VOL. II.] 



PINK FAMILY. 



1. A. serpyllifolia. 



2. A. cilia ta. 



3. A. Hookeri. 



4. A. Fendleri* 



5. A, biflora. 



6. A. verna. 



7. A. Caroliniana. 



Valves of the capsule 2-cleft or 2-toothed, sometimes appearing as if double the number of the styles. 

 Leaves ovate or oblong. 



Sepals acuminate; annual herb of waste places. 

 Sepals obtuse or scarcely acute; perennial; arctic. 

 Leaves subulate or setaceous. 



Cymes very dense; stems i'-4/ tall. 

 Cymes loose; stems 4' '-15' tall. 



Valves of the capsule entire (Genus ALSIXE Wahl). 

 Leaves rigid, subulate or setaceous. 



Arctic or alpine, densely tufted, i'~3' high. 

 Flowers 5" -8" broad. 

 Flowers 2" -3" broad. 



Neither arctic nor alpine, tufted but diffuse, 4"-i6" high. 

 Leaves densely imbricated; pine barren species. 

 Leaves fascicled in the axils. 



Sepals ovate or ovate-lanceolate, 2" long; plant bright green. 8. A. stricta. 

 Sepals narrowly lanceolate, long-acuminate, 2]4" long; plant pale green. 



9. A. Texana. 

 Leaves soft, herbaceous; narrowly linear or filiform. 



Sepals prominently ribbed; southern. 10. A. patula. 



Sepals not ribbed; alpine and northern. n. A. Groenlandica. 



i. Arenaria serpyllifolia L,. Thyme- 

 leaved Sandwort. (Fig. 1499.) 



Arenaria serpyllifolia L. Sp. PI. 423. 1753. 



Annual, slender, slightly downy-pubescent, 

 widely branched and diffuse, 2 / -S' high. Leaves 

 ovate, 2 // -4 // long. i^ // -2 // wide, acute; pedi- 

 cels slender, 2 // -6 // long; bracts ovate, resem- 

 bling the leaves; flowers i" broad or less, very 

 numerous in cymose panicles; sepals ovate, i^" 

 long, acute or mucronate, 3~5-nerved, scarious- 

 margined; petals obovate or oblong, usually 

 shorter; capsule ovoid, slightly shorter than or 

 equalling the calyx, dehiscent by 6 short apical 

 valves; seeds rough. 



In dry or rocky places, common throughout east- 

 ern North America, extending across the continent. 

 Naturalized from Europe. Native also of northern 

 Asia, and widely distributed as a weed. May-Aug. 



2. Arenaria ciliata I,. Fringed Sandwort. (Fig. 1500.) 



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



Perennial, tufted, glaudular-puberuleut, 

 stems very slender, creeping or ascending, 

 pubescent in lines, i / -5 / long, or the flow- 

 ering branches erect. Leaves ovate or ob- 

 long, 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; cap- 

 sule 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 re- 

 ferred by Dr. B. L- Robinson to the var. hu- 

 m if lisa 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. 



