CONVOLVULACE^. 245 



without scales. Stamens 5, inserted into the base of the corolla. 

 Ovary simple, mostly 2 4-celled ; styles united or more or less 

 distinct; stigmas obtuse or acute. Capsule 1 4-celled. Seeds 

 with a small quantity of mucilaginous albumen, a curved embryo 

 and leafy shrivelled cotyledons. Herbaceous plants or shrubs, 

 usually twining and milky. Leaves alternate, very often cor- 

 date, entire or lobed. Flowers large and showy. 



CONVOLVULUS. Linn. Bindweed. 

 (From the Latin convolve, to entwine.) 



Calyx 5-parted, naked or with 2 bracts at base. Corolla 

 funnel-form or campanulate, with 5 plaits. Stamens 5, shorter 

 than the limb. Style undivided. Stigma capitate or lobed. 

 Capsule 2 3-celled, 2 3-valved. 



1. C. arvensis Linn.: stem twining, angular; leaves sagittate-hastate, 

 with acute lobes ; peduncles mostly 1-flowered ; bracts minute, remote from 

 the flower ; sepals roundish-ovate. 



Fields. Maine to Car. ; rare. June, July. 'ZJ.. Root long, creeping. Stem 

 2 3 feet long, climbing, somewhat hairy. Leaves small, ovate-oblong, on short 

 petioles. Flowers white, an inch long, on axillary peduncles which are longer 

 than the leaves. Introduced, and, on account of its deep and spreading roots, 

 becoming in many places a troublesome weed. Common or Corn Bindweed. 



2. C. Sepium Linn. : stem twining ; leaves sagittate, very acute, with 

 the lobes truncate ; peduncles square, 1-flowered ; bracts large, cordate, 

 close to the flower. Calystegia Sepium Brown 



Moist grounds. Can. to Car. W. to Miss. June, July. 'Zj.. Stem 3 12 

 feet long, climbing or trailing, nearly smooth. Flowers large, white, on pedun- 

 cles which are longer than the leaves. Great Bindweed. 



3. C. panduratus Linn. : stem twining ; leaves cordate or panduriform, 

 acuminate, the lobes rounded ; peduncles long, with small bracts at the 

 base ; flowers in fascicles ; corolla tubular-campanulate. 



Sandy fields. N. Y. to Flor. W. to Ohio. July. 1}.. Root very large and 

 thick. Stem 4 6 feet long, mostly trailing, at length nearly smooth. Flowers 

 mostly 2 5 in a fascicle, on peduncles 3 or 4 inches long. Corolla white, the 

 tube purple. Medicinal. Man of the Earth. 



4. C. spithamaus Linn. : stem erect or oblique ; leaves oval or oblong, 

 subcordate, pubescent, hoary ; peduncles 1-flowered, about as long as the 

 leaves ; bracts close to the flower, much larger than the calyx. C. stanir 

 Mich. Calystegia tomentosa and spithamcca Pursh. 



Sandy woods. Can. to Virg. June. 1\.. Stem 8 18 inches long, sometimes 

 nearly procumbent. Leaves varying from acute to obtuse, arid rounded. Flowers, 

 white, on peduncles which are about as long as the leaves. A variable species 



Upright Bindweed. 



5. C. purpureus Linn : stem twining and climbing ; leaves cordate, 

 acuminate, undivided, entire ; peduncles 2 3-flowered ; pedicels thickened, 

 nodding ; capsule smooth. Ipomcea purpurea Pursh. Pharbitis hispida. 

 Choisy,in D. C. 



