This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol2", 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..
Perennial by a woody root, pale green, glandular-pubescent above; stems tufted, erect, very slender, usually several times forked, 4-15' tall, the internodes 1'-2' long. Lower leaves subulate or setaceous, glabrous or minutely ciliate. 1'-4' long, about i" wide, the upper gradually smaller and somewhat connate at the base; cyme loose, its forks filiform, several-flowered; pedicels very glandular, 3"-12" long; flowers 4"-6" broad; sepals linear-lanceolate, acuminate, scarious-margined, nearly as long as the obovate petals; capsule narrowly oblong, rather shorter than the sepals, 3-valved, the valves 2-toothed.
In dry, usually rocky soil Nebraska and Wyoming to Utah, south to New Mexico and Arizona. June-Aug.
Arenaria arctica Stev.; DC. Prodr. 1: 404. 1824.
Perennial, stem woody below, tufted, glandular-pubescent, 1"-2' high. Leaves linear or linear-lanceolate, sessile and sheathing, densely imbricated, somewhat broadest at the base, 3"-4" long, semiterete, obtuse, glabrous, ciliate or glandular-pubescent, generally falcate, strongly keeled by the midvein; peduncles slender, terminal, 1-2-flowered; flowers 5"-8" broad; sepals linear-oblong, 3-nerved, obtusish; petals obovate, twice as long as the calyx; capsule slightly longer than the sepals; seeds smooth.
Greenland and Labrador to Quebec, west through Arctic America to Alaska, south in the Rocky Mountains to Arizona. Also in Acia. Summer. Described in our first edition as Arenaria biflòra (L.) S. Wats.
Arenaria verna L. Mant. 72. 1767.
A. verna propinqua Fernald, Rhodora 8: 32. 1906.
Perennial, densely tufted, flowering stems erect or ascending, 1-5' high, branching, glabrous or sparingly pubescent. Leaves subulate-linear, rather rigid, imbricated below, more distant above, 2"-4" long, the upper a little shorter and broader than the lower; flowers 2"-3" broad, numerous in loose cymes; pedicels 2"-4" long; sepals lanceolate, acuminate, 1 1/2"-2" long, 3-ribbed; petals slightly longer than the sepals; capsule 3-valved, exceeding the sepals; seeds rugose.