338 USEFUL PLANTS OF GUAM. 



capsules variable, turbinate-didymoiis or hemispheric, terete or 4-rihlieil. membra- 

 nous; crown usually exceeding the calyx teeth, loculicidal at the top, many-seeded; 

 seeds subglobose, testa deeply coarsely pitt«l. 



A variable plant often having the habit of chickweed. Growing in waste places 

 on the island of Guam. AVidely spread throughout the Pacific islands, the Philip- 

 pines, China, and the East Indies. The allied OMenlaiidia umbeUata L., which grows 

 in India, both wild and cultivated, is the source of the chaya root, which with alum 

 yields a beautiful red dye. 

 Eeferexces: 



Oldenlandia paniciUata L. Sp. PI. ed. 2. 2: 1667.1763. 

 Oleaceae. The Ouve family. 



This family is represented in Guam by Jagminum marlamim and the cultivated 

 Jasminum officinale and J. sambac. 

 Oleander. See Xerium oleander. 

 Olena (Hawaii). See Chircuvin longa. 

 Onion. See Allium cepa and Gardeux. 



Operculina peltata. Shield-le.vved morxixg-glory. 



Family Convolvulaceae. 



Local names. — Lagun (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 tm. long; flowers lai^, 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 Apia, 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. 

 Eeferexces: 



Opercidiua peltala (L.) Hallier f. Engler's Bot. Jahrb. 16: 549. 1892. 

 Comolrulus peltahts 1,. Sp. PI. 2:1194. 1753. 

 Ipomoea peltata Choisy, Mem. Soc. Phys. Genev. 6: 4.52. 1833. 

 Ophioglossales. See Fem-allifs. 



Ophioglossum pendulum. Same as Ophiudei-ma pcndiila. See Feni-allies. 

 Opo, opu (Philippines). See Lagenariu lagenuria. 

 Opoponaz (Southern United States). See -Icacia fanuviaiui. 



Opuntiasp. Prickly pear. 



Familv Cactaceae. 



Local xames. — Lengua de vaca (Spanish, meaning "cow's tongue") 

 A plant probably introduced from Mexico. Flowers yellow; fruit sweetish; not 

 common on the island. The natives do not care for the fruit. 

 Oramai (Ponape). See Boehmeria tenacii<sii)iu. 

 Orange. See (yitnis aurantium. 

 Orange-berry. See TVipha.tid Irifoliata. 



Orchidaceae. , ORCHin famih'. 



The following species of orchids have thus far been collected in Guam : Xerrilia 



aragouna Gaudich. (Pogoniajiabelliformia Lindl.) ; Liiisin tor(i/o/ia Gaudich. {Epiden- 



drum triate Forst. ); Taeniophyllum fasdola (Forst.) Reichenb. (Vanilla fasciola 



