212 45. COMPOSITJB. 



bristles, 1. linear or lanceolate dentate or sinuate, upper 1. some- 

 what clasping, heads solitary terminating the stem and branches, 

 outer phyU. lax oblong bristly on the keel glabi-ous on the mar- 

 gin, fr. constricted just below the pappus. — E. S. 198. — St. 1 — 

 3 feet high, divaricately branched above, irregularly corymbose, 

 very rough. Florets yellow. — P. arvalis (Jord.) with branches 

 ascending and heads in an umbellate corymb passes gradually 

 into the type. — Dry banks. B. VII. — IX. E. 



41. Helmih'thia Juss. Ox-tongue. 



1. H. echioides (Gaert.) ; st. erect hispid with rigid 3-fid and 

 hooked hairs from tiibercidar bases, phyll. 5 ovate-cordate. — 

 E. B. 972. — St. '2 — 3 feet high, branched, covered, as well as 

 the leaves and involucre, with strong prickles springing from 

 white tubercles and with 3 minute hooks at the apex (glochi- 

 date). L. clasping.— Dry banks. A. VII.— IX. B. I. 



E. JReceptacle generally without scales. Pappus filiform, decidu- 

 ous, never feathery , nor dilated at the base. Fruit compressed. 



42. Lacttj'ca Linn. Lettuce. 

 * Beak long, white. Leaves with a bristly heel. 



1. L. salig'na (L.) ; upper I. linear entire acuminate with a 

 sagittate base, lower 1. pinnatifid, beak twice as long as the fruit. 

 — E. B. 707. — St. 2 feet high, slender, wavy, slightly branched. 

 Heads in small alternate tufts forming long clusters. Flowers 

 yellow. — Chalky places and near the sea. B. VII. VIII. E. 



2. L. vir6sa (L.) ; upper I. horizontal oblong auricled and 

 clasping mucronate-dentate or sinuate, beak equalling the black 

 fruit. — E. B. 1957. — St. scabrous, 2 — 4 feet high, leafy, branched 

 above, panicled. Heads scattered, with many heaitshaped acute 

 bracts. Plant full of acrid milky juice. — Dry banks. B. VII. 

 VIII. Aa-id Lettuce. E. S. 



3. L. Scariola (L.) ; upper I. upright arrowshaped at the base 

 and clasping sinuate, beak equalling the pale fruit. — E. B. 268. — 

 St. slightly scabrous below, 2 — 5 feet high, leafy, panicled. 

 Heads scattered, with many heartshaped acute bracts. Juice 

 rather less acrid than in Sp. 2. — ^Waste places, rare. B. VII. 

 VUI. Prickly Lettuce. E. 



** Beak short. Leaves with a smooth keel. 



4. L. murdlis (DC.) ; florets 5, 1. lyrate-runcinate angled and 



