300 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 



H. gentianoides (L.) BSP. Orange Grass; Pineweed. — 

 {Sarothra gentianoides 111. Fl. ed. 2.) 



Dry soil; common in Sheffield, occasional elsewhere in the valley. 

 New Marlboro; Union Church, Mt. Washington (altitude 1670 feet). 



H. majus (Gray) Britton. — Wet ground, damp clearings and 

 sandy shores; frequent in the valley. 



H. mutilum L. — Roadside ditches and low ground; common. 



H. PERFORATUM L. CoMMON St. John's Wort. — Fields and road- 

 sides; common. 



H. punctatum Lam. — Moist thickets and damp places; common. 



H. virginicum L. Marsh St. John's Wort. — ( Triadenum 

 virginicum 111. Fl. ed. 2.) 



Borders of ponds and marshes; common. Altitude 2000 feet, 

 Hancock. 



ELATINACEAE. WATERWORT FAMILY. 

 ELATINE. Waterwort. 



E. minima (Nutt.) Fisch. & Meyer. — (E. americana Man. ed. 7 

 and 111. Fl. ed. 2; vid. Rhodbra, 19: 13, 1917.) 



Submersed in shallow water on sandy bottom, Onota Lake, Pitts- 

 field; emersed on muddy border of Goose Pond, Tyringham. 



CISTACEAE. ROCKROSE FAMILY. 



HELIANTHEMUM. Rockrose. 

 {Crocanthemum 111. Fl. ed. 2.) 



H. Bicknellii Fernald. — (//. majus Man. ed. 7; lid. Rhodora, 21: 

 36, 1919. C. majus 111. Fl. ed. 2.) 



Dry soil and ledges; occasional in the southern part of the valley. 

 On limestone, Monterey; New IVIarlboro; locally common on the 

 sand-plain, Sheffield. 



H. canadense (L.?) Michx. Frostweed. — (C. canadense 111. Fl. 

 ed. 2.) 



Open sandy soil and rocky ledges; occasional in the southern part 

 of the valley. On limestone, IMonterey ; on quartzite, Great Barring- 

 ton; locally common on the sand-plain, Sheffield. 



