20 APOCYNACEAE. Vou. III. 
Flowers small, cymose. 
Erect or diffuse herbs; corolla campanulate. 3. Apocynum. 
High-climbing vines ; corolla funnelform. 4. Trachelospermum- 
1. AMSONIA Walt. Fl. Car. 08. 1788. 
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 
ae in the southern and southwestern United States. Type species: Amsonia Tabernaemontana 
alt, 
1. Amsonia Ams6nia (L.) Britton. Am- 
sonia. Fig. 3374. 
Tabernaemontana Amsonia L. Sp. Pl. Ed, 2, 308. 
1762. 
Amsonia Tabernacmontana 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, nar- 
rowed at the base, sometimes pubescent beneath, 
2'-4’ long, 4’-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 soli- 
tary 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 convo- 
lute, 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. Typ« 
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, 1-23’ long, 4’-1' wide; 
flowers not numerous, solitary in some of the 
axils, blue, 9-15” broad; peduncles slender, 4’-14’ 
long; calyx very deeply parted, the segments subu- 
late-lanceolate, glabrous, about 14’ 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, On- 
tario to Connecticut, southern New York and Geor- 
gia. Native of Europe. Leaves shining. Also called 
running myrtle or small periwinkle, Feb.—May. 
