Class X. Order III. 181 



ARENARIA SERPYLLIFOLIA. L. Thyme leaved Arenaria. 



Stem dichotomoiis ; leaves ovate, acute, subciliate, 

 calyx acute ; petals shorter than the calyx. 



Stems numerous, procumbent, downy. Leaves often closely 

 sessile, very acute, about three nerved. Flowers axillary. Ca- 

 lyx leaves three nerved, acute. Road sides ; naturalized. June. 

 Annual. 



ARENARIA LATERIFLORA. L,. Side flowering Sandwort. 



Leaves ovate, obtuse ; peduncles lateral, two flow- 

 ered. L. 



A slender, delicate species, with white flowers. Stem erect, 

 with hairy veins, filiform, from four to ten inches high. Leaves 

 opposite, oval, smooth, nearly sessile. Peduncles or flowering 

 branches axillary, very slender, divided about half way, their 

 fork furnished with two minute leafets. Each part of the fork 

 bears a flower. In wet, shady places. June. Perennial. 



ARENARIA PEPLOIDES. L. Beach Arenaria. 



Stem dichotomous, fleshy, leaves ovate, acute, 

 fleshy. 



This plant grows on sandy beaches in various parts of the sea 

 coast, particularly at Plumb island, near Newburyport, where it 

 forms large crowded tufts resembling islets. Stems as large as 

 small quills, smooth, fleshy, pellucid, furrowed on opposite sides. 

 Leaves opposite, half clasping, ovate, entire, acute, fleshy, 

 smooth, the veins only discoverable by their transparency. 

 Branches few, sometimes dichotomous. Flowers axillary, nearly 

 sessile. Calyx erect, the segments fleshy, nerveless, subacute. 

 Petals white, membranous, spatulate. Stamens as long as the 

 calyx, anthers roundish. Germ ovate, styles short. A fifth part 

 of the fructification is wanting in some of the flowers. May, 

 June. Perennial. 



187. STELLARIA. 

 STELLARIA MEDIA. Sm. Chickweed. 



Leaves ovate, stems procumbent, with an alternate, 

 lateral, hairy line. Sin. 



