CARYOPHYLLACEAE (PINK FAMILY) 383 



13. S. AQUATICA (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 curved, 

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

 styles, many-seeded. Seeds rough. (Name from ictpas, a horn, alluding to the 

 shape of the pod.) 



Perennial. 

 Petals much longer than the sepals .... ... 1. (7. arvense. 



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. viscosum. 

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

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

 Pedicels, at least the lower ones, 1.5-5 cm. long 8. C. nutans. 



1. C. arvSnse 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. oblongif61ium (Torr.) Hollick & Britton. Usually taller, pubescent; 

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

 long as the calyx. (<7. oblongifolium Torr.) Rocky places, chiefly serpen- 

 tine, N. Y. to Minn., Col., and south w. Var. VILLOSUM Hollick & Britton. 

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

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

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



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

 dm. long); leaves chiefly oblong (varying to spatulate arid 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 small, 

 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 northwestw. 



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

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

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



