ROBINSON. — ALSINE.E. 311 



S. gracilis. Low, glabrous, 2-6 inches in height, diffusely 

 branched : leaves ^-1 inch in length : stipules deltoid : flowers small, 

 subglobose, 1-1 £ lines in diameter, not closely aggregated; pedicels 

 2-3 lines long : sepals elliptic ovate, a line or less in length, thick 

 in the middle but scarious-margined : valves of the capsule a third to a 

 half longer than the sepals ; seeds angled, somewhat triangular in out- 

 line, finely but distinctly roughened. — Lepigonum gracile, Wats. Proc. 

 Am. Acad. xvii. 367. 7issa gracilis, Brittou, Bull. Torr. Club, xvi. 

 128. — Sandy ground, dried ponds, etc. Dallas, Texas, Revere/ton, 

 to S. California, Parry, Nevius, Orcutt. 



S. tenuis. Dichotomously much-branched, becoming 8-10 inches 

 in height, somewhat glandular-puberulent or pubescent above : leaves 

 6-10 lines long : the very numerous flowers somewhat larger than in 

 the last and inclined to be closely grouped; capsule twice the length 

 of the ovate-oblong sepals. — Lepigonum tenue, Greene, Pittonia, i. 

 63. Tissa tenuis, Greene ex Britton, Bull. Torr. Club, xvi. 128. 

 T. diandra?, K. Brandegee, Zoe, iv. 84. — California near Alameda, 

 Greene, Mt. Eden and Tulare, Mrs. Brandegee. The affinities of 

 this species are almost equally with S. salina, Presl, and S. diandra, 

 Boiss., and in a large series of specimens it may not be possible to 

 distinguish it sharply from either. The flowers, however, are more 

 numerous and smaller and the corolla less developed than in the former ; 

 the habit also is much more branching. From S. diandra it differs in 

 the usually much shorter pedicels of the closely aggregated and at 

 first subcurymboseiy arranged flowers. 



* * * Annuals or biennials, more decidedly fleshy, usually of maritime or 

 saline habitat : flowers small or of medium size: corolla more or less con- 

 spicuous, white or pink, less frequently pink-purple : stipules ovate or 

 deltoid. 



S. salina, Presl. Commonly although not always pubescent: 

 leaves often fascicled in the axils : sepals ovate to oblong-lanceolate, 

 narrowed upward although obtuse at the summit, 2-2 i lines long : 

 petals pink : capsule equalling or a third to a half longer than the 

 calyx : seeds turgid, obovate, usually roughened, less frequently nearly 

 or quite smooth (var. leiospernnim, N. E. Brown, Eng. Bot. Suppl.). 

 — Fl. Cechica, 95; Gray, Man. ed. 5, 95; Warming, Bot. Foren. 

 Festkr. 1890, 238, fig. 20. S. Canadensis, Don, Mill. Diet. i. 426. 

 S. rubra, var. marina, Gray, Man. ed. 1, 64. S. media, and var. 

 macrocarpa, Gray, Man. ed. 5, 95. Arenaria rubra, var. marina, L. 

 Spec. 423. A. marina, Bigel. Fl. Bost. 109; Roth in Ilornem. Fl. 

 Dan. xiii. t. 2231. Buda marina, Dumort. Fl. Belg. 110. LepigO' 



