Perennial herbs, with alternate membranous leaves, and rather large blue or bluish flowers, in terminal thyrsoid or corymbose cymes. Calyx 5-parted, the segments narrow, acuminate. Corolla mostly salverform, the tube cylindric, but somewhat dilated at the summit, villous within. Stamens inserted on the throat of the corolla, included; anthers ovate or oblong. Disk none. Ovary of 2 carpels, connected at the top by the filiform style; ovules in 2 rows in each cavity, numerous; stigma appendaged by a reflexed membrane. Fruit of 2 cylindric several-seeded follicles. Seeds cylindric or oblong, obliquely truncate at each end, not appendaged. [Named for Charles Amson of South Carolina.]

About 8 species, natives of North America and eastern Asia. Besides the following, 5 others occur in the southern and southwestern United States. Type species: Amsonia Tabernaemontana Walt.

1 Amsonia Walt Fl Car 98 1788 45

I. Amsonia Amsonia (L.) Britton. Am-Sonia

Fig. 3374

Tabernaemontana Amsonia L. Sp. Pl. Ed. 2, 308.

1762. Amsonia Tabernaemontana Walt. Fl. Car. 98. 1788. A. salicifolia Pursh, Fl. Am. Sept. 184. 1814. A. Amsonia Britton, Mem. Torr. Club 5: 262. 1894.

Glabrous or nearly so, simple, or branched above, 2°-4° high. Leaves ovate, ovate-lanceolate or lanceolate, entire, acuminate at the apex, narrowed at the base, sometimes pubescent beneath, 2'-4' long, i-2'wide; petioles 2"-4" long; flowers numerous; pedicels bracteolate at the base; calyx about 1" long, its segments subulate; corolla 6"- 9" long, beaked by the convolute limb in the bud, its lobes linear and about as long as the tube; follicles 2'-4' long, about 2" thick, attenuate at the apex, glabrous, divergent or ascending; seeds papillose.

In moist soil. New Jersey to Illinois, Kentucky, Missouri, Florida and Texas. Consists of several races, differing in leaf-form. April-July.

2. ViNCA L. Sp. Pl. 209. 1753. Erect or trailing herbs, some species slightly woody, with opposite leaves, and large solitary blue pink or white axillary flowers. Calyx 5-parted, the segments narrow, acuminate. Corolla salverform, the tube cylindric, or expanded above, pubescent within, the lobes convolute, at least in the bud, oblique. Stamens included. Disk of 2 glands, alternate with the 2 carpels. Ovules several in each carpel; style filiform; stigma annular, its apex penicillate. Follicles 2, erect or spreading, cylindric, several-seeded. Seeds oblong-cylindric, truncate at each end, not appendaged. [The Latin name.]

About 12 species, natives of the Old World. Type species: Vinca major L.

1. Vinca Minor L. Periwinkle. Myrtle

Fig. 3375

Vinca minor L. Sp. Pl. 209. 1753.

Perennial, trailing, glabrous; stems 6'-2° long. Leaves oblong to ovate, entire, firm, green both sides, obtuse or acutish at the apex, narrowed at the base, short-petioled, 1-21/2' long, 1/2-1' wide; flowers not numerous, solitary in some of the axils, blue,9"-15" broad; peduncles slender, 1/2'-1 1/2 long; calyx very deeply parted, the segments subulate-lanceolate, glabrous, about 1 1/2' long; corolla-tube expanded above, as long as or slightly longer than the obovate, nearly truncate lobes; anther-sacs with a broad connective; follicles few-seeded.

Escaped from gardens to roadsides and woods. Ontario to Connecticut, southern New York and Georgia. Native of Europe. Leaves shining. Also called running myrtle or small periwinkle. Feb.-May.

1 Vinca Minor L Periwinkle Myrtle 46