212 American Midland Naturalist Monograph No. 2 



1. Stem diffuse, much-branched, 10-20 cm. long; corolla-lobes bifid. 



6. Corolla-lobes cleft to about the middle; calyx-lobes somewhat longer than 

 the tube; plants puberulent; sandy soil, not uncommon. Apr. -June. 

 Sand Phlox P. bifida Beck 



6. Corolla-lobes lobed at apex; calyx-lobes shorter than the tube; plants gla- 

 brous; limestone cliffs, s. 111., rare; known from Jackson, Union, and 

 Alexander counties. Apr. -May P. stellaria Gray 



2. COLLOMIA Nutt. 



C. linearis Nutt. Dry sandy soil, local; adv. from the West. May-Aug. 

 Known in 111. from Cook, Henry, and Rock Island counties. 



3. POLEMONIUM L. 



P. reptans L. Thickets and open woods, locally throughout 111. May-June. 



132. Hydrophyllaceah Lindl. — Waterleaf Family 



1 . Leaves not entire. 



2. Flowers solitary; stamens included I. Ellisia 



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. H^drophvllum 



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. PhacAia 



1 . Leaves entire 4. HvJrolea 



1. Ellisia L. 



E. nyctelea L. Woods, thickets, cult, ground, and waste places, common 

 throughout 111. May. 



2. Hydrophyllum L. — Waterleaf 



1. Leaves pinnately divided; calyx without appendages between the lobes; 



plants perennial. 



2. Stem glabrous or strigilose; leaf-segments 5-7, acuminate; calyx-lobes 



linear, strigilose on the back, ciliate; corolla pale lavender; moist woods, 



common. May-June H. virgiuianum L. 



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



late, short-pubescent, and hispidulous; corolla white; woods, local. May- 

 June H. macrophylltim Nutt. 



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



3. Pedicels glabrous or nearly so; calyx-appendages minute or none; corolla 



white; plants perennial; woods, local. June-July H. canadetisc L. 



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

 (1-2 mm. long) between the lobes; corolla lavender; plants biennial; 

 woods, common. May- June. [^Decemnim appendicidatuvi (Michx.) 

 Brand] M. appendiadalnui Michx. 



