SYNGEN. POLYGAM. .EGlUAL. 227 



3. S. ohraceus {common Sow-thistle), peduncles subtomentose 

 umbellate, involucre glabrous, leaves runcinate dentato-ciliate 

 aniplexicaul at the base. Light f. p. 428. E. B. t. 843. 



Hab. Waste places and cultivated ground, common. Fl. June, Aug. 



O- 

 Two to three feet high. Flowers rather small, yellow, occasionally 

 white, according to Mr. Hopkirk. 



4. LACTUCA. 



1. L. virosa {strong-scented Lettuce) y leaves oblong toothed ho- 

 rizontal their keel prickly their apex obtuse. LightJ'.p. 429, 

 E.B. t. 1957. 



Hab. Banks and way-sides,, but rare. Foot of Arthur's Seat, Edinb., 

 Light/. Dunkeld, Mr. Murray. FL Aug. ^ , 



Stem 3 — 4 feet high, erect, prickly, with distant leaves, panicled at 

 the summit. Leaves finely toothed, embracing the stem j radical 

 ones numerous, obovate. — Abounding with a milky and narcotic 

 juice, which has been considered by some as a gentle and safe opiate. 

 Flowers small, yellow, 



5. PRENANTHES. 



1. Pr. muralis {Ivy-leaved Lettuce), florets 5, leaves lyrato-pin- 



natifid and toothed, the terminal lobe with about 5 angles, 



Lightf.p.A?>\. E.B.t.457. 

 Hab. On shady rocks and walls of old castles in the Lowlands, Light/. 



Fl. July. 1/ , 

 Stem two feet high, panicled at the top, with the branches spreading. 



Flowers small, yellow, 



6. LEONTODON. 



1. L. Taraxacum {Dandelion), outer scales of the involucre re- 

 flexed, leaves runcinate glabrous toothed. LightJ'.p. 432. 

 E.B.t.5\{). 



Hab. Meadows and pastures, abundant, Fl. in the summer, 1/ . 

 Leaves all radical, their segments more or less deep. Scape with a 

 large single flower, 



2. L. palustre {Marsh Dandelion), outer scales of the involucre 

 erect appressed, leaves sinuate-dentate nearly glabrous. E. B, 

 ^.553. 



Hab. Pentland hills, Mr. Maughan. Ros-slyn woods, also bogs near 

 Edinb., Mr. Greville. Marshes, Angus-shire, Mr. G. Don. Wet 

 moors about Glasg., not uncommon, Hopkirk. Fl. June, July, 1/ . 



Very nearly allied to the preceding, and was for a long time, perhaps 

 justly, considered as merely a var, of it, 



7. APARGIA, 

 1 . A. hispida {rough Apargia), scape single-flowered, leaves den- 

 tate scabrous, "florets hairy at their orifice glandular at the 



q2 



