MYRMECONAUCLEA, A NEW GENUS OF RUBIACEOUS 
PLANTS FROM PALAWAN AND BORNEO 
By ELMER D. MERRILL 
Director and Botanist, Bureau of Science, Manila 
MYRMECONAUCLEA genus novum . 
Flores in capitulum globosum compacti, ebracteolati, calycibus 
arcte concretis, lobis 5, partes deciduae spathulatae, partes per- 
sistentes lanceolatae. Corollae tubus anguste infundibularibus. 
Stamina in tubo corollae inclusa. Stylus elongatus, stigma sub- 
globosum. Fructus in syncarpium globosum vel depresso-globo- 
sum connati, endocarpium superne incrassatum. Semina longe 
alata. Arbuscula, foliis oppositis, stipulatis; capitulis solitariis, 
terminalibus bracteatis. 
MYRMECONAUCLEA STRIGOSA (Korth.) comb. nov. 
Nauclea strigosa Korth. Verh. Nat. Gesch. (1839-42) 157; Mig. FI. 
Ind. Bat. 2 (1857) 188; Havil. in Journ. Linn. Soc. Bot. 33 (1897) 
627... 
Sarcocephalus fluviatilis Elm. Leafl. Philip. Bot. 4 (1912) 1357. 
Neonauclea strigosa Merr. in Journ. Wash. Acad. Sci. 5 (1915) 542. 
This characteristic species was originally described from Bor- 
nean material, and is at present known only from Borneo and 
Palawan. Haviland has given an excellent detailed figure of 
it, and also gives a rather lengthy discussion of it. Korthals 
had no fruiting specimen, and hence placed it in the genus Nauw- 
clea (— Neonauclea). Haviland followed him in this disposition 
of it although he indicated that it was anomalous in this genus 
in that its fruit is concrete and forms a syncarp. I consider 
that it is as anomalous in Sarcocephalus, where it was placed 
by Elmer, as it is in Nauclea and accordingly have proposed 
a new generic name for it. It differs radically from Nauclea 
auct. (— Neonauclea) in its concrete fruits forming a syncarp 
and as radically from Sarcocephalus (= Nauclea Linn.) in its 
winged seeds. 
Haviland has discussed somewhat at length the peculiar fruit 
characters of this species, but he apparently did not have fully 
mature fruits. In age the persistent tips of the calyx segments 
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