188 XXII CARYOPHYLLACE. “ARENARIA. 
10, sometimes 5 or 4, the alternate ones shorter; styles 5; capsule 
superior, cylindrical or roundish, 10-toothed ; seeds numerous. 
. * Petals scarcely longer than the calyx. 
al. C. vuteAtum. Mouse-ear Chickweed. 
‘Hairy, pale green, cespitose; vs. attenuated at the base, ovate, or obo- 
va e-obtuse; fis. in subcapitate clusters; sep. when young, longer than the pedi- 
cels.—@) Fields and waste grounds, Can. and U. §S., flowering all summer. 
Stems 6—12 long, ascending, mostly forked. Leaves 5—8” by 3—5”, mostly 
very obtuse, lower ones tapering to the base. Flowers in dense, terminal clus- 
ters, the terminal (central) one solitary, always the oldest. Sepals mostly green, 
a little shorter than the corolla. Petals white, appearing in 10 segments. 
2. C. viscésum. (and C. semidecandrum, Linn.) Sticky Chickweed. 
Hairy, viscid, spreading; dvs. oblong-lanceolate, rather acute; fis. in 
loose cymes; sep. scarious and white on the margin and apex, shorter than the 
pedicels.—2| Fields and waste grounds, U. 8. and Can. Plant more deeply ~ 
green than the last. Stems many, assurgent, dichotomously-cymose. Leaves 
5—9" long, }—} as wide, radical ones subspatulate. Flowers white, in diffuse 
cymes. Petals hardly as long as the sepals, obovate, bifid. Jn.—Aug. 
B. semidecandrum. T.&G. Stamens 5.—Mass. to Ia.! 
** Petals much longer than the calyx. 
3. C. aRVENSE. (C.tenuifolium. Ph.) Feld Chickweed. 
Pubescent, somewhat cespitose; dvs. linear-lanceolate, acute, often longer 
than the internodes; cyme ona long, terminal peduncle, few flowered; pet. 
more than twice longer than the calyx; cap. scarcely exceeding the sepals.— 
Rocky hills. Stems 4—10’ high, decumbent at base. Leaves 9—15” long, 1— 
2 wide. Flowers white, rather large. Capsule usually a little longer than 
the calyx. May—Aug. 
4. C. optoneiroutium. Torr. (C. villosum. Mul.) 
Villose, viscid above; st. erect or declined; dvs. oblong-lanceolate, most- 
ly obtuse, and shorter than the internodes; /ls. numerous, in a spreading cyme ; 
pet. twice as long as the sepals; cap. about twice as long as the calyx.—2 
Rocky places. Stems 6—10’ high, thick. Leaves 9—12” by 3—5”, tapering 
from base to an acute or obtuse apex. Flowers larger than either of the fore- 
going, white, in two or three-forked cymes. Apr.—Jn. 
5. C. nutans. Raf. 
Viscid and pubescent; st. weak, striate-sulcate, erect; dvs. lanceolate, 
narrow, shorter than the internodes; fis. many, diffusely cymose, on long, 
filiform, nodding pedicels; pet. nearly twice as long as the calyx.—@) Low 
grounds, Vt. to Ill.! and La. Pale greenand very clammy. Stems 8—15’ high, 
branched from the base. Leaves 1—2! long, } as wide. Flowers white. Cap- 
sules a little curved, nearly thrice longer than the calyx. May. 
3. ARENARIA. 
Lat. arena, sand ; in which most species grow. 
Sepals 5, spreading; petals 5, entire; stamens 10, rarely fewer ; 
styles 3; capsule 3-valved, 1-celled, many-seeded—Rs. terminal. 
Sty. rarely 2 or 4. 
1. A. sqarrésa. Michx. 
Cespitose ; st. few-flowered; lower lvs. squarrose-imbricate, crowded, 
wpper ones few, all subulate, channeled, smooth ; pet. obovate, three times longer 
than the obtuse, veinless sepals.—2| In sandy barrens, N. Y. Robbins, to Ga. 
Stems 6—10’ high, pubescent, much divided at base into simple branches. 
Leaves about 3’ long, obtuse, sessile. Flowers white, in small terminal cymes. 
Sepals green. Capsules obtuse. Apr.—Sept. 
2. A. stricta. Michx. Straight Sandwort. 
Glabrous, diffuse; st. branched from the base; vs. subulate-linear, erect ; 
pet, much longer than the calyx; sep. ovate-lanceolate, acute, 3-veined; cymes 
