HYDEOLEACEAE. 235 



5. 0. Gronovii Wilkl. Branches slender, sometimes matted: corolla about 3 

 mm. long; lobes obtuse, somewhat shorter than the tube: scales sparingly 

 fringed at the top, more sparingly so on the sides: capsules about 3 mm. long. 

 — Common, on bushes and herbs. 



6. C. compacta Juss. Branches stoutish, often widely matted: corolla about 

 4 mm. long; lobes obtuse, much shorter than the tube: scales fringed mainly 

 near the top : capsules 3-3.5 mm. long. — Susquehanna valley. — Common, on 

 shrubs. 



Family 3. HYDEOLEACEAE. Water-leaf Family. 



Annual or perennial herbs, or shi'ubby plants. Leaves alternate or op- 

 posite: blades toothed, lobed, or dissected, or rarely entire. Flowers 

 purple, in seorpioid racemes, or in cymes. Calyx of 5 partly united sepals. 

 Corolla regular, of 5 partly united petals, the tube often appendaged 

 within. Androecium of 5 stamens, the filaments partly adnate to the 

 corolla. Gynoecium 2-carpellary. Fruit a capsule. 



CoroHa-lobes convolute In the bud : ovary-placentae dilated. 



Calyx not much enlarged at maturity : stamens exserted. 1. IIVDnoPHi'LLUiI. 



Calyx much enlarged at maturity : stamens included. 2. Nyctelea. 



Corolla-lobes imbricate in the bud : ovary-placentae narrow. 3. Phacelia. 



1. HYDROPHYLLUM [Tourn.] L. Perennial herbs. Leaf-blades lobed, 

 pinnatitid, or pinnately divided. Cymes long-peduncled. Calyx but little 

 changed in fruit. Corolla white or colored. Filaments surpassing the corolla- 

 lobes, bearded at the middle. Seeds reticulate. — Water-leaf. 



Calyx imappendaged : lobes linear : plants perennial. 



Leaf-blades pinnatitid or pinnately lobed. 1. H. virginicum. 



Leaf-blades palmately lobed. 2. II. canadense. 



Calyx with reflexed appendages at each sinus ; lobes lanceo- 

 late : plants biennial. 3. H. appendiculatum. 



1. H. virginicum L. Plants 2-7 dm. tall: leaf -segments coarsely toothed or 

 incised: cymes open: calyx-lobes linear, about 5 mm. long, much longer than 

 the tube: corolla white or purplish, 8.5-10 mm. long; lobes rounded at the 

 apex. — Common, in rich woods. — Spr. and sum. 



2. H. canadense L. Plants 2-7 dm. tall: leaf -lobes coarsely toothed or again 

 lobed: cymes open: calyx-lobes linear to linear-lanceolate, much longer than 

 the tube : corolla white, 9-10 mm. long, the lobes notched at the apex. — Sus- 

 quehanna valley. Occasional, in rich soil, on the river shore and islands. — 



Schists. — Sum. 



3. H. appendiculatum Michx. Plants 3-6 dm. tall: leaf -lobes coarsely toothed, 

 acute or acuminate: cymes open: calyx-lobes narrowly lanceolate or subulate- 

 lanceolate, much longer than the tube: corolla 9-11 mm. long; lobes rounded 

 at the apex. — M. Bare, in rich soil. — Limestones. — Sum. 



2. NYCTELEA Scop. Annual herbs. Leaf-blades pinnately divided 

 or 1-3-pinnatifid. Flowers solitary in the axils. Calyx accrescent. Corolla 

 white or bluish, commonly smaller than the calyx. Filaments included, often 

 unequal, not dilated. Styles united. 



1. N. Nyctelea (L.) Britton. Plants 0.5-3 dm. tall, ultimately diffusely 

 branched: leaf -blades with spreading segments: pedicels 1-2 cm. long: calyx- 

 lobes triangular-lanceolate, becoming 7-8 mm. long: corolla 4-6 mm. long: 

 capsules 5-6 mm. in diameter, pubescent. — Susquehanna valley. — Occasional, 

 in rich soil, on the river shore and islands. — Spr. 



