20 CAEYOPHYLLACEAE. 



pie or some branched; leaves opposite, lanceolate or oblong-lanceolate, 

 acuminate; petals white, cnneate, 2-cleft or 2-lobed. Low prairies and 

 woods; June-July; infrequent; Winneshiek, Allamakee, Fayette, and John- 

 son counties. (8, alba Muhl.) 



S. cucubalus Wibel. Blmhtcr campion. Glaucous; stem J-^-l 1 ^ feet high, 

 branched from the base, usually glabrous; flowers numerous, in leafless 

 cymes; calyx globular, much inflated. Reported from Ames, Story county. 

 (S. vulgaris (Moench) Garcke.) 



* * Annuals; calyx not inflated. 



S. antirrhina L. Sleepy Ctttchfly. Stein 1-3 feet high, pubescent or 

 glabrous, simple or branched, slender, a portion of the internodes glutinous; 

 leaves linear or narrowly lanceolate, sessile, the upper passing into bracts, 

 the lower spatulate, tapering into a petiole; flowers small, paniculate, pink, 

 transient in the sunshine: calyx ovoid, petals obcordate. Dry soil; June- 

 September; common. 



S. noetiflora L. Stem 1-3 feet high, viscid-hairy; lower leaves large, 

 spatulate or oblanceolate, narrowed into a broad petiole, upper leaves lanceo- 

 late, acute; flowers fragrant, opening in the evening, closing next morning; 

 calyx tubular, becoming ovoid, teeth linear; petals 2-parted. Waste places; 

 July-September; infrequent; Fayette, Scott, Story, Emmet, Lyon, Calhoun, 

 and Fremont counties. 



LYCHNIS L. Ours a biennial herb. Petals 5, narrowly clawed, 2-cleft. 

 Stamens 10. Styles 5, opposite the calyx lobes. Ovary 1-celled, many-ovuled. 

 Capsule dehiscing by 10 or fewer apical teeth. 



L. vespertina Sibth. Plant viscid pubescent, often dioecious, much the 

 aspect of Silene . noetiflora L.; stem 1-2 feet high, branched; leaves ovate- 

 oblong or lanceolate, acute, lower with margined petioles; flowers paniculate, 

 white or pinkish, opening at dusk and closing next morning; calyx tubular, 

 ovoid in fruit, petals crowned. Waste places; June-August; lare; reported 

 trom Winneshiek, Story, and Montgomery counties. (L. idha Mill.) 



AGROSTEMMA L. Annual pubescent herb, with linear-lanceolate sessile 

 leaves, and large red flowers. Calyx oblong, 5-lobed, 10-ribbed, not inflated. 

 Petals 5, shorter than the calyx lobes, not appendaged. Styles 5, alternate 

 with calyx lobes. Capsule 1-celled. 



A. githago L. Corn Cockle. Stem 1-3 feet high, mostly simple; flowers 

 solitary, on long axillary peduncles; petals obovat-e-cuneate, slightly ernar- 

 ginate. Waste places; July-September; infrequent, but widely distributed. 

 (Lychnis githagu Lam. of Gray's Manual.) 



ARENARIA L. Ours perennials, with sessile leaves, and small white 

 flowers. Sepals and petals 4 or 5. Stamens 10. Styles 2. Pod 1-celled, 

 dehiscing at the apex by 3 or valves. 



A. michauxii Hook. f. Stems 6-14 inches high, tufted, erect or nearly so; 

 leaves filiform or subulate, 1-ribbed; flowers cymose, bracted, parts in 5's 

 sepals ovate, pointed, 3-ribbed, slightly shorter than the ovoid pod, and half 

 the length of the petals. Dry prairies; May-July; infrequent; Fayette 

 county, reported from Clinton county. [A. stricta Mx.) 



A. lateriflora L. Steins 4-12 inches high, erect or ascending, mostly sim- 

 ple, finely pubescent; leaves thin, oval or oblong, obtuse, margin and nerves 

 ciliate; flowers solitary or in few-flowered lateral or terminal cymes, white, 

 parts in 4's or 5's; sepals oblong, obtuse or acute, half the length of the 

 petioles; ovary at first 3-celled; capsule ovoid, about twice the length of the 



