CISTACEAE. 225 



Burlington-^bleAioTtiL' (Br.). Gloucester— Near Mickleton, Dr. J.- B. 

 Brinton (He.). 



New Castle— Xownsend, Canby tmd JFatnaK. 

 11. Hypericum Canadense L. M. p. 628. Wet, sandy soil. Summer. 



3. SAEOTHEA L. 

 1. Sabothba qentianoides L. Orange-grass, Pime-weed. M. p. 628. Dry; 

 sandy soil. Summer. 



4. TRIADENUM Eaf. Marsh St. John >s-wort. ; | "'"''''' 



Leaves sessile; flower-clusters pedunoled. 1. T.' Virginicum. 



Leaves short-petioled ; flower-clusters nearly sessile. ■ 2: T. petiolatum. 



1. Triadenum Virginicum (L.) Eaf. M. p. 629. Swamps. Summer. 

 2: Triadenum petiolatum (Walt.) Britton. M. p: 629. Swamps. Sum- 

 mer. 



Philadelphia— Bar tram 's Garden (P.). 



Camden— Camden (C). 



New Castle— St. George's, Canty. 



Family 3. ELATINACEAE Lindl. Water-wort Family. 



1. ELATINE L. ' ! ; ' 



1. Elatine Americana (Pursh.) Am. Water-wort. M. p. 629. Margins 

 of ponds and streams. Summer. •'■ "''" ' '•" '' '•'.•-. 



Philadelphia— Philadelphia (Ca.). Bucks— Andalusia, shore of Dela- 

 ware, Mart. (B. C). Delaware— Tinicum near lee-house, A. H. Smith 

 (Fu.). 

 Camden-* Delaware River in tidal mud i(CL). Gloucester— Wenonah 



(Gi.).; Ocean— Terrago Pond (C). , , , ■ ... 



New Castle— Muddy shores of Brandywine Creeki ...,».* 



Family 4. CISTACEAE Lindl. Rock Rose Family. 



Petals 5, yellow, fugacious, or wanting. < . 



Leaves broad, lanceolate, or oblong. 1. HeUanthemum. 



Leaves subulate or scale-like, imbricated; 1 style long. 2. Hudsbnia. 

 Petals 3, not yellow,, persistent; flowers minute; style none. 



i i ■ '■< '■■ < !■..•-, i 3. Lechea. 



1. HELIANTHEMUM Pers. - Frost- weed. 



Petaliferous flowers 5-12, in terminal. clusters. 1. H. majus. 



Petaliferpus flowers solitary or rarely 2. ' 2. B. Canadense. 



1. HELIANTHEMUM majus (L.) B. S. P. M. p. 630. ' Dry soil'. Early 



summer. n , q , 



Bucks— (P.). Montgomery— (P.)> 



2, Helianthemum Canadense (L.) Michx. M. p. 631. , Sandy or gravelly 



dry soil. Early summer. 



2. HUDSONIA L. 



Flowers slender-pedicelledf leaves^ subulate'. 1. H. erieoides. 



Flowers nearly sessile; leaves scale-like. 2. H. tomentosa. 



