970 HYDKOLEACEAE 



1. HYDROPHYLLUM L. 



Biennial or perennial herbs, with pubescent foliage. Leaves alternate : blades lobed, 

 pinnatifid or pinnately divided. Cymes peduncled, more or less scorpioid. Calyx pedi- 

 celled : tube short : lobes 5, narrow, with naked or appendaged sinuses. Corolla white, 

 blue or purple : tube short : lobes 5, convolute, each furnished with a linear appendage 

 within. Stamens 5, exserted : filaments partially pubescent. Ovary 1-celled, pubescent. 

 Style 2-cleft. Ovules 4, enclosed by the fleshy placenta which is attached to the top and 

 bottom of the cavity. Capsule 2-valved. Seeds 1-4, thick. WATER-LEAF. 



Perennials ; calyx destitute of reflexed appendages at the sinuses. 



Leaf-blades pinnate or pinnatifid : inflorescence conspicuously hirsute. 



Stems barely pubescent : calyx-lobes nearly distinct, linear. 1. H. Virginicum. 



Stems hispid or hirsute : calyx-lobes longer than the tube, lanceolate or 



oblong-lanceolate. 2. H. macrophyttum. 



Leaf-blades palmately 5-7-lobed. 3. H. Canadcnse. 



Biennial : calyx with reflexed appendages at the sinuses. 4. H. appendiculatuw. 



1. Hydrophyllum Virginicum L. Foliage strigillose. Stems 2-7 dm. tall, simple 

 or branched, nearly glabrous : leaves 1-3 dm. long, or the upper ones shorter ; blades 

 pinnately divided, the segments coarsely toothed or incised, acute or acuminate ; petioles 

 longer than the blades or the upper ones shorter : peduncles longer than the subtending 

 petioles, simple or forked : cymes becoming open : calyx bristly ; lobes linear, about 5 mm. 

 long, strigillose on the back, nearly distinct : corolla white or purplish, about 1 cm. long : 

 filaments slightly pubescent : capsules subglobose, 3-4 mm. in diameter. 



In moist woods, Quebec to Manitoba, South Carolina and Kansas. Spring and summer. 



2. Hydrophyllum macrophyllum Nutt. Foliage hispid. Stems 2-6 dm. tall, 

 simple or branched : leaves 2-3 dm. long, or the upper ones smaller ; blades pinnatifid, 

 longer than the petioles ; segments oblong, elliptic or oval, coarsely serrate or incised, the 

 upper ones confluent : peduncles stout, 1-3 dm. long, simple or branched above : cymes 

 capitate or somewhat open : calyx bristly ; lobes lanceolate or oblong-lanceolate, longer 

 than the tube, acute: corolla white, about 1 cm. broad ; lobes oblong, notched at the apex, 

 their subulate appendages pubescent at the base : capsules 3-4 mm. broad, hirsute. 



In woods, Ohio to Virginia, Illinois and Alabama. Spring. 



3. Hydrophyllum Canadnae L. 'Foliage hirsute or glabrate. Stems solitary or 

 tufted, 2-7 dm. tall, sometimes sparingly branched : leaves few ; blades palmately 5-7- 

 lobed, 0.5-3 dm. in diameter ; lobes coarsely toothed or slightly lobed ; petioles commonly 

 longer than the blades : cymes 2-6 cm. broad : peduncles simple or commonly forked : 

 calyx sparingly hispid, or nearly glabrous ; lobes linear or nearly so, 4-5 mm. long : corolla 

 white, 1-1.5 cm. broad : filaments densely villous: capsules about 4 mm. indiameter, finely 

 pubescent. 



In damp woods, Massachusetts to Illinois and North Carolina. Summer. 



4. Hydrophyllum appendiculatum Michx. Foliage hirsute. Stems erect, 3 -6 dm. 

 tall, usually branching : leaves variable ; blades oblong to suborbicular in outline, cordate, 

 those of the lower leaves pinnatifid ; others palmately 5-7-lobed ; lobes or segments coarsely 

 toothed, acute or acuminate : cymes rather open : pedicels slender, becoming 1-2 cm. long: 

 calyx bristly ; lobes subulate-lanceolate, accompanied by a reflexed appendage at each 

 sinus : corolla violet or purple, 1-1.5 cm. broad : capsules about 3 mm. in diameter. 



In damp woods, Ontario to Minnesota, North Carolina and Kansas. Spring. 



2. NEMOPHILA Nutt. 



Annual diffuse herbs, with pubescent foliage. Leaves alternate or opposite : blades 

 lobed or pinnatifid. Flowers solitary on axillary or terminal pedicels. Calyx not accres- 

 cent : lobes 5, accompanied by a spreading or reflexed appendage in each sinus. Corolla 

 white, blue or variegated, campanulate or rotate : tube usually with 10 appendages within 

 near the base : lobes convolute, surpassing the calyx. Stamens 5, included : filaments 

 short. Ovary 1-celled. Styles 2-cleft. Ovules 2-12 in each fleshy placenta which is at- 

 tached to the top and bottom of the cavity. Capsule 2-valved. Seeds usually 1-4. 



Leaf-segments 3-5 : calyx with inconspicuous appendages : corolla less than 3 mm. broad. 



1. N. microcalyx. 

 Leaf-segments 5-9 : calyx with appendages % as long as the lobes : corolla 20-25 mm. broad. 



2. N. phacelioides. 



1. Nemophila microcalyx (Nutt.) F. & M. Foliage sparingly pubescent or gla- 

 brate in age. Stems branched at the base ; branches diffusely spreading or prostrate, 0.5-4 



