222 ONAGRACEAE 



2. LUDWIGIA L. 



Corolla wanting or obsolete : flowers sessile : capsule valvate. 



1. L. sphaerocarpa. 

 Corolla conspicuous : flowers peduncled : capsule opening by a terminal pore. 



2. L. allernifolia. 



1. Ludwigia sphaerocarpa Ell. Globe-fruiTED Ludwigia. (Man. 

 p, 653 ; I. F. f. 2^57.) In swamps, eastern Mass. and southern N. Y. to 

 Fla., west to La. — Pennsylvania : Bucks, Bristol. 



2. Ludwigia laternifolia L. Seed-box. Rattle-box. (Man. p. 

 654; I. F. /. i-j^j.) lu swamps, N. H. to northern X. Y., Ont. (?), Mich., 

 Fla., Kans. and Tex. — Pennsylvania: Northampton; Bucks; Dela- 

 ware ; Chester ; Lancaster ; Columbia ; Huntingdon ; Alle- 

 gheny. 



3. CHAMAENERION Adaus. 



1. Chamaenerion angustifolium (L. ) Scop. Great or Spiked WiL- 

 LOW-herb. Fire-weed. (Man. p. 655; I. F. /. Z566.) In dry soil. 

 Lab. to Alaska, N. C, Kans., Ariz, and Calif. Also in Eu. and Asia. — 

 Pennsylvania: Lackawanna; Monroe; Schu\xkill; Luzerne; 

 Cambria ; Northampton ; Bucks ; Philadelphia ; Chester ; Lan- 

 caster ; Centre ; Allegheny. 



4. EPILOBIUM L. 



Leaf -blades linear to lanceolate, essentially entire. 



Leaf-blades petioled : plants canescent. i . E. lineare. 



Leaf-blades sessile : plants glandular-pubescent. 2. E. slrictum. 



Leaf-blades ovate to lanceolate, serrate. 



Flowers drooping : seeds obconic, beakless : coma reddish. 



3. E. coloratuvi. 

 Flowers erect : seeds ellipsoid, short-beaked : coma white. 



4. E. adenocaulon. 



1. Epilobium lineare INIu hi. Linear-leaved Willow-herb. (Man. 

 p. 656 ; I. F. /. 25J2.) In swamps, N. B. to B. C, Del., the Ind. Terr, 

 and Wyo. — Pennsylvania : Lackawanna ; Monroe ; Schuylkill : 

 Lancaster ; Bucks. 



2. Epilobium strictum Muhl. Downy or Soft Willow-herb. 

 (Man. p. 656; I. F. /. 35J3.) Bogs, Me. to Ont., Minn., Va. and lU. — 

 Pennsylvania : Lancaster ; Delaware ; Elk ; Crawford ; Erie. 



3. Epilobium coloratum Muhl. Purple-LEAVEd Willow-herb. 

 (Man. p. 656 ; 1. F./. 2yjs. ) In low grounds. Me. to Ont., Wis., S. Dak., 

 S. C. and Kans. — Pen?tsylvania : Monroe ; Lackawanna ; North- 

 ampton ; Bucks ; Philadelphia ; Delaware ; Chester ; Lancaster ; 

 Dauphin ; Franklin ; Huntingdon ; Erie ; Allegheny. 



4. Epilobium adenocaulon Haussk. Northern Willow-herb. 

 (Man. p. 656; I. F.y. 2^j6.) In moist grounds, X. B. to Ore., south to 

 Mass., Pa., Iowa, Utah and Calif. — Pen?isyli'ania : Monroe; Schuyl- 

 kill; Luzerne; Tioga; Delaware, Tmi^um. 



