Araliaceae. 
species in question is also uncertain, since drupes ringed above and below the 
middle can be observed in P. Kavaiensis; the drupes of P. dipyrena are ringed 
above the middle only. 
KEY TO THE SPECIES. 
Drupe ringed at the pete 
Stigmas 2 a 3, IS Se She ev ee ae Ls ee ee ee P. gymnocarpa 
pie Hinged either above or below or at the middle. 
Stigmas 2, 3 ze We HOMSLIG vs '5-s sv ahiane Shee Ee ST © ARSON See EIT ee P. dipyrena 
Stigmas 4 i) 0O0e CODSPICUGUS BLYIC (15 Pre aa ee eee P. Kavaiensis 
Pterotropia gymnocarpa Hbd. 
(Plate 143.) 
PTEROTROPIA GYMNOCARPA Hbd. Fl. Haw. Isl, (1888) 151;—Harms in Engl. ~ gee 
Pfizf De Ss. 
zfam. III, 8 (1898) 31 oe tapleurum gymnoc arpum 1 Cast. M11. In 
cae Pac. VI (1890) 183.—Dipa nax gymnocarps Heller Pl. Haw. Isl. cass) s70. 
em ia. 4.5 to 8 em wide, ovate oblong, the lower A sae diminishing i n size on glean 
of 2 to 18 mm, obtuse or obliquely a —— ded base or unevensided, char 
taceous to coriaceous, glabrous under eath, shining shar: : runesia of panicle ‘rather 
ot with 3 to 5 umbellately eeavatine primary cdpgenes: = 10 to 20 em, the flowers 
a m 
the eg about 8 mm in length; ovary 2 to 3 celled ia one er the weiitants piers. all 
ovaries are two celled, one of which is abortive); stigmas sessile; drupe globose (accord- 
ing to Hillebr.) or oblong-turbinate in the writer’s specimens, 1 ea 15 mm ae. and 
about 7 mm in dia meter, nearly entirely free and naked, the adherent calyx forming a 
65 sad at its base; pyrenae thin papery, ovoid, peaked above and faintly notched I below 
This is a small or medium-sized tree reaching a height of 15 to 30 feet. It 
differs from the other two species in its smaller leaves and leafiets, which be- 
come quite glabrous when old, while only the very young branchlets are mealy. 
The branching habit is similar to Oahuan species of Tetraplasandra, 
rather than Pterotropia, and it is otten mistaken for such at first glance. It 
inhabits the main range of Oahu, to which island it is peculiar. It is, however, 
easily distinguished from Tetraplasandra by its rather dark foliage. 
Fine trees may be found in the forest on the windward side of Punaluu and 
above Kaliuwaa valley at an elevation of 2000 feet or more, usually along 
Streambeds and in gulches. It is associated with Pelea sandwicensis, Euphorbia 
Rockii, Hibiscus Arnottianus, Syzygium sandwicense, Elaeocarpus bifidus, Pit- 
tosporum, ete 
On Mt. Olympus at the head of Palolo Valley near the summit ridge fine 
trees may be observed; also on Mt. Konahuanui of the same range. The biggest 
trees occur in the Punaluu Mountains of the Koolau range. Hillebrand’s 
specimens came from Niu Valley. This tree is in every respect a Pterotropia 
but in habit, as it does not reach the height of the other two species, which is 
sometimes 60 to 80 feet. 
The trees from Mt. Olympus have a two-celled ovary, while those from other 
localities are three-celled. The inflorescence is not drooping, but almost erect 
above the leaves 
395 
