June, 1913.] Caryophyllaceae of Ohio. 177 



12. Petals unappendaged; styles opposite, alternate with the leaf-like 

 calyx-teeth. Agrostemma. 



12. Petals often appendaged; styles alternate with them; calyx-teeth 



short. Lychnis. 



13. Petals appendaged at the base of the blade, calyx terete. Saponaria. 

 13. Petals not appendaged, calyx 5-arigled, enlarged in fruit. Vaccaria. 



Sagina L. 



Low, tufted, matted herbs with subulate leaves. Flowers 



white; petals 4 or 5, entire, emarginate, or none; sepals 4 or 5; 



stamens 4 or 5 or S or 10; styles of the same number, arranged 



alternately. 



1. Plant depressed-spreading; petals present. 5. procumbens. 

 1. Plant erect; petals minute or none. S. apetala. 



1. Sagina procumbens L. Procumbent Pearlwort. Annual 

 or perennial; branching, decumbent or spreading; smooth or some- 

 what downy-matted, >2 to 2}4 inches high; leaves linear, subulate, 

 connate at the base; flowers arranged on capillary peduncles 

 which are often reflexed in fruit; sepals and stamens 4 or rarely 

 5; petals sometimes absent. Lake, Gallia. 



2. Sagina apetala Ard. Small-flowered Pearlwort. Erect 

 or ascending, annual, glabrous, filiform, about 3>^ inches high 

 leaves linear-subulate, smooth or slightly ciliate, % inch long 

 flowers on long peduncles; petals none or four very minute ones 

 sepals 4, ovate or oval, obtuse. Lawrence County. 



Arenaria L. 



Tufted herbs with sessile leaves. Flowers white, in cymes, 

 heads, or rarely solitary; petals 5; sepals 5; stamens 10; styles 

 generally 3. 



1. Plant pubescent, leaves ovate-acute, cymes leafy. .4. serpyllifolia. 



1. Plant glabrous, leaves subulate. 2. 



2. Perennial; leaves in groups at the nodes or axils, rigid. A. michauxii. 

 2. Annual; leaves opposite, soft. A. patiila. 



1. Arenaria serpyllifolia L. Thyme-leaf Sandwort. An- 

 nual, somewhat pubescent, branched, o}4. to 14 inches high; 

 leaves ovate, acute ; flowers numerous, arranged in cymose panicles ; 

 sepals ovate, acute; petals obovate or oblong, usually shorter. 

 General in Ohio. 



2. Arenaria michauxii (Fenzl.) Hook. Rock Sandwort. 

 Perennial, tufted, glabrous, dark green, 7 to 15 inches high; leaves 

 subulate or filiform, 1 -ribbed arranged in fascicles in the axils, 

 }i inch long; calyx ovoid-oblong in fruit; sepals lanceolate or 

 ovate-lanceolate, acute, one half the length of the petals. Ottawa, 

 Erie, Cuyahoga, Clarke, Franklin. 



3. Arenaria patula Mx. Pitcher's Sandwort. Annual, glab- 

 rous, very slender, 8 to 10 inches high; leaves soft, linear-filiform, 

 ^ to 1 inch long; flowers in cymes, sepals lanceolate, acuminate, 

 about one-half the length of the emarginate petals. Montgomery- 

 County. 



