Onagraceae : Haloragaceae 



659 



persistent calyx-lobes, dehiscent through a rupture of the pericarp; seeds many, small. About 40 species, in tropical and 



warm-temperate regions of the world, especially abundant in America. 



lA. Pedicels longer than the fruit; bracteoles on the lower half of ovary, deciduous; petioles with 2 stipulelike glands at base; flowers large, 



2-2.5 cm. across, bright yellow; capsules cylindric-clavate 1. L. stipulacea 



IB. Pedicels absent or very short; bracteoles very small at the base of flower; petioles without stipulclike glands at base; flowers smaller. 

 2A. Leaves 3-8 cm. long; flowers with petals; capsules cylindrical, 1.5-5 cm. long. 



3A. Stamens 8; caly.x-lobes 6-8 mm. long; petals 6-10 mm. long; capsules narrowly cylindric, about 4 mm. across. 



2. L. oclovalvis var. sessiliflora 

 3B. Stamens 4; calyx-lobes 2-4 mm. long; petals minute; capsules linear-cylindric, 1.5-2 mm. across. 



4A. Seeds in one longitudinal series in each locule; petals minute 3. L. epilobioides 



4B. Seeds in 2 series in each locule; petals about 4 mm. long 4. L. greatrexii 



2B. Leaves 1-2.5 cm. long; flowers apetalous; capsules ellipsoidal to nearly globose, 4-5 mm. long 5. Z.. ovalis 



1. Ludwigia stipulacea (Ohwi) Ohwi. Jussiaea stipu- branched, slightly ridged, reddish, 30-60 cm. long; leaves alter- 

 lacea Ohwi; /. repens sensu auct. Japon., non L.; Ludwigia nate, lanceolate or oblong-lanceolate, 3-12 cm. long, 1-3 cm. 



adscendens var. stipulacea (Ohwi) Hara Mizu-kimbai. wide, gradually acute, acuminate at base, entire, with 7-15 pairs 



Nearly glabrous rhizomatous perennial somewhat viscid in up- of lateral nerves, the petioles 5-15 mm. long; flowers sessile; 



per part in life; stems terete, ascending or creeping at base, ovary minutely appressed-pilose; calyx-lobes ovate, 2-A mm. 



erect above, 25-30 cm. long; leaves alternate, oblanceolate, ob- long, acute; petals minute; stamens 4; capsules linear-cylindric, 



long-lanceolate to narrowly oblong, 4-7 cm. long, 1.3-2.5 cm. somewhat obtusely angled, 1.5-3 cm. long, 1.5-2 mm. wide; 



wide, obtuse to subacute or sometimes rounded at apex, gradu- seeds fusiform, about 1 mm. long, in one longitudinal series in 



ally narrowed at base, entire, the petioles 1-1.5 cm. long, with each locule, enveloped in a spongy pericarp, with brown longi- 



2 sdpulelike glands at base, the lateral nerves rather many, tudinal striations. Aug.-Oct. Wet places in lowlands espe- 



parallel, ascending; flowers axillary, solitary, 2-2.5 cm. across, cially in paddy fields; Honshu, Shikoku, Kyushu; conunon. 



bright yellow, the bracteoles on lower part of ovary, broadly Widely distributed throughout the Tropics. 



ovate, about 2 mm. long; calyx-lobes 4, sometimes 5, lanceo- 4. Ludwigia greatrexii Hara. Jussiaea greatrexii (Hara) 

 late, 8-10 mm. long, acuminate; petals broadly obovate, about Hara^ — — Usuge-choji-tade. Much resembling the preceding, 

 13 mm. long, emarginate; stamens twice as many as the calyx- but with somewhat larger flowers, white-villous on the disc, 

 lobes, in 2 series, the disc densely white-villous; capsules and smaller seeds arranged in 2 longitudinal series in each 

 cylindric-clavate, 2-2.5 cm. long, narrowed to the base, the locule, and the young shoots more pubescent; stems short- 

 pedicels 3-4 cm. long; seeds obliquely 4-ang!ed, about 2 mm. pubescent while young; leaves puberulent on both sides espe- 



across. July-Sept. Ponds and ditches in lowlands; Hok- cially while young, 7-8 cm. long, 1-2 cm. wide; flowers sub- 



kaido, Honshu, Shikoku, Kyushu. sessile, densely appressed-puberulent, the bracteoles minute or 



