Rutaceae. 
Leaflets thick coriaceous, opaque, obtuse or roun nded, the —— a subsessile, 
truncate at the base, rhomboidal, the lower half much produced, almost auriculate, the 
Tib | eke or more often glabrate, the median leaflet rarely aetinnlate: panicles simple 
or compound. 
The writer’s number 8071, collected in Mahana Valley, Lanai, is the typical 
var. y, while number 8217 has the leaves not quite so coriaceous and has densely 
flowered panicles. 
Var. rigidum Rock var. nov. 
(Plate 80.) 
A small tree 5 m high, with few very stiff stout branches, leaves three foliolate, on 
petioles of 5 to 6 em, leaflets ovoid to ovoid- Pega bluntly ekg geal at the bas 
ule the media afle 
n articu 
petiolule of 3 em, 12 to 15 em lon , & to 12°em Wile: (h ein the largest leaves of any 
Hawaiian Xanthoxylum) thick coriaceous, opaque, with prominent stramineous midrib 
and veins; oo densely flowered, 9 to 12 em one: on = compressed peduncles of 
3.5 to 4 em, ultimate pedicels 6 mm, ‘follicle as in the ci 
Collected on “the Island of Maui on the dork wtacen slopes of Haleakala in 
Waihou gulch, back of Makawao, elevation 3000 feet, March, 1912, in company 
with Pseudomorus Brunoniana and Sidcrox ylon Ceresolii. Type is number 
10200 in the Herbarium of the College of Hawaii. It is a small tree 15 feet 
high and is peculiar to Mt. Haleakala, where it grows in the drier regions on the 
Steep slopes of Waihou gulch. 
From the Kaala Mt., Oahu, Hillebrand describes a variety § with 3 to 5-foliolate 
leaves. The writer is not acquainted with this variety. 
Var. anceps Rock. var. nov. 
Leaves trifoliolate on petioles of 8 to 12 ¢ em, pubescent with whitish ae Aig lanceo- 
late to ovate-lance eolate, the lateral ones se ssile, almost rhor pot gen Bee line, very un- 
evensided, acuminate at the apex, the ter aun ets on a ae etiole of 39 ~ 30 mm, which 
5 
pubescent, petals cream- colored, 5 mm fone ovo ad acute, a shorter, er ae 
orbicular, ovary pronounced, though rudimentary; follicle only 8 mm, minutely pitte 
A medium-sized tree 20 feet in height, pubescent throughout. It is peculiar 
to the Island of Hawaii, where it grows near the Volcano of Kilauea at an ele- 
vation of 4000 feet in the Kipuka Puaulu, which is so rich in species. A number 
of other species of Xanthoxylum are found in this small area (56 acres), which 
is surrounded by ancient aa lava flows which are in turn covered by a forest of 
Acacia Koa. 
Specimens of this variety were collected flowering and fruiting by the writer 
in July, 1911. The type is number 10201 in the College of Hawaii Herbarium. 
The name anceps refers to the broad and compressed pedunele. 
In the same locality another form was collected with 3 to 5 leafiets which are 
glabrous and coriaceous. In fruit only, the leaves resemble more var. rigidum 
(no. 10202) 
