158 Caryophvllaceae 
B. Annual; stems decumbent, several-flowered, the lower flowers lateral: flowers 
I—3 mm. wide. W. C. E. : 
S. occidentalis Wats. 
BB. Perennial; stems either erect or else with a single terminal flower; flowers 3—5 
mm. wide. 
C. Stems decumbent, filiform, |-flowered, the flower terminal; pedicels at length 
nodding. C. E. S. saginoides Brit. 
CC. Stems erect, somewhat fleshy, several-flowered, the lower flowers lateral; 
pedicels remaining straight. W. 
S. crassicaulis Wats. 
AA. Herbage glandular-puberulent; annual. W. 
S. ciliata Pip. (Hairy Pearlwort) 
ARENARIA SANDWORT 
Annual or perennial, mostly low, often tufted. Leaves sessile in most species, 
often rigid, ovate to subulate; stipules none. Flowers small, white, solitary or in cymes; 
cymes paniculate or head-like. Sepals 4—5. Petals rarely none, entire to 2-lobed. 
Stamens twice as many as the sepals. Styles 2-5, 3 in most, opposite the sepals. 
Capsule globose to oblong, opening by as many valves as there are styles; valves entire 
or 2-cleft. Seeeds few to many, laterally compressed or reniform-globose. (L. arena= 
sand; refering to the habitat of many species.) 
A. Disk of the receptacle conspicuous, 8—10-lobed; seed without strophiole; petals 
present or none; leaves oblong or wider, not rigid. 
B. Leaves entire; calyx-lobes about 7 mm. long, about the same length as the petals; 
along sandy seashores. W. (Ammodenia peploides. ) 
A. peploides L. (Seashore Sandwort) 
BB. Leaves crenulate; calyx-lobes about 2 mm. long, twice as long as the petals; 
in salt marshes. W. (Ammodenia peploides major; Ammodenia sitchensis. ) 
A. sitchensis Dietr. 
AA. Disk of the receptacle none. 
C. Seed with strophiole; leaves soft, linear to ovate; petals always present. 
D. Stem terete; leaves oblong or oval, widest about the middle; sepals obtusish, 
shorter than the petals. W.E. (Moehringia lateriflora.) 
A. lateriflora L. (Blunt Sandwort) 
DD. Stem angled; leaves lanceolate, widest below the middle: sepals acuminate, 
longer than the petals.’ W. C. E. (Moehringia macrophylla. ) ; 
A. macrophylla Hook. (Large-leaved Sandwort) 
CC. Seed without strophiole; leaves more or less rigid and subulate; petals some- 
times none. 
E. Leaves elliptic-lanceolate or ovate. 
F. Perennial; leaves 8—12 mm. or more long, crenulate: petals about as long 
as the sepals. W. C. 
A. physodes Fisch. 
FF. Annual; leaves 4—8 mm. long, entire; petals 2/3 as long as the sepals. 
G. Leaves ovate; capsule flask-shaped, firm in texture. W. 
A. serpyllifolia L. (Thyme-leaved Sandwort) 
GG. Leaves lanceolate; capsule subcylindric, papery in texture. W. (A. 
serpyllifolia tenuor.) 
A. leptoclados Guss. 
EE. Leaves linear. 
H. Petals: equaling or exceeding the sepals. 
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