar 

 habit. In technical characters it is. closely allied to Rutacea;, from which it differs chiefly 

 in the bitter bark, the want of pellucid dots to the leaves, and in the solitary ovules, but each of 

 these characters has some exceptions. — Benth. 



Tkibe I. Slmarubes. — Ovary deeply divided, the carpels or lobes entirely distinct or 

 connected by the styles or stigmas. 



Leaves pinnate. 



Stamens twice as many as petals. Fruit-carpels winged and samara-like . . 1. Ailaxthcs. 



Stamens equal in number to the petals. Fruit-carpels drupaceous .... 2. Bkucea. 



Leaves simple. Fruit drupaceous, variously winged 3. Sam.ideka. 



Sepals nearly or quite as long as the petals. Styles free. 



Sepals spreading under the fruit. Leaves thin 4. Cadullia. 



Sepals connivent over the fruit. Leaves almost fleshy .... . . 5. Suriana. 



Teibe II. PlcramnieEe. — Ovary 2 to 5-celled, entire or rarely shortly lobed. 



Leaves 3-foliolate 6. Haekisonia. 



1. AILANTHUS, Desf. 



(From ailanto, Tree of Heaven.) 



Flowers polygamous. Calyx small, 5-lobed. Petals 5, valvate in the bud. 

 Disk lO-lobed. Stamens 10, fewer or none in the female flowers; filaments 

 tvithout scales. Ovary 2 to 6-lobed ; styles connate, with plumose stigmas ; 



