Rutaceae. 



ridges, as on Konahuanui, Niu Valley, and in the Koolau range, where the tree 

 is not uncommon. 



The bark, as of nearly all the other Hawaiian species of this genus, is thin 

 and smoothish, with yellowish lenticels ; in other species the bark is dark brown 

 to black and has the appearance of having been burned; the granular mass will 

 come off even when only touched, in others again the bark is covered with very 

 narrow only slightly protruding confluent ridges. The wood of this, as of the 

 other species, is yellow and bitter to the taste. 



Xanthoxylum hawaiiense Hbd. 



A'e or Hea'e. 



(Plate 77.) 



XANTHOXYLUM HAWAIIENSE Hbd. Fl. Haw. Isl. (188) 76; Del Cast. 111. PI. Ins. 

 Mar. Pacif. VI. (1890) 129. Fagara hawaiiensis Engler in Engl. et Prantl 

 Pflzfam. III. 4. (1895) 119. 



A medium sized tree, glabrous; leaves pedately 3-foliolate, on petioles of 3.5 to 4.5 

 em, the leaflets on petiolules of equal length, not articulate, but occasionally thickened 

 near the blade, acuminate, ovate to deltoid, the lateral ones unsymmetrical or subcordate, 

 5 to 7 cm long, 4.5 to 5.5 cm wide; panicles in the axils of the leaves or at the end of 

 the branches; follicles curved, almost smooth, but pitted, 1 cm in diameter. 



Hillebrand records this tree from the central plateau on the Island of Hawaii 

 at 5000 to 6000 feet elevation, evidently from between Mauna Kea, Mauna Loa 

 and Mt. Hualalai. The writer did not meet with this tree on that great plain, 

 but collected specimens of an evident variety of this species on the slopes of 

 Mauna Kea near Keaumoku, among composites such as Raillardia and Lipo- 

 chaeta, near the extinct crater of Xohonaohae at an elevation of perhaps 4000 

 feet. 



On his last visit to North Kona, Puuwaawaa, he collected flowering specimens 

 of a Xanthoxylum ; in fact, the same species as found at Nohonaohae, referrable 

 to X. hawaiiense. The specimens were collected on the laA r a fields beyond Puu- 

 anahulu joining the pahoehoe lava flow of 1859. The leaves of this tree as well 

 as those from Xohonaohae are exceedingly strong lemon scented, exactly as those 

 of Eucalyptus citriodom. which fact caused the manager of the Parker Ranch, 

 on which land the trees are found, to believe that the tree was the lemon-scented 

 gum. 



It is peculiar that Hillebrand should not have noticed such a strong aromatic 

 odor, which none of our other Xanthoxyla possess ; he, however, fails to mention 

 anything about it. The true species, answering Hillebrand's description in 

 nearly every detail, was found by the writer on the southern slopes of Mt. Hale- 

 akala, Maui, where the tree is, however, not abundant. There the trees have not 

 the slightest odor of lemon, but the ordinary, somewhat soapy smell, as have the 

 rest of our Xanthoxyla. In the latter locality the trees were in fruit during 

 Xovember, 1910, where the writer collected his first material of this species (no. 

 8657 in the College of Hawaii Herbarium). 



195 



