This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol1", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
About 1° high in erect tufts, not fibrose at base, pale light green and glaucous, not changing color when dry. Stems and leaves 1/2"-1" wide, mostly serrulate, the leaves thin, tapering-acute, over half the height of the stems; node only one, its erect leaf closely united-clasping below, subequal with the two short approximate peduncles; spathes erect, narrow, 8"-10" long, the bracts subequal, sharp-pointed; flowers rather small, deep violet-blue; capsules pale and thin-walled, somewhat obovoid, about 2" high, on suberect, slightly exserted margined pedicels.
In sandy soil, Montcalm Co., Mich. June.
S". atlanticum Bicknell, Bull. Torr. Club 23: 134. 1896. S. apiculatum Bicknell, Bull. Torr. Club 26: 300. 1899.
Glaucous-green, tufted, not drying black, the stem slender, rather narrowly 2-winged, very smooth-edged, sometimes 2° long, and reclining, terminating in two or three mostly subequal branches, often also with one or two lateral ones; peduncles slender and wiry, often- recurved and forming a distinct angle with the floral bracts. Leaves rarely over 1" wide, the basal ones usually much shorter than the stem; bracts nearly or quite equal, narrow, mostly somewhat scarious, often purplish; flowers 3"-6" long; capsules thick-walled, on generally erect pedicels 7"-10" long, oval, 1"-2" long and 3/4"-1 1/2' in diameter, sometimes apiculate; seeds oval, subglobose, 1/4"-1/2" in diameter, dark, faintly pitted or nearly smooth.