EVENING PRIMROSE FAMILY 561 



orbicular and with longer petioles; calyx-lobes lanceolate, I/2 inch long; petals 

 broadly obovate, 6 to 7 lines long; fruit woody, cylindric, 10 lines long, indehis- 

 cent, at length reflexed and the calyx-lobes deciduous from the mature fruit; fruit- 

 ing pedicel l^ to % inch long ; seeds large for the family, with a very thick tough 

 outer coat. 



Rivers, creeks and lakes, 5 to 1500 feet : widely scattered in cismontane Cali- 

 fornia. June-Aug. 



Locs. — Coast Eanges: Clear Lake, Lake Co., Jepson 14,375; Monte Rio, Sonoma Co., Char- 

 lotte Roah; Warm Sprs., w. Alameda Co., Jepson 14,377; Pajaro Hills, Monterey Co., Chandler 

 460. Great Valley: Cache Slough, Solano Co., Jepson 14,376; Ryer Isl., Solano Co., Jepson 

 14,378; Old Eiver, San Joaquin Co., Jepson 10,031; Grayson, San Joaquin River, Jepson 10,290; 

 Los Banos, M. S. Jussel; Four-mile Slough, Fresno Co., Jepson 13,316; Lemon Cove, Tulare Co., 

 Jepson 559; Bakersfield, Davy 2431. Tuolumne Co.: (?) Mountain Pass, Grant 790 (herbage 

 hirsute). S. Cal.: Bixby Lake, Los Angeles Co., K. Brandegee; Fullerton, Hall 3288; Compton, 

 Condit; Riverside, Hall. 



Refs. — JussiEUA CALIFORNICA Jepson, Fl. W. Mid. Cal. 326 (1901), ed. 2, 273 (1911), Man. 

 666, fig. 653 (1925). J. repens var. calif orniea Wats.; B. & W. Bot. Cal, 1:217 (1876), type loc. 

 Clear Lake, Cache Creek, Bolander 2645. Ludwigia diffusa var. calif orniea Greene, Fl. Fr. 227 

 (1891). J. diffusa Greene, Man. Reg. S. F. Bay 138 (1894) ; not J. diffusa Forsk. (1775). 



2. LUDWIGIA L. 



Aquatic or marsh perennial herbs, with the aspect of Jussieua, but the leaves 

 (in ours) opposite, parts of the flower in 4s, and the petals often absent. Calyx- 

 tube none. Stamens as many as the petals and alternate with them. Ovary broad 

 at apex and usually flattened, or crowned with a conical style-base. Capsule 

 4-celled, dehiscent by lateral slits or terminal pores. Seeds minute. — Species 20, 

 all continents. (C. G. Ludwig, 1709-1773, Professor of Botany at Leipsic.) 



Fruit broadly oblong, tuberculate, 1^4 to 2*4 lines long 1. L. palustris. 



Fruit inversely pyramidal, smooth, 3 to 3% lines long 2. L. natans. 



1. It. palustris Ell. Water-Strife, Stems 6 to 12 inches long; herbage 

 glabrous; leaf -blades obovate, acute or acuminate, narrowed at base into a rather 

 long petiole, the whole leaf 8 to 13 lines long; petals none, or minute and reddish; 

 capsules erect, broadly oblong, II/2 to 2 lines long, more or less 4-sided or -angled, 

 a narrow longitudinal band of low tubercles on each side, yellowish, the persistent 

 sepals green. 



Muddy shores or overflowed lands, 300 to 2800 feet : North Coast Ranges from 

 Sonoma Co. to Siskiyou Co. ; Butte Co. East to the Atlantic, north to Canada, 

 south to South America ; Europe. July- Aug. 



Locs. — Coast Ranges: Glen Ellen, Sonoma Co., Michener 4" Bioletti 707a; Healdsburg, Alice 

 King; Cold Creek, Kelseyville, BlanTcinship ; Lakeport, Jepson; Seott Creek, Lake Co., Tracy 

 2381 ; Trinity River Valley near the South Fork, Tracy 7765 ; Oro Fino, Siskiyou Co., Butler 

 1791. Butte Co.: Oroville, Heller 11,683. 



Refs. — Ludwigia palustris EU. Sketch Bot. S. C. & Ga. 1:211 (1821) ; Jepson, Fl. W. Mid. 

 Cal. 326 (1901), ed. 2, 273 (1911), Man. 666 (1925). Isnardia palustris L. Sp. PI. 120 (1753), 

 "in Galliae, Alsatiae, Russiae, Virginiae fluviis". 



2. L. natans Ell. Marsh-Strife, Stems simple or branched, diffuse, ^ 

 to iy2 feet long; herbage glabrous; leaves % to 2% inches long, the blades ovate 

 or obovate, acute or obtuse, narrowed at the base to a petiole; sepals ovate-acumi- 

 nate, 2 lines long; petals white, % to 1 line long; capsules 3 to 3% lines long, rust- 

 color, inversely pyramidal, 4-sided, the faces with a shallow median groove; pedi- 

 cels % to 1% lines long. 



Streams and marshes, 1000 to 1500 feet: San Bernardino Valley. East to 

 Florida and North Carolina, south to Mexico. June-Aug. 



Loc, — Ludwigia natans, widely distributed beyond our borders, was first discovered in Cali- 

 fornia by Parish in the San Bernardino VaUey in 1881. This appears to remain still the only 

 known locality for our region. 



