838 USEFUL PLANTS OF GUAM. 
capsules variable, turbinate-didymous or hemispheric, terete or 4-ribbed, membra- 
nous; crown usually exceeding the calyx teeth, loculicidal at the top, many-seeded, 
seeds subglobose, testa deeply coarsely pitted. 
A variable plant often having the habit of chickweed. Growing in waste places 
on the island of Guam, Widely spread throughout the Pacific islands, the Philip- 
pines, China, and the East Indies. The allied Oldentandia umbellata L., which grows 
in India, both wild and cultivated, is the source of the chaya root, which with alum 
yields a beautiful red dye. 
REFERENCES: 
Oldenlandia paniculata lL. Sp. Pl. ed. 2. 2: 1667. 1763, 
Oleaceae. The OLIVE FAMILY. 
This family is represented in Guam. by Jasminum marianum and the cultivated 
Jasminum officinale and J. sanibac. 
Oleander. See Neriuim oleauder. 
Olena (Hawaii). See Curcumea longa. 
Onion. See Allium cepa and Gardens. 
Operculina peltata. SHIELD-LEAVED MORNING-GLORY. 
Family Convolvulaceae. 
LocaL NAMES.—Lagtin (Guam); Wa bula (Fiji). 
A climbing plant with long, tough, woody stem, large dark-green leaves, and 
milky juice. Glabrous or the veins of the leaves hairy beneath; leaves broadly 
ovate, shortly acuminate, more or less peltate, or the upper ones cordate with a nar- 
row sinus, 15 to 25 em. long; flowers large, usually white (they have also been 
described as purplish and sulphur-colored), in loose cymes on a common peduncle 
usually shorter than the petiole; sepals broad, obtuse, coriaceous, nearly equal, 
about 18 mm. long when in flower, larger when in fruit; corolla broadly campanu- 
late, at least 5 cm. long; anthers large. 
Common in Guam in rocky places along the coast, especially on Orote peninsula, 
and Apapa Island in the harbor of San Luis de Apla, spreading over bushes and 
covering the rocks with its dark-green foliage. The species is found in Tahiti, Fiji, 
Java, Amboina, and the islands on the east coast of tropical Africa. 
REFERENCES: 
Operculina peltata (.) Hallier f. Engler’s Bot. Jahrb, 16: 549. 1892. 
Convolvulus peltatus L. Sp. Pl. 2: 1194. 1755. 
Ipomoea peltata Choisy, Mem. Soc. Phys. Geney. 6: 452. 1888. 
Ophioglossales. See fern-allies. 
Ophioglossum pendulum. Same as Ophioderma pendula, See Fern-ullies. 
Opo, opu (Philippines). See Layenaria lagenaria, 
Opoponax (Southern United States). See sleacia faurnesiana. 
Opuntia sp. PRICKLY PEAR. 
Family Cactaceae. 
Local NAMEs.—Lengua de vaca (Spanish, meaning ‘cow's tongue ’’ ). 
A plant probably introduced from Mexico. Flowers vellow; fruit sweetish; not 
common on the island. The natives do not care for the fruit. 
Oramai (Ponape). See Boehmeria tenacissina. 
Orange. See Citrus aurantinm. 
Orange-berry. See 7riphasia trifoliata. 
Orchidaceae. ORCHID FAMILY. 
The following species of orchids have thus far been collected in Guam: Nervilia 
aragoana Gaudich, ( Pogonia flabelliformis Lind).) ; Luisia teretifolut Gaudich, (/piden- 
drum triste Forst.); Tueniophyllum fasciola (Forst.) Reichenb. (Vanilla fasciolu 
