308 SYNGENESIA POLYGAMIA JEQTJALIS. [CL. XIX. 



compressed : seed-down hair-like, stalked. Receptacle naked, 

 dotted. Name, from lac, milk, on account of its white juice. 369. 



1. L. tii-iiso. Strong-scented Lettuce. Leaves horizontal, toothed ; 



their keel prickly. Stem two or three feet high, erect, round, smooth : 



root-leaves numerous, inversely egg-shaped, stem-leaves smaller, fre- 

 quently lobed, arrow-shaped and embracing at the base : flowers nume- 

 rous, pale-yellow, panicled. The whole plant abounds with an acrid 

 milky juice, having the narcotic properties of opium. Biennial: flowers 

 in August and September : grows in borders of fields and about hedges 

 and old walls: frequent in England, rare in Scotland. Eng. Bot. 

 vol. xxviii. pi. 1957. Eng. Fl. vol. iii. p. 345. 1113. 



2. L. Scariola. Prickly Lettuce. Leaves perpendicular, sinuated, 



finely toothed, their keel prickly. Stem two or three feet high, erect, 



panicled: leaves variously pinnatifid and sinuate: flowers pale-yellow. 

 It abounds in acrid milky fluid like the last. Perennial : flowers in 

 August: grows in waste ground and the borders of fields, in Essex and 

 Cambridge. Eng. Bot. vol. iv. pi. 268. Eng. Fl. vol. iii. p. 346. 1114. 



3. L. satigna. Least Lettuce. Leaves linear, halbert-shaped, sessile, 



their keel prickly. Stem two feet high, waved : leaves embracing the 



stem : flowers pale-yellow : milky. Biennial : flowers in August : grows 

 in waste ground near salt marshes, in the south-east of England : rare. 

 Eng. Bot. vol. x. pi. 707. Eng. Ft. vol. iii. p. 347. 1115. 



5. PRENA'NTHES. WALL-LETTUCE. 



Common calyx cylindrical, double ; the inner of as many 

 linear, equal scales as there are florets ; the outer of a few, very 

 short, unequal scales. Compound corolla of a single row of per- 

 fect, equal, strap-shaped, abrupt, four or five-toothed florets. 

 Filaments five, hair-like, very short; anthers united into a slender 

 cylindrical tube. Germens oblong. Style hair-like, longer than 

 the stamens; stigmas two, revolute. Seeds oblong, furrowed : 

 seed-down hair-like, roughish, sessile. Receptacle naked, very 

 narrow. Name, from prenes, drooping, and anthos, a flower. 



370. 



1. P. murdlis. Ivy-leared Wall-lettuce. Florets five; leaves run- 

 cinate. Stem a foot high, round, hollow, panicled above : leaves em- 

 bracing the stem : flowers erect, bright-yellow, with a purplish calyx. 

 Perennial: flowers in July: grows on old walls and rocks: common. 

 Eng. Bot. vol . vii. pi. 457. Eng. Fl. vol. iii. p. 348. 1116. 



6. LEO'NTODON. DANDELION. 



Common calyx oblong, double; the inner of several linear, 

 equal, parallel scales ; the outer of fewer and shorter ones. Coin- 

 pound corolla of very numerous, imbricated, equal, perfect, .strap- 

 shaped, abrupt, five-toothed florets. Filaments hair-like, short; 

 anthers united into a cylindrical tube. Germen inversely egg- 

 shaped, furrowed. Style cylindrical, longer than the stamens ; 

 stigmas two, revolute. Seed inversely egg-shaped, furrowed ; 

 seed-down in hair-like rays, on a long cylindrical stalk. Rtcep- 



