290 USEFUL PLANTS OF GUAM. 



cific name was given it by Gaudichaud in honor of Don Luis de Torres, sarjento- 

 mayor at the time of De Freycinet's visit to the island. 

 References: 



Gynopogon torresianus (Gaudich.) K. Sch. & Laut. Fl. Deutsch. Schutzgebiete. 



in der Siidsee 504. 1901. 

 Alyxia torresiana Gaudich. Bot. Freyc. Voy. 451. 1826. 

 Habal (Philippines). See Elephantopus spicatus. 

 Habas (Spanish, from f aba, Latin). See Phaseolus lunatus inamoenus. 

 Haigiie (Guam). A coconut which has sprouted. 

 Hala (Hawaii). See Pandanus tectorius. 

 Halimedia. See under Aigse. 

 Halodule uninervis. 



Family Potamogetonaceae. 

 Local names. — Chaguan-tasi. 

 A plant somewhat resembling eelgrass (Zostera) in miniature, growing in salt 

 water. It is dioecious; the flowers, arranged in pairs, have no perianth; the pistil- 

 late ones reduced to an ovary with a short style and a long, thread-like stigma; the 

 staminate consisting of two anthers growing together along their backs, with two 

 parallel cells opening outwards by longitudinal slits. 



This genus is closely allied to Cymodocea, but differs in having the male flowers 

 at slightly different heights on the flower stem and in having one instead of two 

 stigmas. The fruits are roundish-oval and scarcely appressed; leaves narrowly 

 linear, with distinct midrib and two marginal veins and without definite finer vena- 

 tion, the margins each prolonged into a tooth at the apex, between which the apex 

 of the leaf projects. 

 References: 

 Halodule uninervis (Forsk. ) Boiss. Fl. Orient. 5: 24.1884. 

 Zostera uninerva Forsk. Fl. Aegypt. Arab. 157. 1775. 



Diplanthera tridentata Steinheil, Annal. Sc. Nat. II. 9: 98. t. 4- /■ B. 1838. 

 Halom (Philippines). See Amaranthus oleracem. 

 Halophila ovata. Same as Halophila ovalis. 

 Halophila ovalis. 



Family Vallisneriaceae. 

 A plant growing in the sea, often near low-water mark or deeper, and at the mouths 

 of streams. Stems creeping and rooting under water, having at each node a pair of 

 oval or oblong-elliptical, thin, feather-veined leaves with entire margins and long 

 petioles; at the base of the petioles 2 broad, thin, colorless, hyaline scales, within 

 which are the ovate sessile involucres or double spathes inclosing the flowers; male 

 flowers on pedicels emerging from the involucre; perianth of 3 segments; anthers 3, 

 sessile, alternating with the segments, erect, 2-celled, the cells opening outward; 

 pollen confervoid; female flowers without perianth, sessile within the involucre; 

 ovary single, tapering into a filiform style with a short stigma, either entire or 

 divided into 3 to 5 filiform segments; ovules several, erect, attached to the sides of 

 the cavity; fruit membranous, opening irregularly; seeds nearly globular, with a 

 thin testa. 



This species was first collected in Guam by Gaudichaud. It is often washed up on 

 the beach with algae. a 

 References: 

 HalopMla ovalis (R. Br.) Hook. Fl. Tasm. 2: 45. 1860. 

 Caulinia ovalis R. Br. Prod. 339. 1810. 

 Halophila ovata Gaudich. Bot. Freyc. Voy. 430. t. 40. f. 1. 1826. 



« Bot. Freycinet Exp. 430, 1826. 



