64 American Midland Naturalist Monograph No. 7 



2. Helianthemum Mill. — Frostweed 

 1. PetaliferoLis flowers 5-12, pale yellow, in a short terminal cymose 

 raceme, their capsules 3-5 mm in diameter; seeds reticulate; 

 sandy soil in open woods, local. June- July. [H. rnajus sensu 



Bickn., non (L.) BSP.] H. bicknellii Fern. 



1 . Petalif erous flowers solitaiy ( or rarely 2 ) , bright yellow, their 

 capsules 6-9 mm in diameter; seeds papillose; in similar hab- 

 itats. June. [Lechea major L. ; Cistus canadensis L. ; H. majus 

 (L.) BSP.] _.... ...H. canadense (L.) Michx. 



3. Lechea L. — Pinweed 



1. Stem with spreading (villous) pubescence; leaves of the basal 

 shoots oval; stem leaves oval, 10-25 mm long, 6-12 mm wide; 



sandy soil. July-Aug L. villosa Ell. 



1. Stem with appressed (strigose) pubescence, or sometimes nearly 

 glabrous. 

 2. The narrow outer sepals equalling or exceeding the inner ones. 

 3. Stems 25-70 cm tall; leaves narrowly elliptical; sandy soil. 

 July-Aug L. minor L. 



3. Stems usually 10-20 cm tall; leaves linear; sandy or sterile 



soil in woods. July-Aug. [L. tenuifolia var. occidentalis 



Hodgdon] L. tenuifolia Miclix. 



2. The narrow outer sepals shorter than or equalling the inner 

 ones. 



4. Plants pale green, finely canescent; panicle strict, virgate; 



sandy soil; n. 111. July-Aug L. stricta Leggett 



4. Plants dark green, more or less pubescent, but not canescent. 



5. Panicle strict, virgate; capsules globose, 2-3 mm in diam- 



eter; sandy soil, rare. July-Aug. L. intermedia Leggett 



5. Panicle-branches spreading; capsules ellipsoid, 1-1.5 mm in 

 diameter; sandy soil, known from Cook, Iroquois, 

 Kankakee, Lake, Will, and Winnebago counties. Jvily- 

 Aug. [L. juonilijormis Bickn. J ...L. leggettii Britt. & Hollick 



13. Papaveraceae B. Juss. — Poppy Family 



1. Flowers white or whitish. 



2. Petals none; sepals 2, cream-colored 1. Macleaya 



2. Petals 4-15, white; sepals 2 or 3. 



3. Petals usually 8 or more, fugacious; leaves prickly; juice red 



2. Sanguinaria 



3. Petals 4-6: leaves with prickly teeth; juice yellow 3. Argemone 



1. Flowers not white. 



4. Leaves ternately dissected; capsules long and slender 4. Eschscholtzia 



4. Leaves pinnatifid; capsules linear, ovoid, or ellipsoid. 



5. Leaves prickly; capsules ellipsoid, prickly 3. Argemone 



5. Leaves not prickly; capsules not ellipsoid, glabrous or bristly-hirsute. 



6. Flowers yellow; leaves pinnatifid; capsules dehiscent from the base; 



juice yellow. 



