: 





CARYOPHYLLACEAE (PINK FAMILY) 383 



13. S. AQUATIC A (L.) Scop. Perennial, glandular-pubescent ; leaves large, 

 ovate, acute, cordate, the lower petiolate ; petals much exceeding the glandular- 

 pubescent sepals. (Alsine Britton.) Occasional on waste land, in parks, etc., 

 in the Eastern States, w. Que. and Ont. (Adv. from Eu.) 



6. CERASTIUM L. MOUSE-EAR CHICKWEED 



Sepals 5, rarely 4. Petals as many, 2-lobed. or -cleft, rarely entire, often 

 wanting in some of the flowers. Stamens 10 or fewer. Styles mostly 5, rarely 

 4 or 3, opposite the sepals. Pod 1-celled, usually elongated, -often 1 Curved, 

 membranaceous, opening at the summit by twice as njany teeth as thete were 

 styles, many-seeded. Seeds rough. (Name from Ktpas, a horn, alluding^ the 

 shape of the pod.) 



Perennial. [jj 



Petals much longer than the sepals 1, C. arvense. ^ T 



Petals equaling or shorter than the sepals or wanting . . . . 2. C. vulgatum:' ' 

 Annual. 



Pedicels 4-10 mm. long. 

 Sepals lanceolate, attenuate. 



Bracts not scarious-margined ; petals (if present) ciliolate at base . 3. C. mseosum. 



Bracts scarious-margined ; petals (if present) naked . . , 4. C. 8einidecan$rum. 



Sepals oblong, merely acutish ; petals (if present") naked . . . f>. f. l'fn'hypddwm. 



Pedicels, at least the lower ones, 1.5-5 cm. long . . . ; . r * 6- C. nutans. 



1. C. arv6nse L. (FIELD M.) Stems ascending or erect, tufted, downy 

 or nearly smooth, slender (1-2 dm. high), naked and few^-several-flowered 

 at the summit ; leaves linear or narrowly lanceolate ; petals obcordate, more than 

 twice the length of the calyx ; pods (about 1 cm. long) one third to two thirds 

 longer than the calyx. Dry or rocky places, Lab. to Alaska, s. to Del., Pa., 

 Ind., Mich., Minn., etc., and along the mts. to Ga. May-July. (Eu.) 



Var. oblongifdlium (Torr.) Hollick & 'Britten. Usually taller, pubescent; 

 leaves narrowly to broadly oblong or oblong-lanceolate ; pod about twice as 

 long as the calyx. (C. oblongifolmm Torr.) Rocky places, -chiefly (Serpen- 

 tine, N. Y. to Minn., Col., and south w. Var. viLi,6suM Hollick & Britton. 

 Similar, but densely mllous-pubescent^ ; and the leaves lanceqlate to ovate- 

 lanceolate. (Var. velutinum Britton",.) -^- Serpentine barrens, etc., e. Pa. ; also 

 reported at Hamilton, Ont. (Dickson according to J. M. Macoun). 



2. C. vuLcAxuM L. (COMMON M.) Stems clammy-hairy, spreading (1.5-4 

 dm. long); leaves chiefly oblong (varying to spatulate and oVate-lanceolate) ; 

 upper bracts nearly herbaceous ; flowers at first clustered ; -sepals 4-6 mm. long, 

 obtusish ; pedicels longer, the fruiting- ones- qtucii longer than->the -calyx. (C. 

 viscosum of the Linnean herbarium ; C. triviale Link.) Fields, dooryards, 

 etc.; common. May-July. (Nat. from Eu.) 



3. C. VISCOSUM L. Hairy and rather clammy, nearly^ erect ^1-2 dm. /high); 

 eaves ovate to obovate or oblong-spatulate ; bracts herbaceous,; flowers smalt,' 



at first in close clusters; pedicels even in fruit Hot longer thw the very acute 

 sepals ; petals shorter than the calyx. (C. vulgatum of the Lluhean herbarium; 

 C. glomeratum Thuill.) Grassy places, chiefly in the miditle Atlantic, Gulf, 

 and Pacific States. (Nat. from Eu.) 



4. C. SEMIDKCAXDRUM L. Similar to the preceding but smaller ; bracts con- 

 spicuously scario its-margined ; pedicels in fruit slightly exceeding the sepals. 



Dry soil, locally established, Nantucket (Churchill} and Ct. (Graves} to 

 Va. (Adv. from Eu.) 



5. C. brachypodum (Engelm.) Robinson. Pale green, viscid-pubescent; 

 leaves oblong ; flowers in a dense or sometimes open dichotomous cyme ; pedicels 

 about equaling the capsules; these usually 2-3 times as long as the sepals. 

 (C. nutans, var. Engelm.) Near St. Louis, Mo. (Engelmann} to La., westw. 

 and northwestw. 



6. C. nutans Raf. Stems erect, slender, grooved, diffusely branched (1.5-5 

 rim. high); cyme loose, many-flowered; leaves oblong-lanceolate, acute, tlie 

 lowest spatulate ; peduncles elongated, more or less hooked ; petals (sometimes 



