Rutaceae. 
To the variety anceps must be referred another tree found in the same locality. 
The inflorescence is exactly as in the variety, but the leaves, which are also 
pubescent, have three but rarely five leaflets which are subcordate to truncate 
at the base; the lateral ones instead of being sessile are on petiolules of about 10 
mm and are subcordate to unevensided; the leaflets remind one very much of 
those of Pterotropia Kauaiensis. The terminal leaflet is also articulate. Evi- 
dently the length of the petiolules of the lateral leaflets, on which Hillebrand laid 
so much stress, is not a good specific character. According to his key to the 
species, this latter form, which may be known now as forma petiolulatum f. n., 
would belong to XY. hawaiiense, rather than to Y. mauiense, but can not be sep- 
arated from the latter, as it differs otherwise very materially from the former 
species, whose lateral leaflets are practically deltoid, with petiolules as long as 
the terminal one. These varieties and forms seem to be intermediates between 
‘X. mauiense and XY. hawaiiense, though reminding one much more of the former 
than of the latter. 
Xanthoxylum dipetalum Mann. 
5 wise gs pang ea Mann in — Bost. Soc. Nat. Hist. X. este 160, et 
Ess. Ins . (1868) 170;—_H bd. Haw. Isl. (1888) 76;—Del Cast, Ill. Fl. 
ine “Mr. fred VE (1890) 129 eae dtpetala Engl. in Engl. et Pr ae Pfizfam. 
IIT. 4, (1895) 119 
Leaves 15. to 18 em long rigor a petiole of 2.5 to 3.5 em, pinnately 5 to 7 folio- 
late, the lowest pair of leaflets generally with a pair of ele or parlimncnt folioles 
close to its base; lateral | See totes 6 mm, the terminal one 12 to 18 mm, often articulate; 
leaflets oblong 7.5 to 8.7 st aie ng, 3.75 to 4.5 em wi e, abeuse, = contracting ae nea arly 
symmetrical at the bas a coriaceous, with faint nerves and ny pellucid dots, glossy; 
panicles terminal and arponttiteliows, 7.5 to 10-em long, with a » peduncle of 2.5 to 3.75 em 
and suberect branches, the ternate flowers on pedicels of 6 mm lateral pedicels 
minutely bracteate below the middle; male flowers: sepals 4, red, little rect than 
I igh; petals 2, lanceolate, thick coriaceous and valvate m long, s 4, 
scarcely half the lengt th of the athe Notes d on the edge of the ae with ate eons 
anthers of 2 to 3 mm; ovary rudiment 
This very interesting species, which is quite distinct from all the other Ha- 
Walian Xanthoxyla, was first collected by Dr. Wm. Hillebrand and communicated 
by him to H. Mann, who described it. The writer is only acquainted with sev- 
eral forms or varieties of this species found on the other islands, but has never 
collected the species proper, found on Oahu by Hillebrand on the slopes of 
Waiolani, also called Lanihuli, in Nuuanu Valley. The dipetalous flowers occur 
in the Species, and in the varieties the flowers are tetramerous. It is a tree about 
30 feet high and quite glabrous. In regard to the dipetalous flowers Hillebrand 
quite correctly states: ‘‘The reduced number of the petals in the species is 
Owing not to a suppression of a pair, but to coalescence of two contiguous petals ; 
it is not so much therefore on the strength of these characters that the present 
Species must claim a place distinct from the preceding ones within the genus, as 
for its mode of inflorescence and the presence of the supplementary pair of 
reduced leaflets in such an extraordinary position, where they appear like ap- 
pendages of the lowest folioles.’’ 
207 
