220 SYSTEMATIC BOTANY. 



ornamental purposes, and often seen in cultivation. Species 

 of Vitis, from Java and Sumatra, are to be seen in conser- 

 vatories. 



1 6. Burseraceae. The Myrrh family. Trees and 

 shrubs, with resinous or oily secretion. Species one hun- 

 dred and forty-five, mostly tropical. Several important 

 dyes are furnished by members of this group. Myrrh 

 is yielded by two small Arabian trees, Bakamodendron 

 Myrrha and B.Katif. Bdellium is produced by an African 

 species, Bd. Africanum. Olibanum is from Boswellia thuri- 

 Jera, a tree of Central India. Gum Elemi is obtained 

 from several trees of the West Indies and South America 

 {Amyris Elaphrium, etc). A species of Guiana {Idea alti- 

 sonidy attains a height of one hundred feet and a diameter 

 of four or five feet, and produces a wood that is light, and 

 much used in making household furniture. 



17. Rutacese, The Rue family is a group of about 

 six hundred and fifty shrubs and trees (rarely herbs), found 

 in tropical and temperate regions. Leaves with pellucid 

 glands, containing a pungent or bitter-aromatic acrid oil. 

 The common Hue (Buta graveolens) was cultivated by the 

 ancients on account of its reputed medicinal qualities, and 

 is still found in gardens cultivated as a domestic medicine. 

 It is a native of Southern Europe and Western Asia. A 

 number of valuable fruits are furnished by the genus 

 (Xtrus, as the Sweet Orange (C aurantium, native of 

 India), the Lemon (C. limonum, went from Northern 

 India to Europe during the Crusades), the Citron (C. 

 medico), the Lime (C. Limetta), the Shaddock (C. decu- 

 mana), the Seville, or Bitter Orange (C. Bigardia), etc. 

 The wood of the Orange is hard, and used for inlaying. 

 The medicinal Angustura Bark is from Oalipea cusparia, 



