HYDROPHYLLACEAE (WATER-LEAF FAMILY) 185 



AA. Corolla white or cream-colored or blue or salmon-colored, various in length and 



in lobing. 

 B. Leaflets 2-3-divided and thus appearing in fascicles or whorls, 2-6 mm. long. 



C. E. P- confertum 

 BB. Leaflets entire, not as if fascicled, usually longer. 



C. Leaflets 2-12 mm. long; stem 5-30 cm. high. 



D. Corolla white, nearly rotate; our only annual species. E. P. micranthum 

 DD. Corolla blue, campanulate; perennial. 



E. Flower violet with a yellow eye. C. E. P. elegans 



EE. Flower pale blue or purplish or white, without eye. 



F. Plants densely caespitose, 5-10 cm. high; leaflets 30-40 C. P. viscosum 

 FF. Plants loosely caespitose, 15-30 cm. high; leaflets 9-21. W. C. E. 



P. humile 



CC. Leaflets 12-35 mm. or more long; stems often over 30 cm. high. 

 G. Corolla salmon- or flesh-colored, 25-37 cm. wide. U. P. carneum 



GG. Corolla white or cream-colored or blue, less than 25 cm. wide. 

 H. Stems 6-9 dm. high; seeds 6-13 in each cell. 



I. Leaflets oblong-ovate. C. E. P. occidentale 



n. Leaflets linear. E. P. pectinatum 



HH. Stems 1.5-5 dm. high; seeds 3-4 in each cell. W. P. amoenum 



HYDROPHYLLACEAE (WATER-LEAF FAMILY) 



Herbs or rarely shrubs, stipules none. Flowers various, mostly 

 in scorpoid bractless clusters. Sepals 5, distinct or nearly so. 

 Corolla regular, 5-lobed, rotate to salverform. Stamens 5, alter- 

 nate with the corolla lobes, on base of corolla. Ovary superior; 

 styles i~2. Fruit a capsule, i-2-celled, 2-4-valved. Seeds 2 to 

 many. 



A. Herbs, not evergreen; leaves without balsamic resin. 



B. Stems elongated, leafy; flowers either not solitary or else not on basal peduncles. 

 C. Flowers grouped in bractless inflorescences; stems and leaves often unlike 

 those in CC. 



D. Style 2-lobed or -cleft at apex; leaves rarely reniform; stems leafy. 

 E. Corolla convolute in the bud; placentae wide. 



F. Annual; stamens included; ovules 4-20. NEMOPHILA (p. 186) 

 FF. Perennial; stamens exserted; ovules 4. HYDROPHYLLUM (p. 187) 



EE. Corolla imbricate in the bud; placentae narrow. 



G. Corolla deciduous, rarely yellowish and then the stamens exserted; sta- 

 mens unequally inserted in the corolla. PHACELIA (p. 186) 



GG. Corolla persistent, yellow or yellowish; stamens included, equally in- 

 serted at the very base of the corolla. EMMENANTHE (p. 186) 

 DD. Style and even the stigma entire; leaves round-reniform, 25 mm. or less 

 wide; stems almost leafless. W. C. (Honor of M. Romanzoff, a Russian 

 nobleman who sent Kotzebue to Alaska.) Romanzoffia sitchensis 

 CC. Flowers solitary in the leaf-axils; stems 5-10 cm. long, dichotomously 

 branched; leaves entire, linear-spatulate, 1-3 cm. long. 



H. Styles 2, distinct to the ovary. E. (Gk. nama = a stream; probably 

 referring to the habitat.) Nama demissum 



