Rutaceae. 



Haleakala the writer met with trees of this species in the forests above Makawao, 

 but there the leaves were all five-foliolate, membraneous, and quite glabrous. This 

 latter tree Hillebrand refers to his var. ft. of the same species, though erroneously, 

 in the writer's opinion. The Auahi specimens were collected in November, 1910 

 fruiting, no. 8658 in the College of Hawaii Herbarium. On his last visit to 

 Auahi the writer photographed one of these trees, which is figured in this book. 

 (See plate 78.) 



Hillebrand 's var. ft. is five-foliolate and strongly pubescent underneath. The 

 leaflets are, however, not smaller than in the species, at least in certain trees, for 

 this variety seems to be quite a variable one. The true variety ft. the writer col- 

 lected at Puuwaawaa, lava fields of North Kona, fruiting (no. 3651), on June 

 17, 1909. On his last visit, March, 1912, he collected the variety again, but found 

 numerous trees on the Puuwaawaa hill proper, which differed somewhat from 

 those found on the plain below, in having much larger leaves and quite pubescent 

 follicles; the leaflets are broadly ovate to ovate-acute, w r hile those of the plain 

 below are smaller of typical A', kauaiense shape, and have glabrous follicles. The 

 leaf-branch and trunk figured is the true var. ft. Hillebrand 's material came 

 from Kawaihaeiuka, a neighboring district. In that latter locality tree growth 

 has disappeared to a certain extent, owing to cattle ranches; only the most 

 hardy trees have survived. 



Hillebrand 's variety y, with rather large leaflets, comes from Kauai from the 

 forests above Waimea, meaning either Halemanu or Kaholuamano. The va- 

 riety is represented in the College of Hawaii Herbarium by the number 5960 col- 

 lected in the type locality, flowering Sept. 6, 1909. 



In order to have this monograph on the genus Xanthoxylum complete, the 

 writer wishes to describe a new species belonging to this genus. The same is, 

 however, only a shrub three feet or even less high and occurs in the rain forests 

 of the Kohala Mts. at an elevation of 4100 feet. It may be described as follows: 



Xanthoxylum Bluettianum Rock sp. nov. 



A sparingly branching shrub 1 m high, glabrous; leaves three-foliolate on petioles 

 of 5 to 6.5 cm, leaflets ovate, acute, with a cuneate base, the lateral ones unevensided 5.5 

 to 8.5 cm x 3 to 5.5 cm, thick coriaceous opaque puberulous underneath, the petiolule of 

 the terminal leaflet often articulate near the blade 2.5 to 3.5 cm, those of the lateral 

 leaflets 16 to 20 mm; panicles at the base of the branchlets 8 to 12 cm long with a gray 

 pubescent compressed peduncle of 5 cm. Flowers unknown. Follicles 1 cm, pitted 

 striately rugose, curved; seeds 16 mm, the woody testa rugose under the black shining 

 epidermis. 



Hawaii : High mountains of Kohala at the edge of Honokanenui gulch at an 

 elevation of 4100 feet, in company with Schiedea diffusa (fruiting June, 1910, 

 Rock n. 8373, type in College of Hawaii Herbarium). 



Named in honor of Mr. P. W. P. Bluett, Manager of Kohala Ditch, through 

 whose kindly aid the exploration of Kohala was made possible. 



201 



