Ol'd. 1.] SYNGENESIA POLYGAMIA ^QUALIS. 157 



pricklv scales. Down stalked. Leaves wavy. — Helminthia ech. 



Br. Fl. 



Hedges and fields, on a clay soil. 0. 6, 7. Bristly. FL goldenyell. 



2. P. hieracioides, 3. 19G. (Haukweed O.) Outer calyx of numerous 



scales, much shorter than the inner. Leaves lanceolate, wavy ; 



radical ones toothed. Down sessile. Stem rough. 



Dry gravelly or chalky soil. $ . 7, 8. Bough, dark green. Fl. yell. 



372. SoNCHUS. Sow-thistle. 



1. S. caruleus, 34. 2425. (Blue S.) Flower-stalks and calyx bristly, 



racemose. Leaves somewhat Ivratc ; their terminal lobes trian- 

 gular and very large. — S. alpinus, Br. FL 

 Mts. of Aberdeensh. and Clova. If. 7, 8. FL large. Cal. brown. 

 Cor. fine blue. 



2. S.palustris, 13. 935. (Marsh S.) Flower-stalks and calyx bristly, 



somewhat umbellate. Leaves runcinate, rough-edged ; arrow- 

 shaped at the base. 

 Marshes, very rare. If.. 7, 8. 6 — 8^! Cal. black. Cor. lemon-col. 



3. S. arvensis, 10. 674. (Corn S.) Flower-stalks and calyx bristly, 



somewhat umbellate. Leaves runcinate, finely toothed, heart- 

 shaped at the base. Root creeping. 

 Fields, on a clay soil. If. 8. 3 — 4 f. Cal. black. Cor. large, deep yell. 



4. S. oleraceus, 12. 843. (Common S.) Flower-stalks cottony. Calyx 



smooth. Leaves runcinate, toothed. — /J. asper. Leaves with 

 rounded auricles, lower ones sessile. Fruit ribbed. S. asper, 

 Suppl. 2765 and 2766. 

 Waste and cult. gr. . 7 — 9. Varying much. Cal. green. Cor. yell. 



373. LACTuCA. Lettuce. 



1. L. virosa, 28. 1957. (Strong-scented L.) Leaves horizontal, finely 



toothed ; the keel prickly. 

 Chalky banks. $ . 8, 9. Dark green, juicy, fetid. Fl. small, pale yell. 



2. L. Scariola, 4. 268. (Prickly L.) Leaves perpendicular, sinuated, 



finely toothed ; the keel prickly. 

 Waste gr. rare. $ . 8. Glauc. milky, less fetid. Fl. small, lemon-col. 



3. L. saligna, 10. 707. (Least L.) Leaves linear; hastate or pinna- 



tifid, entire, sessile ; the keel prickly. 

 Waste chalky gr. $ .8. Slender. Stem wavy, 2 f. L. glauc. Fl.yell. 



374. PRENaNTHES. Wall-lettuce. 

 1. P. muralis, 7.457. (Ivy-leaved W.) Florets 5. Leaves runcinate. 

 Walls, or woods, on a chalky soil. If. 7. Smooth, brittle. Fl.yell. 



375. LE6NTODON. Dandelion. 



1. L. Taraxacum, 8. 510. (Common D.) Outer scales of the calyx 



reflexed. Leaves runcinate, toothed, smooth. 

 Mead, and past. If. 4 — 7. Leaves a perfect exampleofthe runcinate 

 form. Fl. solitary, large, yellow. 



2. L. patustre,8.553. (Marsh D.) Outer scales of the calyx shorter, 



imbricated, ovate. Leaves sinuated and toothed, not quite smooth. 



