R VNCJNCULACEAE. 5 



ami toothed, the upper nearly sessile, deeply lobed or divided: lobes oblong 

 or linear, obtuse, entire or toothed: petals about as long- as the sepals, pale 

 yellow: head of fruit oblong or cylindric: achenes mucronulate. Wet ditches: 

 June-August; frequent; Scott, Emmet, and Calhoun counties. 



R. rhomboideus Goldie. Prairie U. Stem 4-10 inches high, hairy, some 

 branched: root-leaves roundish to rhombic-ovate, toothed or crenate, others 

 3-o-lobed or -parted, the upper sessile or nearly so: petals large, deep yellow: 

 head of fruit spherical: achenes orbicular, minutely beaked. Prairies: April 

 -May: frequent: Winneshiek. Fayette, Emmet, Lyon, and Calhoun counties, 

 i h\ oralis Raf. ) 



R. cymba'aria Pursh. Seaside C. Low. smooth, spreading by long root- 

 ing runners, leaves clustered at the roots and on the joints of the runners, 

 long-petioled, cordate or kidney-shaped, crenate: scapes 1-several flowered, 

 sometimes leaf bearing toward the base: petals sometimes as many as 8. Dry 

 prairies and sandy shores; June-August: infrequent: Story. Dickinson, Em- 

 met. Sioux, and Lyon counties. ( Oxygraphis eyiribalaria ( Pursh. ) Prantl. ) 



R. af finis R. Br. A small hairy or glabrous plant, from 4-10 inches high: 

 flowers small, pale yellow: root-leaves pedately cleft, stem leaves with nar- 

 row oblanceolate divisions: heads oblong. Reported from Iowa. ( R. pcrta- 

 tifidus J. E. Smith. ) 



MYOSURUS Dill. Small annual herbs, with linear basal leaves, and 1- 

 fiowered scapes. Sepals 5, spurred. Petals small, narrow. Stamens usually 

 many. Pistils numerous. 



M. minimus L. Mouse-tail. Low. 1-6 inches high, glabrous: roots fibrous: 

 leaves tufted, entire; achenes numerous, on an elongated receptacle, glabrous, 

 apiculate. Alluvial soil: April- July: Muscatine county, reported from Scott 

 county. 



CALTHAL. Glabrous perennial succulent herbs, with orbicular or kid- 

 ney-shaped leaves, and conspicuous flowers. Sepals 5-9. petaloid. deciduous. 

 Petals none. Stamens many. Pistils 5-10; styles obscure. Pods compressed, 

 spreading, bearing the many seeds in two rows along the ventral suture. 



C. palustrisL. Marsh Marigold. Stems 1-2 feet high, hollow, grooved, 

 stout: basal leaves long-petioled. cordate or reniform, with a narrow sinus, 

 entire or cresate, the upper with shorter petioles and more or less truncate 

 bases: sepals oviil. obtuse, yellow. Swamps, banks of streams: April-May: 

 frequent: Winneshiek. Fayette. Scott, Muscatine, Johnson, Story, Emmet, 

 Dickinson, and Woodbury counties. 



ISOPYRUM L. Smooth perennial herbs, with ternately decompound 

 leaves, and axillary or terminal long-paduncled flowers. Sepals 5. petaloid, 

 deciduous. Petals in ours none. Stamens many. Pistils usually 4. Pod o- 

 vate or oblong, sessile, 2-several seeded. 



I. biternatum ( Raf. ) T. & G. Roots many, fibrous, occasionally thicken- 

 ed into small tubers. Moist woods: May: common: Winneshiek, Fayette, 

 Scott, Muscatine, Henry. Johnson. Story, Emmet, Decatur, and Calhoun coun- 

 ties. 



AQUILEGIA L. Perennial herbs, with ternately compound long-petioled 

 leaves, and showy flowers. Sepals 5, petaloid. Petals 5, prolonged back- 

 ward into long hollow spurs. Stamens numerous, exserted. Pistils 5. 



A. canadensis L. Wild Columbine. Stem 1-3 feet high, branched: leaflets 

 lobed; flowers solitary, large, scarlet, nolding, sours pointing upward: pods 

 erect. Woodlands; May-June: common throughout. 



