MORNING-GLORY FAMILY 197 
4. A. syriaca-L. Common MiLrkweep. Stem stout, 3-4 ft. high, 
fineity downy. Leaves 4-8 in. long, oblong or nearly so, downy be- 
neath. Umbels terminal or nearly so. Flowers varying from purple 
or greenish-purple to whitish, numerous, with a strong, sweet but 
sickening odor; hoods with a tooth on each side of the stout horn. 
Common in rich soil. ae 
5. A. phytolaccoides Pursh. Poxre-LeEavep Mi_kweep. Stem 
rather slender, 3-5 ft. high. Leaves 6-9 in. long, ovate or oval- 
lanceolate, taper-pointed, short-petioled. Umbels several, mostly lat- 
eral; pedicels slender and drooping. Lobes of the corolla greenish; 
hoods white, with 2 teeth; horns with an awl-shaped point extending 
far out of the hoods. Damp thickets N. and E. 
6. A. variegata L. Wuitr MILKweerp. Stem stout, leafless and 
smooth below, leafy and downy in lines above. Leaves opposite, the 
middle ones sometimes in fours, petioled, ovate to obovate, cuspidate, 
smooth on both sides, pale beneath, edges slightly crenate. Umbels 
1-5, compact, downy, 1-2 in. long; pedicels erect, as long as the 
peduneles. Corolla white, often purple at the base; hoods roundish, 
spreading, a little longer than the thick, aw]l-pointed, incurved horn. 
Dry. open woods E, and S.* 
7. A. quadrifolia L. Four-Leavep MitKweep. Stem slender, 
1}-2 ft. or more high, usually leafless below. Leaves in 1 or 2 whorls of 
4 each, near the middle of the stem, and a pair or two opposite, thin, 
slender-petioled, 2-4 in. long, ovate-lanceolate, taper-pointed. Umbels 
usually 2, sometimes 1, with slender pedicels. Corolla lobes very pale 
pink or whitish; hoods white ; horn short, stout, and bent inward. Dry 
woods and fence rows. 
Ill. HOYA R.Br. 
Shrubby, more or less climbing, smooth, tropical plants. 
Leaves fleshy. Calyx 5-cleft; corolla 5-lobed, wheel-shaped, 
its divisions thick and with a waxy look; crown of 5 spread- 
ing segments; pollen masses fastened by the bases. 
1. H.carnosa R.Br. Wax Pranr. Stems long and slender, root- 
ing and trailing. Leaves oval or nearly so, thick, dark green. 
Flowers in close umbels, pink or whitish, the corolla lobes covered 
on the upper surface with minute projections. Cultivated from 
India as a house plant and in conservatories. 
83. CONVOLVULACEZ. Mornine-Grory Famiry 
Usually twining herbs or shrubs, often with milky juice. 
Leaves alternate (wanting in Cuscuta), without stipules. 
