DICOTYLEDONOUS PLANTS 183 



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. 



II. 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 Plant. Stems long and slender, 

 rooting 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. 



82. CONVOLVULACE^. Morning-glory Family. 



Usually twining herbs or shrubs, often with milky juice. 

 Leaves alternate (wanting in Cuscuta), without stipules. 

 Flowers variously clustered, rarely solitary, often large and 

 showy. Sepals 5. Corolla hypogynous, regular, tubular, bell- 

 shaped or funnel-shaped ; its limb more or less 5-lobed or 

 angled. Stamens 5, inserted on the corolla-tube. Ovary 

 usually 2-4-celled ; style slender, 2-4-cleft ; ovules 1 or 2 in 

 each cell. Capsule 1-4-celled, 2-4-valved or bursting open 

 across the base. 



I. CALYSTEGIA, R. Br. 



Twining, trailing, or nearly erect perennials. Leaves heart- 

 shaped or arrow-shaped. Flowers peduncled, axillary and 

 solitary. Calyx enclosed in 2 large, leaf-like, usually heart- 

 shaped bracts ; sepals equal. Corolla bell-funnel-shaped, its 

 border nearly or quite entire ; style 1 ; stigmas 2. Pod 1-celled 

 or partially 2-celled, 4-seeded. 



1. C. sepium, R. Br. Creepers, Rutland Beauty. Stem 

 twining or sometimes extensively trailing. Leaves heart-arrow- 



