CISTACEAE 213 



10. Hypericum mutdlum L. Dwarf St. John's-wort. (Man. p. 

 628; I. F. / 2458.) In low grounds, N. S. to Man., Fla., Kans., and 

 Tes..— Pennsylvania : Monroe ; Northampton ; Bucks ; Montgom- 

 ery ; Philadelphia ; Delaware ; Chester ; Lancaster ; Dauphin ; 

 Franklin ; Huntingdon ; Erie ; Allegheny. 



11. Hypericum gymnanthum Engelm. Clasping-lEAVED ST. 

 John's-wort. (Man. p. 628; I. F./. ^^59.) Inlow ground."?, N. J. and 

 Del. to Minn., L,a. and Tex. — Pennsylvania: Bucks, Bristol; Dela- 

 ware, Tinicum. 



12. Hypericum majus (A. Gray) Britton. Larger Canadian St. 

 John's-wort. (Man. p. 628; L F. /. 2460.) In moist soil. Me. to 

 Mich., N. J., and Neb. — Pennsylvania : EriE, Presque Isle. 



13. Hypericum Canadense L. Canadian St. John's-wort. (Man. 

 p. 628; I. F. /. 3461.) In wet, sandy soil, Newf. to Man., Ga., Ky. and 

 Vfis.— Pennsylvania : Monroe ; Northampton ; Bucks ; Delaware, 

 Tinicum ; CHESTER ; Lancaster ; York ; Schuylkill ; Huntingdon ; 

 Erie, Presque Isle ; FayBTTE. 



3. SAROTHRA L. 

 1. Sarothra gentlanoides L- OrangE-GRASS. PinE-wEEd. (Man. 

 p. 628 ; I. F./. 3463.) In sandy soil. Me. to Fla., Ont, Minn., Mo. and 

 Tex. — Pennsylvania : Monroe ; Northampton ; Delaware ; Ches- 

 ter; Lancaster; York; Schuylkill; Bedeord ; Huntingdon; 

 Allegheny. 



4. TRIADBNUM Raf. 



Leaf -blades sessile and partly clasping : flower-clusters peduncled. 



I. T. Virginicum. 

 Leaf -blades petioled : flower-clusters sessile or nearly so. 2. T. petiolatum. 



1. Triadenum Virginicum (L.) Raf. Marsh St. John's-wort. 

 (Man. p. 629 ; I. F. f. 2464.) In swamps, Lab. to Fla., Man., Neb. and 

 La. — Pennsylvania : Monroe ; Northampton ; Bucks ; Montgomery ; 

 Delaware ; Chester ; Lancaster ; York ; Schuylkill ; Luzerne ; 

 Franklin ; Clarion ; Craweord ; Allegheny. 



2. Triadenum petiolatum (Walt.) Britton. LARGER Marsh St. 

 John's-wort. (Man. p. 629 ; I. F. /. 246J.) In swamps, N. J. and Md. 

 to Fla., Ark. and La. — Pennsylvania: Philadelphia (Bartram's Gar- 

 den); Crawford; Erie. 



Family 2. ELATINACEAE Lindl. Water-wort Family. 

 1. ELATINE L. 

 1. Elatlne Americana (Pursh) Arn. Water-wort. Mud-purslane. 

 (Man. p. 629; I. F. f. 2466.) Margins of ponds and slow streams, Me. 

 and Ont. to Va., Mo. and Tex. — Pennsylvania: Philadelphia ; Dela- 

 ware, Tinicum. 



Family 3. CISTACEAE Lindl. Rock-rose Family. 



Corolla yellow : petals 5, fugacious or wanting. i. Helianthemum. 



Corolla not yellow : petals 3, persistent. 2. Lechea. 



