[Vor. 1 
408 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
to the Mexican plant in question. It seems advisable, there- 
fore, to regard the south Mexican plant as a distinet species 
which may be further characterized as above. 
OECOPETALUM Greenman & Thompson, gen. nov. Jcacinacee 
Calyx 5-lobus. Petala 5 hypogyna valvata intus costata, 
margine et apice inflexa. Stamina 5 hypogyna petalis alterna 
et iis basi coherentia, filamentis dilatis glabris apice contractis; 
anther erect: lanceolate basi sagittatæ connectivo latiusculo; 
thece laterale remote et in cavitatibus petalorum recepte. 
Discus obsoletus. Ovarium uniloculare, stylus erectus conicus, 
stigma terminale. Ovulum 1 pendulum. Fructus ignotus.— 
Frutices vel arbores. Folia alterna coriacea integerrima. 
Flores cymis brevibus axillaribus dispositi. 
О. mexicanum Greenman & Thompson, sp. nov. Plate 25. 
Frutex (?) vel arbor (?); ramis cortice griseo tectis; ramulis 
juventate sericeo-pubescentibus mox glabratis; foliis alternis 
petiolatis elliptico-lanceolatis 1-2,5 dm. longis 3.5-10 ет. latis 
brevi-acuminatis obtusis integerrimis utrinque glabris vel prae- 
sertim in nerviis sparsissime adpresso-puberulentis subtus palli- 
dioribus basi sensim angustatis acutis, petiolis 7-15 mm. longis 
supra canalyculatis; inflorescentiis in axillariis superioribus 
cymosis plus minusve adpresso-sordido-pubescentibus, pedun- 
culo usque ad 2 em. longo; floribus cum pedicello articulatis et 
caducis; calyce griseo-tomentoso parvo circiter 2 mm. alto 
5-lobato, lobis ovatis obtusis 1 mm. longis; petalo 5 oblongo- 
lanceolato 8 mm. longo 2 mm. lato verisimiliter albo utrinque 
glabro intus longitudinaliter insigniter unicostato; ovario et 
stylo glabro; fructu et seminibus ignotis. 
Specimen examined: 
Mexico: State of Vera Cruz, Sierra Madre near Miscantla, 
August, 1912, С. А. Purpus, 6159 (Mo. Bot. Gard. Herb.) 
TYPE. 
Specimens of the plant here described were submitted to the 
Missouri Botanical Garden for determination by Mr. Т. 8. 
Brandegee who suggested its probable relationship with Mappia. 
After a careful study of the material at hand it seems unmis- 
takably to belong to the Icacinaceae, but until the fruit is 
known its exact position in the family must remain doubtful. 
