THAIAMIFLOE^. 



485 



Lansw7n.— This ia a genus of plants inhabiting the East Indian Archi- 

 pelago. They jrield fruits which are much esteemed, and known under the 

 names of Langsat, Lanseh, Ayer-Ayer, or Bejetlan. 



Melia Azadirachta.—The root-bark of this tree is used in the United 

 States of America as an anthelmintic. The fresh bark is the most active. 



Milnea edulis produces an agreeable fruit. 



Xylocarjjus Gi-anaium.—Th.e bark possesses astringent and tonic properties, 

 and is emploj'ed as a remedy by the Malays, in diarrhoea, cliolera, 6ic. 



Natural Order 50. AuEANTiACEiE. — The Orange Order (fys. 

 900 — 902).— Character. — Trees ov shruK^. Leaves alternate, 

 exstipulate, dotted, and with the blade articulated to the petiole 

 {fig. 29-i), which latter is usually winged. Flowers regular, 

 fragrant. Calyx short {fig. 902), urn-shaped or campantdate, 

 3— 5-toothed {figs. 900 and 902), withering. Petals equal in 



Fig. 900. 



Fig. 901. 



Fig. 902. 



Fig.^W. Diagram of the flower of the Orange (Citrus Aurantium) 



Fig. 901. Vertical section of tlie pistil, sliowing a portion of tlie disic at 



its base, and a solitary bypogyuous staraeu. Fig. 902. Pistil of the 



Orange, with disk at its base, and the calyx : the petals and stamens 

 have been removed. 



number to the divisions of the calyx {fig. 900), distinct or 

 slightly coherent at the base, imbricate, inserted on a hypogy- 

 nous disk. Stamens equal in number to the petals, or some 

 multiple of them {fig. 900) ; filaments flattened at the base, either 

 distinct, or coherent into one or several bundles {figs. 539 and 

 900) ; inserted along with the petals on the disk. Bisk hypo- 

 gynous, anmdar {figs. 901 and 902). Ovary many-celled {fig. 

 900); style 1 {figs. 901 and 902); stigma ^rA:A.vgt^ {fig . 902), 

 and slightly divided ; ovules solitary or numerous. Fruit inde- 

 hiscent, constituting what has been termed an hesperidium {fig. 

 698), 1 or many-celled ; -placentas axile {figs. 698 and 901). Seeds 

 solitary' or numerous ; sometimes containing more than one em- 

 bryo ; the raphe and chalaza generally very evident, exalbximi- 

 nous ; embryo straight, with thick fleshy cotyledons, and a short 

 radicle next the hilum. 



Diagnosis. — Trees or shrubs with alternate dotted exstipulate 



