124 DECANDRIA TRIGYNIA. Arenaria. 



shorter than the calyx. E. B. 1074. C. G. £8. 

 Alsme fontana. G. E. 613. 



Rivulets, ditches, springs. 



An. June. 



Herb slendei", smooth, pale, somewhat glaucous, green. Stems 



branched, four-angled, leafy. Ls. veins many, parallel. Fl. 



two or three together. Bract, membranous, spear-shaped. Pet. 



very small, segm. narrow, greenish-white. Styles from three, 



four, to five. 

 Discrim. peculiar inflorescence, short pet. Form and structure of 



the Ls. Pet. segm. straddUng, deeply divided. 



ARENA'RIA. Sandwort. 



* Stipulas none. 



A. trinervis. Plantain-leaved Chickweed, or S. Leaves 

 egg-shaped, acute, stalked, ribbed. Calyx obscurely 

 three-ribbed, with a rough keel. E. B. 1483. C. 4. 

 31. A. trinervia. Sb. 141. 



Shady, bushy places. 



An. June. 



Stems upright, one f., weak, much branched, round, downy. Ls. 

 opposite, sometimes with five ribs. Fl. small, white : stalks 

 longish, solitary, from the forks of the stem, and summits of the 

 branches. Cal. longer than the pet. Ls. upper ones, nearly 

 stalkless. 



Discrim. From St. media by its small undivided pet. and tluree- 

 ribbed Is. 



A. serpyUifolia. Thyme-leaved S. Leaves egg-shaped, 

 nearly stalkless, rough. Calyx hairy ; three outermost 

 of its leaves five-ribbed. E. B. 923. C. 4. 32. 

 Alsine petrsea. G. E. 612. 



Walls, dry, sandy ground. 



An. June. 



Stems several, three or four inches, spreading, a little branched, 

 leafy, stiff, slender, forked upwards. Ls. small, entire, thyme- 

 like, slightly ribbed. Fl.-stalks erect, pet. white, shorter than 

 the ccd. Cal. -ribs a discriminating mark in this genus. 



A. tenuifolia. Fine-leaved S. Leaves awl-shaped, 

 pointed. Stem panicled at the extremities. Capsules 

 erect, of three valves. Petals spear-shaped, shorter 

 than the calyx. E. B. 219. 



Dry, barren, sandy fields.** Rewly Abbey. Charlbmy Stone 

 Quarries. Cornfields near Xettlebed. Sb. Cheney Lane. B.i'. 

 An. June. 



