SPECIES AND VARIETIES. 381 



florets yellow. A. very variable plant. Woods, banks, and 

 walls. Fl. July to September. 



H. boreale : stem erect, scabrous, 12 feet, hispid below, 

 leafy, slightly -branched and corymbose above ; leaves ovate- 

 lanceolate or lanceolate, sinuate-dentate or nearly entire, the 

 lower ones narrowed into a dilated petiole, the upper sessile 

 with a rounded base, the uppermost small ; radical leaves 

 evanescent ; corymb irregular ; involucral scales with a slightly 

 hispid keel ; florets yellow. Thickets. Fl. August, Septem- 

 ber. 



(38) Sonchus. SOW-THISTLE. 



S. arvensis : stem 34 feet high, simple, leafy ; leaves long, 

 acute, lanceolate, runcinate, finely-toothed, cordate at the base, 

 the uppermost entire ; heads corymbose, large ; florets yellow ; 

 involucre and peduncles glandular- hairy ; root creeping. 

 Cornfields. Fl. August, September. 



S. palustris : stem 4-6 feet high, simple, leafy ; leaves 

 linear-lanceolate, the lower runcinate, the upper simple, all 

 arrow-shaped, spinosely-ciliated, with acute auricles; heads 

 corymbose ; florets lemon-coloured ; involucre and peduncles 

 glandular-hairy; root without scions. Marshes, rare. Fl. 

 July to September. 



(39) Arbutus. 



A. Unedo : an evergreen tree, with rough bark ; leaves 

 elliptic-lanceolate, serrated, coriaceous, glabrous ; panicle ter- 

 minal, nodding, pedicels glabrous, the flowers whitish, pendu- 

 lous ; fruit globular, granulated, red, resembling a strawberry, 

 but dry and flavourless. Strawberry Tree. Lakes of Kil- 

 larney. Fl. September, October. 



