188 XXIII. CARYOPHYLLACE^E. ARENAHIA. 



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. 



1. C. VULGATUM. Mouse-ear Chickweed. 



Hairy, pale green, csespitose; Ivs. attenuated at the base, ovate, or obo- 

 vate-obtuse ; fls. in subcapitate clusters ; sep. when young, longer than the pedi- 

 cels. (D Fields and waste grounds, Can. and U. S., flowering all summer. 

 Stems 6 12 7 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. VISCOSUM. (and C. semidecandrum. Linn.*) Sticky Chickweed. 

 Hairy, viscid, spreading; Ivs. oblong-lanceolate, rather acute; fls. in 



loose cymes ; sep. scarious and white on the margin and apex, shorter than the 

 pedicels. 1\. Fields and waste grounds, U. S. and Can. Plant more deeply 

 green than the last. Stems many, assurgent, dichotomously-cymose. Leaves 

 5 9" long, i as wide, radical ones subspatulate. Flowers white, in diffuse 

 cymes. Petals hardly as long as the sepals, obovate, bifid. Jn. Aug. 

 0. semidecandrum. T. & G. Stamens 5. Mass, to la. ! 

 ** Petals much longer than the calyx. 



3. C. ARVENSE. (C. tenuifolium. Ph.) Field Chickweed. 

 Pubescent, somewhat caespitose ; Ivs. linear-lanceolate, acute, often longer 



than the intern odes ; cyme on a 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. OBLONGIFOLIUM. Torr. (C. villosum. Muhl.} 



Villose, viscid above ; st. erect or declined ; Ivs. oblong-lanceolate, most- 

 ly obtuse, and shorter than the internodes ; fls. numerous, in a spreading cyme ; 

 pet. twice as long as the sepals; cap. about twice as long as the calyx. 1\. 

 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 ; Ivs. lanceolate, 

 narrow, shorter than the internodes ; fls. many, diffusely cymose, on long, 

 filiform, nodding pedicels ; pet. nearly twice as long as the calyx. (D Low 

 grounds, Vt. to 111. ! and La. Pale green and 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. Fls. terminal. 

 Sty. rarely 2 or 4. 



1. A. SQARROSA. Michx. 



Caespitose ; si. few-flowered ; lower Ivs. squarrose-imbricate, crowded, 

 upper ones few, all subulate, channeled, smooth; pet. obovate, three times longer 

 than the obtuse, veinless sepals. 1|_ In sandy barrens, N. Y. Bobbins, to Ga. 

 Stems 6 10' high, pubescent, much divided at base into simple branches. 

 Leaves about J' 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 ; Ivs. subulate-linear, erect ; 

 pet. much longer than the calyx ; sep. ovate-lanceolate, acute, 3- veined ; cymes 



