CONVOLVULACE^E. (CONVOLVULUS FAMILY.) 265 



Tribe I. Plants with ordinary foliage, not parasitic. 



1. Ipotnoea. Style undivided, terminated by a single capitate or globose stigma. Corolla 



from salverform or funnelform to nearly camparmlate. 



2. Convolvulus. Style undivided or 2-cleft only at the apex : stigmas 2, from linear-fili- 



form to subulate or ovate. Corolla from funnelform to campanulate. 



3. E volvulus. Styles 2, distinct or sometimes united below, each 2-cleft : stigmas linear- 



filiform or somewhat clavate. Corolla from funnelform to almost rotate. 



Tribe II. Leaflets parasitic twining herbs, destitute of foliage and of all green color. 



4. Cuscuta. Corolla imbricated in the bud, appeudaged below the stamens. 



1. IPO MCE A, L. MORNING-GLORY. 



Calyx not bracteate at base, but the outer sepals commonly larger : limb 

 of corolla entire, or barely angulate or lobed. 



1. I. leptophylla, Torr. Very glabrous : stems erect or ascending (2 to 

 4 feet high) from an immense root, with recurving slender branches : leaves 

 linear (2 to 4 inches long), short-petioled, acute : peduncle short, 1 or 2-flow- 

 ered : outer sepals shorter : corolla pink-purple, funnelform, about 3 inches 

 long : seeds rusty-pubescent. Frem. Rep. 95. Plains of Nebraska and 

 Wyoming to Texas and New Mexico. 



2. CONVOLVULUS, L. BINDWEED. 



Twining or prostrate, with small or large flowers. Includes Calystegia. 



* Stigmas from ovate or oval to oblong, very fiat : solitary flower involucellate by 



a pair of persistent broad bracts, which are close to the calyx and enclose or 

 exceed it. 



1. C. sepium, L. Glabrous or pubescent, freely twining: leaves slender- 

 petioled, deltoid-hastate and triangular-sagittate (2 to 5 inches long), acute or 

 acuminate ; the basal lobes or auricles either entire or angulate 2 to 3-lobed : 

 peduncles mostly elongated : bracts cordate-ovate or somewhat sagittate, com- 

 monly acute: corolla broadly funnelform, 2 inches long, white or tinged with 

 rose-color. Calystegia sepium, R. Br. From Utah to Canada and the N. At- 

 lantic States. 



Var. Americanus, Sims. Corolla pink or rose-purple : bracts obtuse. 

 From Oregon to Canada and Carolina. 



Var. repens, Gray. Corolla from almost white to rose-color : bracts from 

 very obtuse to acute : herbage from minutely to tomentose-pubescent : sterile 

 and sometimes flowering stems extensively prostrate : leaves more narrowly 

 sagittate or cordate, the basal lobes commonly obtuse or rounded and entire. 

 Synopt. Fl. ii. 215. Calystegia sepium, var. pubescens, Gray. From New 

 Mexico to Texas, Dakota, and eastward. 



# * Stigmas Jiliform or narrowly linear : no bracts at or near the base of the 



calyx. 



2. C. incanus, Vahl. Cinereous or canescent with a close and short 

 silky pubescence : stems filiform, 1 to 3 feet long, mainly procumbent : leaves 

 polymorphous; some simply lanceolate- or linear-sagittate or hastate, obtuse 

 and mucronate, entire, and with the narrow elongated basal lobes entire or 2 



