THE PHILIPPINE JOURNAL OF SCIENCE, C. BOTANY. 
Vou. IX, No. 3, JUNE, 1914. 
NEW OR NOTEWORTHY AQUATIC PLANTS 
By C. H. OSTENFELD 
(Copenhagen, Denmark) 
In a miscellaneous collection of aquatic and subaquatic plants 
submitted to me by the Bureau of Science, the following novelties 
were found. The bulk of the collection was from the Philip- 
pines, but it contained also a set of the aquatic plants collected 
by the late Dr. C. B. Robinson in the vicinity of Nha-trang, 
Annam, Indo-China, in March, 1911. A single species is based 
on the Annam material, the others being Philippine. 
HYDROCHARITACEAE 
OTTELIA Persoon 
OTTELIA PHILIPPINENSIS sp. nov. 
Planta submersa mediocris, 6 ad 15 cm alta. Foliorum petioli 
laminis longiores. Laminae ovatae vel cordato-ovatae, 4 ad 7 
cm longae, 2 ad 3.5 cm latae, apicibus obtusiusculis. Flores 
foliis breviores, petiolis 2 ad 7 cm longis. Spatha ca. 2 cm longa, 
oblonge ovata, fructifera ovata, alis bene evolutis usque 5 mm 
latis crispis ornata. Sepala oblonge obovata, obtusa, ca. 7 mm 
longa, nervis obsoletis. Petala alba. Stamina stigmataque ca. 
6mm longa. Semina dense hirsuta ut in O. alismoidi. 
Differt ab O. alismoidi statura minore, foliorum laminis ovatis, 
ab O. japonica spathae alis latis crispisque etc. 
LuzoN, Province of Nueva Vizcaya, Dupax, Bur. Sci. 11414 McGregor, 
March, 1912 (type in the Herbarium of the Botanical Museum of Copen- 
hagen, cotype in the Herbarium of the Bureau of Science, Manila), locally 
known as tangila and used as a potherb. MINDORO, Bulalacao, Bur. Sci. 
6679 Robinson, March, 1909. 
CALDESIA Parlatore 
CALDESIA SAGITTARIOIDES sp. nov. 
Caules floriferi 10 ad 20 cm alti, erecti, verticillatim racemosi, 
foliis aequilongi vel breviores. Foliorum nutantiorum laminae 
late ovatae, 1.5 ad 1.8 cm latae, 2.5 ad 3 cm longae, acutiusculae, 
T-nerviae; foliorum emersorum laminae hastatae vel late sagit- 
tiformes, 1.8 ad 2 cm latae, 2 ad 3 cm longae, 9-11-nerviae; lobi 
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