nr, CUSCUTACEAE. 



C. spithamoeus L. Stem simple erect or ascending 1 , tomentose, 4-12 in- 

 ches high; leaves short-petioled, oblong-, with a somewhat sagittate or cor- 

 date base. Stigmas oval; "bracts ovate. Dry soil; May-August; infrequent; 

 Johnson county. 



C. arvensis L. Mostly prostrate; leaves narrowly sagittate or hastate; 

 calyx bractless; corolla small, pink or whitish; peduncles with 2 small bracts 

 near the base; styles slender.. Fields and waste places; May-September; in- 

 frequent; Muscatine. Johnson, Henry, Decatur, Taylor, and Fremont coun- 

 ties; reported from Fayette and Scott counties. 



IPOMOEA L. Mornins Gt,ORy. Calyx of o-sepals, outer sepals usually 

 larger, no bracts at the base. Corolla funnelform to campanulate. Stamens 

 included. Style undivided; stigma capitate. 



* Ovary 2-celled, stiyma entire or 2-lnbed. 



I. pandurata (L.) Meyer. Perennial; stems from a large tuber, trailing 

 or twining, smooth; leaves cordate, acuminate; peduncles longer than the 

 petioles, 1-5-flowered; sepals ovate, obtuse; corolla 2-3 inehes long, white, 

 purple inside. Dry soil, thickets and in fields; May-September; Winneshiek, 

 Muscatine, Louisa, Johnson, Henry, Lee, Des Moines, Van Buren. Decatur, 

 and Lyon counties. 



I. lacunosa L. Annual, roots fibrous; glabrous, pubescent or hairy; pedun- 

 cles 1-3-flowered, shorter than the petioles; sepals lanceolate, pointed, mar- 

 gins ciliate; corolla about one-half inch long, white, limb purple, 5-lobed. 

 Moist soil: July-September; infrequent; along the Mississippi river; Musca- 

 tine county. 



* * Ovary 3-celled; stigmas 3. 



I. hederaceci Jacq. Annual, hairy; leaves cordate, 3-lobed, lobes ovate, 

 acute or acuminate, peduncles long, 1-3-flowered, sepals narrowly lanceolate, 

 lower part hairy; corolla white, bluish or purple. Waste grounds; August- 

 September; Johnson, Henry, and Lee counties; reported from Scott county. 



I. purpurea (L.) Roth. Annual, stem, sepals and flowers similar to the 

 preceding but leaves cordate, entire, acuminate. Escaped from cultivation; 

 July-September; Johnson, Henry and Decatur counties; reported from Fay- 

 ette. Scott, and Story counties. 



BREWERIA R. Br. Perennials; for the most part similar to the two pre- 

 ceding genera. Style 2-cleft; stigmas capitate. 



B. pickeringii (Curtis) Gray. Pubescent to glabrate; leaves li near-spa t- 

 ulate to narrowly linear, short-petioled or almost sessile; peduncles about 

 the length of the leaves, with 1-3 small white flowers; bracts large, leaf-like; 

 filaments united to or above the middle, exserted. Sandy soil, along the rail- 

 way; June-August; Muscatine county. 



CUSCUTACEAE Ihtmort. Dodder Family. 

 Annuals, with dextrorsely twining whitish or yellow stems, minute 

 alternate scales instead of leaves, and mostly 5-parted flowers. The 

 young plants attach themselves to various herbs or shrubs by means of 

 suckers, the root and lower portion soon perishing. Flowers mostly 

 white, small, in cymcse clusters. Calyx inferior, 5-cleft or 5-parted or 

 of 5 distinct sepals. Corolla 5-cleft, with 5 fimbriate or crenulate scales 

 in the tube. Stamens 5, alternate with the corolla-lobes, inserted above 

 the scales, exserted or included. Ovary globose or oblong, 2-celled 

 4-ovuled; styles 2, terminal, usually sepaiate. Represented by the <*enus 

 Citscuta L. 



