Legiiminosae. 



dalwood or Adcuaiitluva pavonina, a tree introduced into tlie islands from 

 India. Tlie wood of other species is manufactured into corks. 



The WilitriU is not peculiar to Hawaii, but is distributed from Hawaii to 

 Tahiti and New Caledonia. 



EnjtJn-hia indica Lam. is a cosmopolitan species of the South Seas, being- 

 found in Samoa, New Guinea, Solomon and Marshall Islands, and also has 

 found its way even into North Australia. Its vernacular names are Malatum 

 of the Tami Islands, Gatae in Samoa, where the natives have even a name for 

 the flowers, which they call alo 'alo. The bark is used as a remedy for colic, etc. 



rutace:ae:. 



The family Rutaceae belongs to the warmer regions of the globe, and wherever 

 they appear form a distinct part, or contribute to the vegetative character of 

 that partieular region. This is especially true in the Hawaiian Islands, where 

 the family is one of the most prominent features of the Hawaiian forest. The 

 group of Xanthoxyleae-Evodiinae, to which our Hawaiian Rutaceae belong, finds 

 its best development on the islands and on the western coast of the Pacific Ocean. 

 The family is represented in the Hawaiian Islands by three genera, one of 

 which, Plat>desma, is endemic, while Pelea is found in New Caledonia and 

 iladagascar. It has in these islands the hirgest number of species. The whole 

 family consists of 111 genera with over 900 species. The group Aurantieae 

 possesses the most useful members, namely, the fruit trees, such as oranges, cit- 

 rons, etc. 



KEY TO GENERA. 



Leaves compound, alternate; flowers unisexual 1 Xanthoxylum 



Leaves simple, opposite or whorled. 



Stamens free ; petals valvate 2 Pelea 



Stamens united; petals imbricate 3 Platydesma 



XANTHOXYLUM L. 



Flowers polygamous or unisexual. Calyx lobes 1 to .5, small, more or less united. 

 Petals 2 to 10, imbricate or valvate. Stamens 3 to 5, hypogynous, alternate with tlie 

 jjetals, rudimentary or wanting in tlie pistillate flowers; filaments filiform or subulate; 

 anthers elliptic to nearly orbicular or ovate. Pistils 1 to .5, raised on a fleshy gynophore, 

 sometimes slightly united below, rudimentary in the staminate flowers. Ovaries 1-ceUed; 

 styles short and slender, more or less united toward the summit; stigmas capitate; ovules 

 2 in each cavity, collateral, pendulous from the inner angle of the cell. Follicles 1 to 5; 

 endocarp free. Seeds oblong, ovoid, or globose, suspended on a slender funiculus often 

 hanging from the carpel at maturity; seed-coat black or reddish, shining. Embryo 

 straight or curved. Cotyledons oval or obicular foliaceous, — Trees or shrubs, often prickly, 

 but unarmed in tlie Hawaiian species, with acid aromatic bark, alternate equally or 

 odd pinnate or three-foliolate leaves, rarely unifoliolate, dotted with pellucid oil glands. 

 Infloresence terminal or axillary, cymose, paniculate, racemose or glomerate. Type 

 species X<iiitlii>.ri/liiiii ('Jtirn-IlercuJis L. 



The genus Xanthox>lum, or Zanthoxylum as it may also be written, consists 

 of numerous species, which were all except nine placed in the genus Pagara by 

 Engler in the Natiirliehen Pfianzenfamilien, The writer, however, adheres 

 rather to the old classification, as the distinctions on which Engler based his new 



192 



