Rutaceae. 



riety p. Hbd. with 7 to 5 leaflets, large, oblong, caudata-acuminate, rounded at 



the base and dotted as before, occurs in the woods of Hilo, on the Island of 



Hawaii. The writer is not acquainted with this variety. 



Xanthoxylum Kauaiense Gray. 



A'e or Hea'e. 



(Plates 78, 79.) 



XANTHOXYLUM KAUAIENSE Gray Bot. U. S. E. B. (1854) 354;— H. Mann in Proc. 



Bost. Soc. Nat. Hist. X. (1866) 318; et Proc. Am. Acad. VII. (1867) 160, et Fl. 



Haw. Isl. Proc. Ess. Inst. (1869) 170;— Wawra in Flora (1873) 139;— Hbd. FI. 



Haw. Isl. (1888) 73;— Del Cast. 111. PI. Ins. Mar. Pac. VI. (1890) 130.— Fagara 



kauaiensis Engler in Engl, et Prantl Pflzfam. III. 4. (1895) 119. 

 A small graceful tree, about 6 to 12 m high, with a straight trunlc and a dense round 

 crown; leaves 5 or 3-foliolate (in the trees of East Maui, southern slopes of Mt. Hale- 

 akala) on petioles of 2.5 to 3.5 cm; the leaflets ovate or oblong, 4 to 6 cm long, 2 to 3 

 em wide, subaeuminate, coriaceous and quite opaque, or with a few transparent dots along 

 the margin, glabrous, the petiolule of the terminal one occasionally but not always articu- 

 late near the blade, 12 to 16 mm, those of the lateral ones 2 to 3 mm; panicles 1 to 4 

 near the base of the short branchlets 3.5 to 7 em long, the compressed peduncle 12 to 20 

 mm, the pedicels 2 to 4 mm, the bractlets minute; flowers tetramerous, 0.5 mm, acute, 

 petals 3 to 4 mm, stamens in the male flowers longer than the petals, (in sterile flowers 

 according to Hillebrand 2 mm long) anthers ovoid, wanting in the fertile flowers; 

 carpel single, with a globose subsessile stigma, rudimentary in the sterile flowers; follicle 

 on a stipe of 4 mm, (teste Hillebr.) obovate, glabrous, faintly pitted and striate; seed 

 solitary, 8 to 10 mm. 



The Kauai A'e is a rather handsome tree with a beautiful round crown when 

 growing in the open. It occurs most frequently at Kaholuamano, as well as 

 at Halemanu, on the leeward side of Kauai, at an elevation of 3600 to 4000 feet, 

 at the outskirts of the forest, which at this elevation is more of a dry nature and 

 of a mixed type. It is quite common along stream beds in company with various 

 species of Pelea, Xanthoxylum dipetalum var. y, Alphitonia excelsa, Cyanea lep- 

 tostegia, Cryptocaria Mannii, Bobea Mannii, and Tetraplasandra Waimeae. 



The leaves of the Kauai trees of this species are all 5-foliolate, that is consisting 

 of five leaflets, which are glabrous. The flowers of this species are fragrant ; the 

 wood is yellowish white. 



The writer collected several forms, nos. 2103, 5677, in the type locality, flow- 

 ering only. 



On the Island of Maui on the eastern section, which is formed by the great 

 mass of the largest extinct volcano, Mt. Haleakala, the writer found on its 

 southern flank, on ancient, now wooded, aa lava flows, numerous trees belonging 

 to this species. They differ, however, in some respects from the Kauai specimens 

 in that the leaves are always three-foliolate and never flve-foliolate, in being 

 chartaceous instead of coriaceous, but otherwise exactly as in the specimens from 

 Kauai. At Auahi, the name of the above-mentioned locality ou Maui, the trees 

 reach a handsome size and trunks of a foot and a half or even more in diameter 

 are not uncommon, though growing never taller than 40 feet. The trees are 

 quite numerous, especially on the southern border of Auahi, where the district 

 of Kahikinui joins that of Kaupo; there the writer saw the flnest specimens, 

 which formed practically the sole tree-growth. On the northwestern slope of 



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