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..
Plants 1 1/2°-3° high, light green. Leaves basal, several; blades about one-third the length of the plant, about i" wide, sometimes involute; scapes grooved: inflorescence 1'~4' long, many-flowered, the branches ascending; flowers scattered, rather distant; perianth straw-colored, 1 1/2"-2" long, its parts nearly equal, lanceolate-subulate, slenderly acute or acuminate, appressed or erect, the petals margined to the apex: stamens 6, half as long as the perianth; anthers much shorter than the filaments; capsule oblong or rarely ovoid-oblong, about as long as the perianth, obtuse or barely apiculate: seeds oblong, 1/5"-1/4" long.
Tufted, 6'-16' high; leaves usually less than one-third the height of the plant; inflorescence longer than its lowest leaf or only slightly exceeded by it, 10"-4' high, the flowers secund on the usually somewhat incurved branches; perianth-parts 1 1/4"-1 3/4" long, equalling or barely exceeding the capsule and appressed to it for about two-thirds their length, often reddish above; stamens 6, about one-half as long as the perianth; capsule narrowly ovoid, 3-sided above the middle with straight sides and a truncate apex, completely 3-celled, the placentae meeting in the axis; seed i"-i" long, narrowly oblong to ovoid, obliquely tipped, with 12-16 longitudinal rows of areolae two or three times broader than long.
In dry soil, Maine and Vermont to Pennsylvania, North Carolina, Illinois and Missouri.
Juncus Vaseyi Engelm. Trans. St. Louis Acad. 2: 448. 1866.
Stems erect, tufted, 1°-2 1/2° high, 3/4" in diameter or less; basal leaves with minutely auriculate sheaths, the uppermost bearing a terete channeled blade, half to three-fourths as long as the stem; stem-leaves none; inflorescence 1 2/3' in height or less, 4-40-flowered, the low est bract usually not exceeding the inflorescence; perianth 1 1/2"-2" long, the parts subulate-lanceolate, with hyaline margins, the inner slightly shorter; stamens 6, about two-thirds as long as the perianth; anthers shorter than the filaments; style almost wanting; stigmas short; capsule slightly exceeding the perianth, narrowly oblong, obtuse or truncate, with a short tip, 3-celled; seed long-tailed, with a linear-oblong oblique body about 1/4" long, 20-24-ribbed, the intervening spaces with faint transverse markings.
New Brunswick to Maine, Ontario, Michigan, Illinois and Iowa.