2. Ludwigia octovalvis (Jacq.) Raven var. sessiliflora absent; calyx-lobes usually 5, 3-4 mm. long; petals obovate, 4 

 (Michcli) Ra\en. Jussiaea octonervia var. sessiliflora Micheli; mm. long; stamens usually 5, the disc \\'hite-villous; capsules 

 /. suffruticosa L.; /. villosa Lam.; L. pubescens var. villosa usually 5-locular, the endocarp rather thick, not corky, not 



(Lam.) Hara Kidachi-kimbai. Coarsely hirsute, suflruri- closely adherent to the seeds; seeds oblong, slighdy curved, 0.8 



cose herb; stems erect, branched, 40-100 cm. long; leaves Ian- mm. long, with an obscure ridge. Honshu (Kadzusa, and 



ceolate, 4-8 cm. long, 5-12 mm. wide, subobtuse, short-petio- Suruga Prov.), Kyushu; rare. 



late; flowers solitary in axils, pale yellow, subsessile, the 5. Ludwigia ovalis Miq. Mizu-yuki-no-shita. Gla- 



bracteoles minute or absent; ovary and calyx more or less brous perennial; stems long-creeping at base, 20-40 cm. long, 



hirsute while young; calyx-lobes ovate, 6-8 mm. long; petals terete; leaves alternate, broadly ovate, ovate-orbicular to ellip- 



nearly orbicular, 6-10 mm. long, the disc with 4 tufts of hairs; tic-orbicular, 1-2.5 cm. long, 1-2 cm. wide, rounded to very 



capsules narrowly cylindric, 3-5 cm. long, about 4 mm. wide, obtuse, abruptly narrowed at base, entire, the lateral nerves of 



terminated by the persistent calyx-lobes, narrowed to the base; 4-6 pairs, the petiole to 7 mm. long; flowers solitary, sessile, 



seeds many, rounded, emarginate. Aug.-Oct. Wet places; apetalous, pale green-yellow, the bracteoles small, at base of the 



Kyushu (Yakushima). Widely distributed in the Tropics. ovary; calyx-lobes 4, deltoid, about 2 mm. long, acute; stamens 



3. Ludwigia epilobioides Maxim. Nematopyxis japon- 4; capsules ellipsoidal or nearly globose, 4-5 mm. long; seeds 

 ica Miq.; Jussiaea fauriei Lev.; /. japonica Lev.; /. philippiana ovoid, about 0.8 mm. long, red-brown, lustrous, with an ap- 



Lev.; /. prostrata sensu auct. Japon., non Lev.; L. prostrata pendage on one side. July-Oct. Wet places; Honshu, Shi- 



sensu auct. Japon., non Roxb. Choji-tade. Annual, scat- koku, Kyushu. Formosa. 



tered-puberulent while young; stems erect or ascending, 



Fara. 150. HALORAGACEAE Ari-no-to-gusa Ka Water-milfoil Family 



Herbs or shrubs, sometimes aquatic; leaves alternate, opposite, or verticillate, the immersed ones often finely dissected, 

 stipules absent; flowers bisexual or unisexual, solitary, in corymbs or panicles, often very small; calyx-tube adnatc to the ovary, 

 the lobes obscure or 2-4, slightly imbricate or valvate; stamens 2-8, the anthers basifixed, longitudinally spht; ovary inferior, 

 1- to 4-locular; styles 2-4; ovules pendulous, as many as the styles; fruit a small nut or drupe, often winged, indehiscent; seeds 

 with endosperm. About 7 genera, with about 100 species, in the Tropics and temperate regions. 



lA. Terrestrial herbs or rarely subshrubs ligneous at base; leaves opposite; flowers solitary or more often racemose; petals 4; stamens 



usually 8 1 . Haloragis 



IB. Aquatic herbs; leaves verticillate (in ours); flowers axillary or in a terminal spike; petals 2—4 or absent; stamens 2-8. . . 2. Myriopfiyllum 



