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..
Herbs, with opposite membranous entire pinnately veined leaves, small stipules, or the leaf-bases connected by a stipular line, and red yellow or purple flowers in scorpioid cymes or unilateral spikes, or terminal and in the forks of the branches. Calyx deeply 5-parted. Corolla narrowly funnelform, 5-lobed, the lobes valvate, the tube finely 15-nerved. Stamens 5, inserted on the corolla-tube; anthers 2-lobed at the base. Ovules numerous, on peltate placentae; style filiform, jointed near the middle, papillose above; stigma obtuse. Capsule didymous, 2-celled, somewhat flattened contrary to the dissepiment, circumscissile above the persistent base, the 2 carpels becoming 2-valved. Seeds peltate, not winged. [Named for Adrian von der Spigel, 1558-1625, physician.]
Lontcera marylandica L. Sp. Pl. 175. 1753. Spigelia marylandica L. Syst. Ed. 12, 734. 1767.
Perennial, stem 4-angled, glabrous or very nearly so, simple, or branched at the base, erect, 1°-2° high. Leaves sessile, ovate, or ovate-lanceolate, acute or acuminate at the apex, rounded or narrowed at the base, 2'-4' long, ¥-2' wide, sparingly pubescent on the veins beneath; flowers in a solitary (rarely 2 or 3) terminal I-sided peduncled spike; corolla scarlet outside, yellow within, 1'-2' long, narrowed below, its lobes lanceolate, about 3" long; calyx-segments subulate, as long as the corolla-lobes or shorter; style jointed below the middle, exserted or included.