CONVOLVULACE.E. (CONVOLVULUS FAMILY.) 205 



Tribe I. Plants with ordinary foliage, not parasitic. 



1. Ipomoea. Style undivided, terminated by a sinyle capitate or globose stigma. Corolla 



from salverform or fuiinelform to nearly caiiipanulata 



2. Convolvulus. Style undivided or 2Hdeft oidy at, the apex : Btlpmas 2. from lincar-Oli- 



forni to subulate or ovate. Corolla from fuiinelform to campaiiulaU!. 



3. Evolvulus. Styles 2, distinct or sometimes united below, each 2-cJeft : stijjmaa linear- 



filiform or somewhat cluvate. Corolla from funnelform to almost roUte. 



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



4. Cuscuta* Corolla imbricated in the bud, appendaged below the stamens. 



1. IPO MCE A, L. MORNINO^LORY. 



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

 of corolla entire, or barely angulate or k)bed. 



1. I. leptophylla, Torr. Very glabrous : stems erect or a-sconding (2 to 

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

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

 ered : outer sepals shorter : corolla pink-purple, funnelform, al)out 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 flat : 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, II. Br. From Utah to Canada and the X. At- 

 lantic States. 



Var. Americanus, Sims. Corolla pink or rose-j)urple : bracts obtuse. — 

 From Oregon to Canada and the Carolinas. 



Var. repens, Gray. Corolla irom almost white to rose-color : bract,<« from 

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

 and sometimes flowering stems extensively prostrate : leaves more narmwly 

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

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

 Mexico to Texas, the Dakotas, and eastward. 



* * Stigmas flliform or narrowly linear: no bracts at or near the base of thr 



calyx. 



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

 silky pubescence : stems filiform, 1 to 3 feet long, mainly procnml.cnt : leaves 

 polymorphous; some simply lanceolate- or linear sagittate or Iia.<tato. obttiso 

 and mucrouate, entire, and with the narrow elongated bas:il lobes entire or 3 



