966 CUSCUTACEAE 



longer than the subtending petioles or longer than the leaves : bracts ovate or oblong- 

 ovate, 2-3 cm. long : calyx glabrous, enclosed by the bracts : sepals oblong to oblong-lan- 

 ceolate, 10-13 mm. long, obtuse or acutish : corolla 4-5 cm. long, pink or rose-purple ; 

 limb 5-7 cm. broad, sometimes variegated : capsules ovoid-globose, 1 cm. in diameter. 

 In thickets and along fences, Nova Scotia to Montana, North Carolina and Utah. Summer. 



2. Convolvulus sepium L. Similar to C. Americanus in habit : leaf-blades relatively 

 broader and more rounded to the apex, the basal lobes rounded or angulately toothed, 

 directed backward, not spreading. 



In thickets and waste places, locally naturalized in North America, except the extreme north. 



3. Convolvulus repens L. Softly pubescent. Stems trailing or twining, sometimes 

 twisted^ : leaf -blades typically narrowly or broadly sagittate, 5-8 cm. long, cordate at the 

 base ; petioles about J as long as the blades except the lower ones : peduncle surpassing 

 the leaves or at least the petioles: bracts ovate-oblong or oblong-lanceolate, 1.5-2.5 cm. 

 long : calyx included by the bracts, glabrous or glabrate : sepals lanceolate or oblong to 

 ovate-lanceolate, acute : corolla white or pinkish, 4-5 cm. long ; limb 4-6 cm. broad, 

 undulate : capsules globular, about 1 cm. in diameter. 



In dry soil or old fields, Virginia to South Dakota, Florida and Texas. Spring and summer. 



4. Convolvulus spithamaeus L. Finely pubescent. Stems erect or decumbent, 1- 

 7 dm. long, not twining, simple or sparingly branched : leaf- blades oblong-ovate or fiddle- 

 shaped, 4-10 cm. long, apiculate, entire, rounded or subcordate at the base ; petioles 5-15 

 mm. long : peduncles longer than the leaves or shorter : bracts ovate or oblong, 1.5-3 cm. 

 long : calyx delicate : sepals acute, or acuminate, as long as the bracts or shorter : corolla 

 white or pink, 3-4 cm. long ; limb 4-6 cm. broad, undulate : capsules globular, about 1 

 cm. in diameter. 



In dry or rocky soil, Nova Scotia to the Northwest Territory and Florida. Spring and summer. 



5. Convolvulus arvensis L. Glabrate. Stems branched at the base ; branches 

 prostrate or low twining : leaves alternate ; blades oblong or ovate-sagittate or linear-has- 

 tate, 1-5 cm. long, obtuse or acutish ; petioles seldom as long as the blades : peduncles 

 shorter than the subtending leaves : calyx naked : sepals oval to suborbicular, obtuse or 

 acutish, 3-3.5 mm. long : corolla white or rose-tinged ; limb 1.5-2 cm. broad : capsules 

 oval or ovoid, 5-7 mm. long. 



In waste places and fields, commonly established in northeastern North America and sparingly so 

 in the southeastern United States. Native of Europe and Asia. Spring and summer. 



6. Convolvulus hermannioides A. Gray. Silky tomentulose. Stems commonly 

 branched at the base ; branches spreading or procumbent, 3-15 dm. long : leaf-blades 

 ovate, oblong or oblong-lanceolate, 1.5-7 dm. long, sinuate or incised-toothed, cordate at 

 the base ; petioles ^ as long as the blades or shorter : peduncles shorter than the subtend- 

 ing leaves : sepals becoming about 1 cm. long, auricled at the base : corolla white, about 

 2-2.5 cm. long; limb 1.5-2 cm. broad, angulate : capsules depressed, 8-10 mm. high in- 

 cluding the long beak. 



On dry prairies, Texas. Spring to fall. 



7. Convolvulus incanus Vahl. Cinereous. Stems often branched at the base ; 

 branches mainly procumbent, 3-10 dm. long : leaf-blades very variable, linear-sagittate to 

 lanceolate or hastate, with more or less lobed basal auricles, or pedate, 2.5-5 cm. long, 

 often mucronate : peduncles 1-2-flowered : sepals becoming 6-8 mm. long, not auricled at 

 the base : corolla white or pink, about 12 mm. long, and 15 mm. broad, the lobes acumi- 

 nate : capsules 6-8 mm. high, including the short beak. 



On dry hills and prairies, Nebraska to Arkansas, Colorado, Texas and Arizona. Spring and summer 



8. Convolvulus Havannsis Jacq. Minutely pubescent or glabrate. Stems branch- 

 ing at the base ; branches shrubby, procumbent or somewhat twining : leaves numerous ; 

 blades leathery, oblong, elliptic or suborbicular, or commonly slightly broadest below the 

 middle, 1-2.5 cm. long, obtuse or retuse and mucronate, somewhat revolute, short-petioled : 

 peduncles several-flowered or rarely 1-flowered : sepals ovate, becoming 2.5-3 mm. long : 

 corolla white, 10-12 mm. broad, the lobes acute : capsules ovoid, 4-5 mm. long, freely 

 splitting into several lanceolate valves. 



In sandy soil, peninsular Florida and the Keys. Also in the West Indies. Throughout the year. 



FAMILY 3. CUSCUTACEAE Dumort. DODDER FAMILY. 



Herbaceous parasites, with white, yellow or orange foliage which sometimes 

 contains a coloring matter, possibly chlorophyll. Stems starting from the ground 



