MACLOSKIE I CARYOPHYLLACE^E. 393 



8. AMMODENIA Gmel. (Honkenya Ehrh.) 



Perennial, fleshy, maritime herbs with rather large, shining, decussate 

 leaves, and rather small, 4-5-merous, polygamous flowers, petals entire, 

 and stamens twice as many. Disk prominent, 8-io-lobed. Styles 3-5; 

 capsule globose, 3-5-valved. 



Species i, viz. : 



A. PEPLOIDES (L. sub Arenaria ; Wahl. sub Alsine}. Sea-purslane. 



With creeping rhizome, 4-angled stem, and yellowish-green leaves. 

 Seeds about 10, black. 



Seabeaches through the N. Temperate zone. S. Patagon. (J. B. 

 Hatcher.) 



(The form found in California is considered by some authors as a sep- 

 arate species, A. oblongifolia]. 



9. ARENARIA Linn. Sandwort. 



Generally tufted, with terminal cymose or capitate, often solitary, 

 5-merous, white flowers. Petals scarcely emarginate, rarely none. Sta- 

 mens 10. Styles usually fewer than the sepals. Capsules dehiscing by 

 teeth. Seeds reniform-globose. 



Species 150, extra-tropical. 



KEY TO THE SPECIES. 



A. Leaves 4-ranked, imbricated. dicranoides. 

 A2. Leaves opposite. 

 b. Flowers solitary. 



c. Leaves short, r<jugh. alsinoides. 



c2. Leaves acuminate, basi-attenuate, hairy. lanuginosa. 



c^. Leaves thickish, close, awned. Petals none. serf ens andina. 

 b2. Flowers few. 



c. Leaves lance-linear, broad in the middle. patagonica. 

 c2. Leaves oblong, obtuse, thickish. 



d. Petals short. Long creepers. serpens. 



d2. Petals exceeding sepals. Stems short. serpylloides. 



I. A. ALSINOIDES Willd. 



Stems diffuse, furrowed or quadrangular upward ; branches opposite 

 mostly and pubescent, the hairs uncinately reflexed. Leaves linear or 

 subulate, or broad, usually shorter than the internodes, puberulent, sea- 



