LOBELIACEJE. (LOBELIA FA3IILT.) 241 



# * Pappus tawny : corolla pale blue, or cream<olor turning bluish. 

 3. M. Ieucopb%um, DC. Nearly smooth ; stem tall (3° -12° high), 

 very leafy ; leaves irregularly pinnatifid, sometimes runcinate, coarsely toothed, 

 the uppermost often undivided ; heads in a large and dense compound panicle 

 (2) — Low grounds ; common. Aug. — Lower leaves often 1° long. 



M. pulchellum, Nutt., of the plains of the Northwest, is to be expected in 

 Wisconsin. 



§3. SONCHUS, L. Sow-Thistle. 



Heads many-flowered, becoming tumid at the base. Involucre more or less 

 imbricated. Achenia flattened laterally, ribbed or striate, not beaked. Pappus 

 copious, of very white exceedingly soft and fine capillary bristles. — Leafy- 

 Btemmed weeds, chiefly smooth and glaucous, with corymbed or umbellate 

 heads of yellow flowers. (The ancient Greek name.) 



* Annual : flowers pale yelloic. 



1. S. olerAceos, L. (Common Sow-Thistle.) Stem-leaves runcinate- 

 pinnatifid, or rarely undivided, slightly toothed with soft spiny teeth, clasping 

 by a heart-shaped base, the auricles acute ; involucre downy when young ; ache- 

 nia striate, wrinkled transversely. — Waste places in manured soil and around 

 dwellings. (Nat. from Eu.) 



2. S. Asper, Vill. (Spiny-leaved Sow-Thistle.) Stem-leaves mostly 

 undivided, conspicuously spiny-toothed, the auricles of the clasping base round- 

 ed; achenia margined, 3-nerved on each side, smooth. — Waste places, like the last, 

 and much resembling it. (Nat. from Eu.) 



# * Perennial : flowers bright yelloic. (Heads large.) 



3. S. akvensis, L. (Corn Sow-Thistle.) Leaves runcinate-pinnatifid, 

 6piny-toothed, clasping by a heart-shaped base, the auricles obtuse ; peduncles 

 and involucre bristly; achenia transversely wrinkled on the ribs. — Essex 

 County, Massachusetts, Staten Island, and New Jersey: rare. Sept. (Adv. 

 from Eu.) Cayuga Lake, A ■. New York, If. B. Lord. 



Ordkr 60. LOBELIACEjE. (Lobelia Family.) 



Herbs, with milky juice, alternate leaves, and scattered flowers, an irregular 

 monopcfalous 5-lobed corolla split dozen to the base on one side ; the 5 stamens 

 free from the corolla, and united into a tube commonly by their filaments and 

 always by (heir anthers. — Calyx-tube adherent to the many-seeded pod. 

 Style 1 : stigma fringed. Seeds anatropous, with a small straight embryo, 

 in copious albumen. — A family of acrid poisonous plants, represented only 

 by the genus 



1. LOBELIA, L. Lobelia. 



Calyx 5-cleft, wjth a short tube. Corolla with a straight tube, split down on 

 the upper side, somewhat 2-lipped ; the upper lip of 2 rather erect lobes, the 

 lower spreading and 3-cleft. Two of the anthers in our species bearded at the 

 21 



