ONAGRACEAE. 



267 



2. Isnardia repens (Sw.) DC. Larger 

 Marsh Purslane. (Fig. 287.) Stems 2° long 

 or less, branched or simple. Leaves elliptic, 

 oval, or obovate, l'-2-|' long, acute or blunt at 

 the apex, narrowed at tlie base into rather 

 slender petioles; flowers solitary, sessile or 

 short-peduncled; bractlets linear, acute, shorter 

 than the fruiting calyx; calyx-lobes 4 or 5, 

 sharply triangular, acute, longer than the 

 petals; capsule 3"-4" long, bluntly tetragonal, 

 narrowed at the base, 3 times as long as the 

 calyx-lobes. [Ludwigia repeals Sw.; L. natans 

 Ell.] 



Frequent in fresh-water marshes. Native. 

 Southeastern and southern United States and the 

 West Indies. Its seeds were, presumably, bird- 

 transported. 



2. RAIMANNIA Rose. 



Usually low caulescent herbs. Leaves al- 

 ternate, sinuate or pinnatifid. Flowers yel- 

 low, axillary, or sometimes in terminal spikes, nocturnal; buds erect. 

 Calyx-tube sometimes filiform; calyx-segments deciduous. Ovary 4-celled, 

 elongated; ovules in 2 rows, ascending. Capsules usually narrowly cylindric, 

 sometimes slightly tapering, spreading or ascending. Seeds terete, crowned by 

 a tubercle. [In honor of Rud. Raimann, a monographer of this family.] 

 About 20 species, natives of America. Type species: Eaimannia laciniata 

 (Hill) Rose. 



Silvery-pubescent with appressed or ascending hairs; seeds striate. 1. R humifu/^n. 

 Glabrous or sparingly hirsute-pubescent ; seeds pitted. 2. R. laciniata. 



1. Raimannia humifusa (Nutt.) Rose. 

 Seaside Evexixg-primrose. (Fig. 288.) 

 Spreading and decumbent, or ascending, 

 branched from the base; stems 8-20' 

 long. Leaves aeutish or sometimes ob- 

 tuse at the apex, V-2' long, repand-den- 

 ticulate, the lower pinnatifid; flowers 

 axillary, yellow, 6"'-12" broad; calyx- 

 lobes somewhat spreading; capsule linear, 

 6"-12" long, about I*" thick, very pubes- 

 cent; seeds striate longitudinally. [Oeno- 

 thera humifusa Nutt.] 



Sand hills and sandy shores, St. David's 

 Island, Castle Point, near Tucker's Town 

 and Southampton. Native. Atlantic coast 

 of the United States. Flowers in summer 

 and autumn. 



