128 



Hab. In dry, especially sandy soil along both the Atlantic 

 and Pacific coasts, not seen west of the Alleghanies nor east 

 of California, and generally appearing as if introduced. Indeed I 

 have not met with evidence that it is really indigenous in East 

 America, and from its being so common a weed in Europe, our 

 plant may very likely be of exotic origin. 



4. TiSSA DIANDRA (Guss.) {Arcnaria diaiidra, Guss. El. 

 Sic. Prodr. i, 515 (1827); Arenaria salsiiginea, Bunge in Ledeb. 

 El. Alt. ii. 163 (1829); Lepigoniim salsiigineum, Kindb. 1. c 42 

 and Syn. 7). 



Spreading or bushy branched from the base ; stipules ovate, 

 acute ; peduncles leafless or nearly so ; plant glandular pubescent. 



Hab. Galveston, Texas (Lindheimer) ; Rio Brazos, Texas 

 (Drummond, 97 in Herb. Gray.) ; Sierra Valley, Gal. (Lemmon, 

 1874, doubtfully referred to this species); sandy bank of the 

 Columbia River, W. Klickatat Co., Washington (Suksdorf, 176); 

 also collected by Mr. Henderson in the same region in 1885. Our 

 plant agrees very nearly with authentic specimens from Arabia. 

 Its specific separation from T. rubra is open to question. 



t t Petals none. 



5. TiSSA GRACILIS (S. Wats.) i^Lcpigomim gracile, S. Wats. 

 Proc. Amer. Acad. xvii. 367 (1882). 



Capsules 2-4 mm. long, slightly exceeding the calyx ; seeds 

 tuberculate ; plants small and delicate, 4-8 cm. high. 



Hab. Los Angeles, Cal. (Parry, No. 15, 1881); Otay, San 

 Diego Co. (Orcutt, 1201) ; wet sands near Dallas, Texas (Rever- 

 chon in Curtiss, No. 333* distributed as S. Mexicana, Hemsl.) 



6. TiSSA TENUIS, Greene in litt. {Lepigontim teime, Greene, 

 Pittonia, i. 6^ (1887). 



Capsules 6-8 mm. long, twice the length of the calyx ; seeds 

 smooth, plants much larger, and more branched than in the last. 



This fine species may, perhaps, better be grouped with Nos. 

 I and 2, as its habitat appears to be near the sea, if not, indeed 

 within its influence. 



Hab. Alameda, Cal. (Greene) ; Santa Barbara (Rothrock, 

 154); Santa Monica (J. C. Nevin). 



