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POPULAR FIELD BOTANY. 
DECANDRIA. TRIGYNIA. 
THALAMIFLOREZ, CARYOPHYLULACE2. 
ARENARIA. (Sanpwort.) 
Generic Character. Calyx of five leaves. Petals five, un- 
divided. Seed-vessel with one cell and many seeds. 
These are small, insignificant plants growing on sandy 
soils. 
ARENARIA SerRPYLLIFOLIA. (Plate XIII. Fig. 50.) 
Thyme-leaved Sandwort. A small plant, found on walls 
and dry places. From two to six inches in length, erect, 
or procumbent, much branched. Leaves small, stiff, and 
not stalked. Flowers small, white, on short stalks, from 
the forkings of the upper part of the stem, or the axil of 
the leaves. 
ARENARIA TENUIFOLIA. Fine-leaved Sandwort. Stem 
much branched, generally divided into pairs. Leaves small, 
and narrow. Flower white, petals much shorter than the 
calyx; whole plant remarkably slender. It occurs in sandy 
fields and on walls, 
ARENARIA RUBRA. Purple Sandwort. This and the 
next differ from the two former, by each pair of leaves 
being accompanied by a shining sheath, called a stipule. 
