Cerastium semidecandrum L.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Viscid-pubescent annual 0.5–2 dm; lvs relatively small, mostly 0.5–1(1.5) cm, the basal oblanceolate, the cauline ovate to broadly elliptic; infl often compact as in C. viscosum, varying to moderately open and dichasial, the pedicels to a little longer than the sep, usually deflexed in fr; bracts conspicuously scarious-margined and -tipped, the distal portion of the upper ones generally wholly scarious for ca 1 mm or more; sep 3–5 mm, lanceolate, acute, stipitate-glandular, with few or no eglandular hairs, scarious-margined; pet shorter than the sep, only shallowly notched, generally to a depth of less than 0.5 mm; stamens 5 or sometimes 10; capsule 4.5–7 mm, less than twice as long as the sep; seeds smooth or nearly so; 2n=36. Native of Eurasia, now intr. as a weed in much of our range but not so ubiquitous as C. viscosum.