286 PROCEEDINGS OF THE AMERICAN ACADEMY. 



lanceolatum, Michx. Fl. i. 275. Micropetalon lanceolatum, Pers. 

 Syn. i. 509. Arenaria calycantha, Lecleb. Mem. Acad. Petr. v. 534. 

 A. lateriflora, Darliugt. Florula Cest. 54. — New England to New 

 Jersey; Mendocino Co., Calif., and northward; flowering in mid 

 summer; frequent. 



Var. corollina, Fenzl, 1. c. i. 382. Taller : inflorescence spread- 

 ing and more definitely terminal : bracts reduced, the uppermost more 

 or less scarious : petals usually present : seeds slightly roughened. — 

 S. brachypetala, Bong. Sitch. 126 ; Torr. & Gray, Fl. i. 186. S. alpes- 

 tris, Fries, Mant. i. 10, excl. var. S. Fenzlii, Regel, Ost-Sib. i. 399„ 

 S. borealis, var. alpestris, Gray, Man. ed. 5, 93. — Lake Superior, 

 Bobbins, to Oregon, Howell, and northward. (Europe and Asia.) 



S. crassifolia, Ehrh. Low, smooth: stems many, weak, 

 ascending or suberect, internodes short : leaves small, numerous, thick- 

 ish, oblong-lanceolate, acutish, 3-6 lines in length : sepals ovate- 

 lanceolate, acuminate, somewhat exceeded by the petals and capsule : 

 seeds distinctly roughened under a lens. — Beitr. iii. 60 ; Fenzl, 1. c. 

 i. 383 ; Chapm. Fl. ed. 2, 608 ; Wats. & Coulter in Gray, Man. ed. 6, 

 87, excl. Kentucky plant. S. gracilis, Richardson, Frankl. Journ. 

 738; Hook. Fl. Bor.-Am. i. 97; Torr. & Gray, Fl. i. 184. S. 

 borealis, var. (3, Hook. 1. c. i. 95. — Labrador, Martin, Allen, to 

 Illinois, Vasey, Hill; Montana, Canby, and northward. 



S. fontinalis. Glabrous, stems regularly and dichotomously 

 branched, 6-12 inches long: branches spreading: leaves spatulate- 

 linear, obtusish, spreading, 5-10 lines long: internodes elongated, 1-2 

 inches in length : peduncles solitary in the forks of the branches, 1-1^ 

 inches long, ascending : sepals 4-5, oblong, obtuse, 3-nerved : petals 

 none: stamens 4-8: styles 3-4, very short: capsule obtuse, not 

 exceeding the calyx. — S. crassifolia, Wats. Bibl. Index, 111 in 

 part ; Wats. & Coulter in Gray, Man. ed. 6, 87 in part. Sagina 

 fontinalis, Short & Peter, Transylv. Journ. Med. 28, 600 ; Torr. & 

 Gray, Fl. i. 177. Spergula fontinalis, Dietr. Syn. PI. ii. 1597. — 

 Cliffs of Kentucky River and Elkhorn Creek, Kentucky, Short fy 

 Peter; Nashville, Tenn., Gattinger ; April, May. This too little 

 known plant, of distinctly aquatic habit, merits further study with 

 more abundant material. It is certainly distinct from S. crassifolia, 

 Ehrh. 



S. humifusa, Rottb. Low, densely matted, smooth : stems 

 prostrate or ascending, angulate, shining : leaves elliptic-ovate or 

 oblong, acutish, 2-5 lines long, marcescent : peduncles axillary. 4-7 

 lines in length : sepals ovate-oblong, acute, narrowly margined : petals 



