GENUS 5. 



CHICKWEED FAMILY. 



2. Arenaria leptoclados Reichenb. Slender 

 Sand wort. Fig. 1778. 



Arenaria leptoclados Reichenb. ; Guss. Fl. Sic. Syn. 

 2 : 284. 1844. 



Annual, tufted, much branched, roughish- 

 puberulent, resembling Arenaria serpyllifolia L. 

 Leaves lanceolate or ovate-lanceolate, \\"-2\" 

 long, about one-half as wide as long, acute or 

 acuminate; bracts similar to the leaves, but usu- 

 ally much smaller ; sepals lanceolate, acumi- 

 nate, narrowly scarious-margined ; petals oblong, 

 about half as long as the sepals ; capsule oblong 

 or subcylindric, equalling the calyx or a little 

 longer. 



Dry soil, Maine to Michigan and westward. Ad- 

 ventive from Europe. May-July. 



3. Arenaria ciliata L. Fringed Sand- 

 wort Fig. 1779. 



Arenaria ciliata L. Sp. PI. 425. 1753. 



Perennial, tufted, glandular-puberulent, stems 

 very slender, creeping or ascending, pubescent 

 in lines, i'-s' long, or the flowering branches 

 erect. Leaves ovate or oblong, obtuse or acute 

 at the apex, sessile or very nearly so, i"-3" 

 long, ciliate or glabrous; peduncles filiform, 

 erect, mostly i-flowered; flowers about 3" 

 broad; sepals ovate or oblong, obtuse, nerveless 

 or faintly i-nerved, about as long as the petals; 

 capsule oblong, twice as long as the calyx, its 

 3 valves deeply 2-cleft; seeds slightly roughened. 



Quebec to Greenland. Also in arctic and alpine 

 Europe. The American plant is referred by Dr. 

 B. L. Robinson to the var. humifusa Hornem. 

 having glabrous leaves and nerveless sepals so far as 

 observed, and may be specifically distinct from the 

 European. In Europe the species has been separated 

 into several varieties. Summer. 



4. Arenaria Hookeri Nutt. Hooker's 

 Sand wort. Fig. 1780. 



Arenaria Hookeri Nutt.; T. & G. Fl. N. A. i : 178. 

 1838. 



Arenaria pinetorum A. Nelson, Bull. Torr. Club 26 : 

 350. 1899. 



Tufted from a deep woody root, 2'-$' high. 

 Leaves linear-subulate, rigid, very sharp-pointed, 

 densely impricated, glabrous, 6"-i2" long; flow- 

 ering stems short, finely and densely pubescent ; 

 bracts lanceolate-subulate, scarious-margined, the 

 margins ciliolate; cyme dense, 8"-i8" broad, its 

 rays short and pubescent ; sepals lanceolate- 

 subulate, pubescent, shorter than the similar 

 bracts and about one-half the length of the 

 petals; capsule not seen. 



In dry or rocky soil, South Dakota, Nebraska and 

 Colorado to Wyoming and Montana. June-Aug. 



