CARYOPHYLLACEAE (PINK FAMILY) 383 



13. S. AQUATIC A (L.) Scop. PerenwmZ, glandular-pubcsccMit ; ?eai'es /arz/e, 

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

 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 curved, 

 membranaceous, opening at the summit by twice as many teeth as tliere were 

 styles, many-seeded. Seeds rough. (Name from /c^pas, a horn, alluding to the 

 shape of the pod.) 



Perennial. 



Petals much longer than the sepals \. C. arvenne. 



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. mfucosum. 

 Bracts scarious-margined ; petals (if present) naked . . . 4. C. semidecandrum. 

 Sepals oblong, merely acutish; petals (if present) naked . , .5. C. brachypodum. 

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



1. C. arv§nse L. (Field M.) Stems ascending or erect, tufted, downy 

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

 at the summit ; leaves linear or narrowly lanceolate ; petals ohcordate, maro 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. oblongifblium. (Torr.) HoUick & Britton. Usually taller, pubescent; 

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

 long as the calyx. (0. ohlongifoUum Torr.) — Rocky places, chiefly serpen- 

 tine, N. Y. to Minn., Col., and southw. Var. yillosum Ilollick & Britton. 

 Similar, but densely villous-pubescent, and the leaves lanceolate to ovate- 

 lanceolate. (Y Sir. velutinu7n Britton.) — Serpentine barrens, etc., e. Pa. ; also 

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



2. C. vulgItum L. (Common M.) Stems clammy-hairy, spreading (L5-4 

 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 much longer than the calyx. (C. 

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

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



3. C. visc6suM L. Hairy and rather clammy, nearly erect (1-2 dm. high); 

 leaves ovate to obovate or oblong-spatulate ; bracts herbaceous ; flowers sinaU, 

 at first in close clusters; pedicels even in fruit not longer than the very acute 

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

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

 and Pacific States. (Nat. from Eu.) 



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

 spicuously scarious-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 north westw. . j /•, - k 



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

 dip. high); cyme loose, many-flowered; leaves oblong-lanceolate, acute, the 

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



