HHydrophyllacce—Whitlavia. 315 
having purple, blue or pink flowers. 2. Ortgiesidna is a 
recently introduced perennial species of trailing habit with 
purple and white flowers. 
3. WHITLAVIA. 
Dwarf branching glandular pubescent annuals with simple 
petiolate leaves and large campanulate racemose flowers. Calyx 
deeply 5-partite. Corolla tubular - campanulate, inflated at 
the base. Stamens exceeding the corolla; filaments with an 
appendage at the base. Capsule many-seeded. Named in 
honour of Francis Whitla, a patron of botany. 
1. W. grandifléra.This is a very showy plant with large 
deep blue Campanula-like flowers and deltoid or oblong 
coarsely-toothed hispid leaves. A native of California. 
4, WIGANDITA. 
Tall hispid herbaceous plants, remarkable for their large 
bold foliage. Leaves alternate, simple, more or less toothed or 
lobed, becoming gradually smaller upwards. Flowers in gyrate 
cymes, resembling those of Hutoca in structure. The few 
species known are natives of tropical America, and, therefore, 
only available for Summer decoration. This genus was named 
in honour of Wigand, formerly Bishop of Pomerania. 
1. IV. Caracaséna.—A magnificent plant attaining a height 
of 6 to 12 feet or more, densely clothed with broad oval leaves, 
the lower ones from 2 to 3 feet long. 
WW. wrens and W. Vigiért have likewise very large ornamental 
foliage, but the former is clothed with virulent stinging hairs. 
Orpen LXXIV—CONVOLVULACEA. 
Twining or trailing herbs, rarely shrubs or trees. Leaves alter- 
nate, entire or lobate. Flowers in axillary or terminal racemes 
or solitary. Calyx of 5 equal or unequal persistent imbricate 
sepals. Corolla hypogynous, regular, salver-shaped or tubular, 
5-lobed or nearly entire, plaited, convolute or twisted in bud. 
Stamens 5, inserted on the corolla-tube; filaments often dilated 
at the base. Capsule 1-to 4-celled, few-seeded. A large order 
of highly ornamental plants, chiefly natives of tropical countries. 
There are 40 genera and about 650 species. The curious 
leafless genus Cuscuta is referred here. The species are annual 
