Water- leaf Family. Ill 



calyx-teeth triangular, much shorter than the tube; corolla purple. Fields; 

 June-August; Jones, Johnson. Linn, Cerro Gordo, and Hancock counties; re- 

 ported from Fayette and Story counties. 



P. pilosa L. Stem 12-18 inches high, hairy or pubescent; leaves lanceolate 

 to linear, gradually tapering to an acute apex; calyx-teeth bristle-pointed a- 

 bout half the length of the corolla-tube; corolla pink or pinkish, lobes obo- 

 vate. entire. Prairie soil; May; common. 



P. divaricate! L. Stem 6-18 inches high, from a more or less decumbent 

 base, pubescent; leaves ovate to oblong-lanceolate; cymes corymbose-panicu- 

 late, loosely spreading; calyx-teeth slender, half the length of the corolla-tube; 

 corolla pale blue or lilac, varying to white, lobes obovate, notched or round- 

 ed. Moist woods; April-May; common. 



P. bifida Beck. Low; stem 5-6 inches high, pubescent; leaves linear to 

 narrowly lanceolate; flowers few, on slender peduncles; calyx-teeth about as 

 long as the tube; corolla purple, lobes cleft to the middle, divisions linear-ob- 

 long. May; sandy soil along Cedar river, Muscatine county; reported ftom 

 Benton county. 



P. subulata L. Ground or Moss Pink. Pubescent or at length glabrate, ev- 

 ergreen; stems tufted, much-branched, diffuse, forming mats; leaves varying 

 from narrowly oblong to linear-subulate, acute or acuminate, rigid, ciliate, 

 usually fascicled; flowers cymose, pink, purple, or white; corolla-lobes cune- 

 ate-obcordate, rarely entire. Sandy or dry soil; April-May; an escape from 

 gardens and cemeteries; Page county; reported from Fayette county. 



POLEMONIUM L. Perennials, with alternate pinnate leaves, and cymose- 

 paniculate flowers. Calyx campanulate, leaf-like, 5-cleft. Stamens 5, equal- 

 ly inserted near the base of the corolla, declined, base of the filaments hairy. 



P. reptans L. Stem 6-14 inches high, weak, branched, spreading; 

 smooth to minutely pubescent; leaflets 7-15, varying from ovate-lanceolate to 

 oblong; flowers corymbose, nodding; calyx somewhat inflated in fruit; cor- 

 olla light blue; stamens and style included. Rich woods; May-June; fre- 

 quent; Winneshiek; Allamakee, Scott, Muscatine, Johnson, Henry, Decatur, 

 Mahaska and Cerro Gordo counties; reported from Fayette, Story, and 

 Cherokee counties. 



COLLOMIA Nutt. Annual. Leaves alternate, entire. Flowers glomer- 

 ate, mostly terminal, with leaf-like bracts. Stamens unequally inserted on 

 the slender funnelform corolla. 



C. linearis Nutt. Stem 6-12 inches high, minutely pubescent; at length 

 much-branched; leaves linear or oblong-lanceolate; corolla slender, varying 

 from purplish to white, limb small. Dry soil; May-August; infrequent; De- 

 catur and Lyon counties. (Oilin linearis Gray). 



HYDROPHYLLACEAE Lindl. Water-leaf Family. 

 . Herbs, with alternate or basal, lobed or pinnate leaves, and perfect 

 regular blue or white, solitary, cymose or racemose flowers. Calyx 5- 

 cleft, persistent, free, often appendaged. Corolla 5-lobed. Stamens 5, 

 inserted on the corolla-tube. Style deeply 2-cleft. Ovary entire, 1-celled, 

 rarely 2-celled, with 2-parietal placentae. 



Hvdrophylldm. Stamens exserted; calyx not enlarged in fruit. 



Ellisia. Stamens included; calyx' enlarged in fruit. 

 HYDROPHYLLUM L. Watrb-leaf. Perennials. Leaves cut-toothed, 

 mostly pinnate. Flower clusters coiled when young. Calyx 5-parted. Cor- 

 olla campanulate, 5-cleft, nectariferous down the inside of the tube. Stamens 



