232 MR. H. N. RIDLEY ON PLANTS 
SUSUM MALAYANUM, Hook. f. Fl. Brit. Ind. vi. 361. 
Canoe Camp, 150 ft. 
Distrib. Malaya. 
PALMA. 
(By H. N. RIDLEY.) 
ARECA MACROCALYX, Zipp. in Blume, Rumphia, ii. 75, t. 101. 
Camp I, 500 ft. 
Distrib. Endemic in New Guinea. 
SOMMIERIA ELEGANS, Becc. Malesia, i. 68. 
Camp I, 500 ft. 
Distrib. Endemic in New Guinea. 
GRONOPHYLLUM DENSIFLORUM, Ridl., sp. nov. 
Folia 70 cm. longa, rhachi furfuracea, costa in medio pagine superioris convexa, lobis 
9 cuneatis 20-24 cm. longis, terminalibus 2 connatis ad basin latioribus, dentibus 
in marginibus 1-5 em. longis. Spadix pedunculo 3 cm. longo basi 1:5 em. lato, 
spicis tribus densifloris, rhachi validula. Bracte@ late ovate vel semi-orbiculares, 
in femineis sepalis zequilonge vel subæquilongæ. Flores d 5mm. longi. Sepala 3, 
perparva, fere linearia, valvata. Petala lanceolata, cuspidata, asymmetrica. 
Stamina 6, antheris linearibus. Flores 9 : Sepala late orbiculata, intus costata. 
Petala imbricata, basi lata, oblonga, apice abrupte anguste lanceolata et coriacea, 
sepalis bis longiora. Ovarium subglobosum, rugosum, basi abrupte angustatum 
(quasipedicellatum), uniloculare. Stigmata erecta, dentiformia, papillosa. Stami- 
nodia nulla. 
Camp VIa, 3100 ft. (In flower, January.) . 
This species differs from G.microcarpum, Scheff., in having only 2 or 3 stout short spikes 
on the spadix, in the sepals of the male flowers being very narrow and almost separate 
to the base, and in the coriaceous lanceolate point of the petals in the female being 
much narrower and more acute, whilst the thinner widely dilate base is much larger in 
proportion. The male flowers in this plant open apparently long before the females, 
which are very small at that time. When they fall they appear to leave no separate 
scar, and the female flowers develop so as to fill up the spadix so closely that the 
spadix in female flowers appears to be completely unisexual. The rhachis of the leaf 
has an elevated ridge running down the middle on the upper surface. 
The genus includes four species, two from Ceram and two from New Guinea. 
LiwosPADIx MIcHOLITZII, Ridl. in Gard. Chron. 1895, ii. 262. 
Camp I, 500 ft. ; and Camp VI a, 3100 ft. 
The original plants of this species were stemless, with entire obcuneate leaves bifid 
only atthe apex. In one of Kloss's specimens there is a portion of a stem 1 cm. in 
diameter with smooth internodes 4 cm. long, the nodes having rather a broad annulus ~ 
where the leaf has fallen. The leaves are also cut into two pairs of leaflets in addition — 
