This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol3", 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..
Winter-annual or biennial herbs, with opposite or verticillate leaves, and blue pink white or variegated flowers, verticillate, or solitary in the axils. Calyx campanulate, 5-cleft. Corolla irregular, the tube short, the limb 2-lipped; upper lip 2-cleft, the lobes erect or recurved; lower lip larger, 3-lobed, the lateral lobes spreading or drooping, flat, the middle one condu-plicate, keel-like, enclosing the 4 declined stamens and the filiform style. Stamens didy-namous. Corolla with a gland on the upper side of the tube near the base. Filaments filiform; anther-sacs confluent at the apex. Stigma small, capitate or 2-lobed. Capsule ovoid or globose, septicidally 2-valved, the valves 2-cleft. Seeds few, large, peltate, concave on the inner side. [Named for Zaccheus Collins, botanist, of Philadelphia, 1764-1831.]
About 20 species, natives of North America. Type species: Collinsia verna Nutt.
Corolla s"-8" long, the throat shorter than the limb.
Leaves, at least the lower, ovate or oblong; corolla-lobes notched.
1. C. verna.
Leaves lanceolate; corolla-lobes obcordate.
2. C. violacea.
Corolla a2"-3" long, the throat longer than the limb.
Glabrous or puberulent; stem slender, weak, 6-2° long, simple or branched. Leaves thin, opposite, the lower broadly ovate or orbicular, obtuse at the apex, rounded, narrowed or subcordate at the base, crenate or entire, slender-petioled; middle leaves sessile or cordate-clasping, ovate or oblong, obtuse, dentate, l'-2' long, floral leaves ovate to spatulate, mostly acute, dentate or entire; upper whorls 4-6-flowered; peduncles 1/2'-1' long; corolla 6"-8" long, its throat equalling or shorter than the calyx, its lower lip blue, the upper purple or nearly white, the lobes emarginate or truncate; capsule globose, 2 1/2"-3" in diameter, shorter than the linear calyx-lobes.
The California Collinsia bicolor Benth., which differs from this by short-peduncled flowers, is recorded as found introduced in Illinois.
Collinsia violacea Nutt. Trans. Am. Phil. Soc. (II.) 5: 179. 1833-37.
Similar to the preceding species, stem slender, erect, usually branched, 6'-15' high. Leaves lanceolate or oblong-lanceolate, rather thick, entire or denticulate, obtuse or obtusish, the lower opposite, petioled, the middle similar, sessile, l'-2' long, 3"-5" wide, the floral linear or linear-lanceolate, opposite or verticillate; upper whorls 2-5-flowered: corolla 5"-6" long, violet, its lobes obcordate or emarginate; capsule globose, about 2" in diameter, shorter than the lanceolate acute calyx-lobes.
Rich soil, Missouri, Kansas and Arkansas to Texas. April-May.
Antirrhinum tenellum Pursh, Fl. Am. Sept.
pl. 1082. 1827. C. tenella Piper, Contr. Nat. Herb. 11: 496.
Puberulent, at length diffusely branched; stems very slender, 3'-15' long. Leaves oblong or lanceolate, mostly obtuse at the apex and narrowed at the base, 1/2'-1' long, entire, or sparingly toothed, the lower opposite, sometimes broader, petioled, the floral sessile, opposite or verticillate; upper whorls 2-6-flowered; pedicels commonly longer than the flowers; corolla 3"-4" long, about twice as long as the calyx, blue or whitish, the throat longer than the limb; capsule globose, 1"-1 1/2" in diameter, little shorter than the lanceolate calyx-lobes.
In moist places, Ontario to British Columbia, Michigan, Colorado, Arizona and Utah. April-June.