DIAPENSIACEJE. (DIAPENSIA FAMILY.) 347 
1. P. barbulata, Miehx. (Diapensia, Ell.)— Sandy pine 
barrens of New Jersey and southward. April, May. — Sepals nearly 
equal. Corolla ^ long. Leaves long. 
Order 76. CONVOLVUlAcE^E. (Convolvulus Fam.) 
Twining or trailing herbs , with alternate entire or lobed 
leaves , and regular 5-androus flowers with a calyx of 5 
imbricated persistent sepals , a 5- plaited or b-lobed corolla 
which is twisted or convolute in the bud , and a 2-celled 
(rarely 3- celled) ovary , with a pair of erect ovules from 
the base of each cell; the cells often doubled by a false par¬ 
tition. Fruit a globular 2 - 6 -seeded (often septifragal) 
pod. Embryo large , curved or coiled in sparing mucilagi¬ 
nous albumen. — Flowers usually large and showy, and open¬ 
ing but for one day : pedicels articulated, often 2-bracted. 
Synopsis, 
Suborder I. CONVOLVULE^E. The true Conv. Fam. 
Green and leafy plants. Cotyledons large and foliaceous, variously 
folded and crumpled, the radicle curved. 
1. Calystegia. Calyx inclosed in a pair of bracts. Style 1: stig¬ 
mas 2. 
2. Convolvulus. Calyx naked. Style 1, or barely cleft at the 
apex : stigmas usually 2. 
Suborder II. CUSCUTINE^E. The Dodder Family. 
Parasitic and yellowish or reddish plants, with thread-like naked 
stems and minute scales in place of leaves. Embryo slender, spi¬ 
rally coiled, entirely destitute of cotyledons. 
3. Cuscuta. The only genus of the suborder. 
Suborder I. CONVOLVULI^. The true Conv. Fam. 
1. CAIYSTEGIA, R. Br. Bracted Bindweed. 
Calyx inclosed in 2 large and mostly heart-shaped leafy bracts : 
sepals equal. Corolla between bell-shaped and funnel-form, the 
border obscurely 5-lobed or entire. Stamens included. Style 1 : 
stigmas 2 : ovary imperfectly 2-celled. Pod 1-celled, 4-seeded. 
— Perennials, with heart-shaped or arrow-shaped leaves, and ax¬ 
illary 1-flowered peduncles. (Name from Ka\v£ t calyoc , and <rreya> , 
to cover , alluding to the bracts inclosing the calyx.) 
