192 American Midland Naturalist Monograph No. 7 



2. Flowers in scorpioid cymes or loose racemes. 



3. Corolla-lobes convolute in the bud; placentae dilated, enclosing the 

 ovules and seeds; plants perennial or biennial, with long-petioled 



basal leaves 2. Hydrophyllum 



3. Corolla-lobes imbricated in the bud; placentae not dilated, merely 

 forming ridges on the wall of the ovary; plants (in our species) 

 annual (or biennial) with leafy stems, but no conspicuous basal 



leaves 3. Phacelia 



1. Leaves entire 4. Hydrolea 



1. EUisia L. — Waterpod 

 E. nyctelea L. Woods, diickets, cult, ground, and waste places, 

 common throughout III., except the extreme southern counties. Apr.- 

 May. 



2. Hydrophyllum L. — Waterleaf 

 1. Leaves pinnately divided; calyx without appendages between the 

 lobes; plants perennial. 

 2. Stem glabrous or sparsely ptibescent; leaf-segments 5-7, acu- 

 minate; calyx-lobes linear, strigillose on the back, ciUate; 



corolla pale lavender; moist woods, common. May-June 



- H. virginianum L. 



2. Stem retrorsely hirsute; leaf -segments 9-13, obtusish; calyx-lobes 



lanceolate, short- pubescent, and hispidulous; corolla white; 



woods, in s.e. 111. May- June H . macro phyllurn Nutt. 



1. Leaves (at least the upper ones) palmately 5- to 9-lobed. 



3. Pedicels glabrous or nearly so; calyx-appendages minute or 



none; corolla whitish; plants perennial; woods, local. June- 

 July H. canadense L. 



3. Pedicels rather copiously pilose-hispid; calyx with reflexed 

 appendages (1-2 mm long) between the lobes; corolla laven- 

 der; plants biennial; woods, common. May-Jtme. [Decernium 

 ap pendiculatum (Michx.) Brand] ....//. appendiculatum Michx. 



3. Phacelia Juss. 

 1. Stamens longer than the corolla, the filaments pilose; corolla blue, 

 about 1 cm long, appendaged within, the lobes entire; inflores- 

 cence glandtilar, loosely many-flowered; plants biennial; moist 



thickets and along streams. Apr. -June P. bipinnatifida Michx. 



1. Stamens not longer than the corolla, the filaments glabrous; 

 corolla without appendages; inflorescence not glandular; plants 

 annual. 

 2. Corolla about 4 mm long, the lobes entire; calyx-lobes pubes- 

 cent on the back; racemes 2- to 5-flowered; woods, local; 

 Adams, Jackson, Johnson, Union, and Washington counties. 



[P. covillei W^ats.] P. ranunculacea (Nutt. ) Constance 



2. Corolla 6-7 mm long, the lobes fringed; calyx-lobes glabrous on 

 the back, the margins ciliate; racemes 10- to 20-flowered, 

 strongly 1 -sided; moist woods and thickets, usually in allu- 

 vial soil in the s. half of 111. May-June P. purshii Buckl. 



