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..
Low annual biennial or perennial, more or less pubescent, branching, diffuse or erect herbs, with alternate entire leaves, and small blue pink or white flowers in many-flowered elongated bractless more or less 1-sided racemes, or these sometimes leafy at the base. Calyx 5-cleft, the lobes narrow, spreading or erect in fruit. Corolla salverform, the limb 5- lobed, the lobes convolute in the bud, rounded, the throat crested. Stamens 5, included, inserted on the corolla-tube; filaments filiform; anthers obtuse. Ovary 4-divided, style filiform. Nutlets erect, glabrous or pilose, attached by their bases to the receptacle, the scar of attachment small, flat. [Greek, mouse-ear.]
About 35 species of wide geographic distribution. Besides the following, 1 or 2 others occur in the southern and western parts of North America. Called forget-me-not and scorpion-grass. Type species: Myosotis scorpioides L.
Hairs of the calyx all straight; perennial swamp or brook plants. Calyx-lobes shorter than the tube: corolla 3"-4" broad.
1. M. scorpioides.
Calyx-lobes as long as the tube; corolla 2 -3 broad.
2. M. laxa.
Hairs of the calyx, or some of them, with hooked tips; annuals or biennials. Fruiting pedicels longer than the calyx.
3. M. arvensis.
Fruiting pedicels not longer than the calyx.
Calyx-lobes equal; corolla blue or yellowish, changing to violet and blue. Corolla yellowish, changing to violet and blue; style longer than the nutlets.
4. M. versicolor.
Corolla blue; style not longer than the nutlets.
5. M. micrantlia.
Calyx-lobes unequal; corolla white.
6. M. virgimca.
Myosotis scorpioides var. pahistris L. Sp. Pl. 131. 1753. Myosotis palustris Lam. Fl. Fr. 2: 283. 1778.
Appressed-pubescent, perennial, with slender root-stocks or stolons; stems slender, decumbent or ascending, rooting at the lower nodes, 6-18' long. Leaves oblong, oblanceolate or oblong-lanceolate, obtuse, narrowed at the base, l'-3' long, 2"-6" wide, those of the stem sessile or very nearly so, or the lower petioled; racemes loosely many-flowered; pedicels longer than the calyx; calyx with straight ap-pressed hairs, its lobes equal, triangular-ovate, acute, shorter than the tube, spreading in fruit; corolla blue with a yellow eye, the limb flat, 3"- 4" broad; nutlets angled and keeled on the inner side.
Myosotis laxa Lehm. Asperif. 83. 1818.
Myosotis palustris var. laxa A. Gray, Man. Ed. 5, 365. 1867.
Perennial, appressed-pubescent, similar to the preceding species; stems decumbent, spreading, rooting at the nodes, 6'-2o' long. Leaves oblong, oblong-lanceolate or spatulate, obtuse; racemes very loosely many-flowered; pedicels spreading, much longer than the fruiting calyx; hairs of the calyx straight, appressed, its lobes equal, ovate-lanceolate, acutish, spreading in fruit, quite as long as the tube; corolla blue with a yellow eye, its limb concave, about 2" broad; nutlets convex on both the inner and outer sides.
In wet muddy places, Newfoundland to Ontario, south to Virginia and Tennessee. Also in Europe. Ascends to 3500 ft. in Virginia. May-July.