DICOTYLEDONS. LABIAT.^. Thljmus. 21/ 



2. S. ambigua^ whorls of 6 flowers, leaves oblongo-cordate acute 

 petiolate, stem hollow. (Sm.) p. IS3.— Fields. 



3. S. paluslris, whorls of 6 flowers, leaves linear-lanceolate semi- 

 ainplexicaul. p. 183. — Marshes. 



4. S. arvensh, whorls of 6 flowers, stem weak, leaves heart-shaped 

 obtuse crenate slightly hairy, cor. scarcely longer than the cal. 

 p. 183. — Corn-fields. 



13. BALLOTA, 



Cal. with 10 ribs and 5 teeth. Upper lip of the Cor. concave, 

 notched ; lov.er one trifid ; middle lobe the largest, emarginate. 



1. B. nigra, leaves ovate undivided serrated, calyces dilated up- 

 wards subtruncated, the teeth patent. {Sm.) p. 184. — Waste 



places. 



1 1. MARRUBIUM. 



Cal. with 10 ribs and 5 or 10 spreading teeth. Upper lip of the 

 Cor. cloven, linear, straight; lower one trifid; middle segment 

 the largest, emarginate. 



1. M. vuls,are, stem erect, leaves roundish ovate toothed wrinkled, 

 cal. with 10 setaceous hooked teeth, p. 184. — Waste places. 



15. LEONUIIUS. 



Cal. with 5 angles. Upper lip very hairy above, entire ; lower 



one reflexed, 3-partite. Anthers sprinkled with shining dots. 

 1. L. Cardiaca, leaves petiolate, the lower ones crenato-lanceolate 



3-lobed, upper ones entire, p. 184. — Among rubbish. 



Sect. 11. Calyx 2-lipped. 

 IG. CLINOPODIUM. 

 Involucre (bracteas of many linear-acuminate leaflets placed un- 

 der the cal. Upper lip "of the cor. erect, emarginate ; lower 

 one the largest, emarginate. 

 1. CI. vtilsare, leaves ovate obscurely serrated, whorls hairy, 

 bracteassetaceous, pedicels branched, p. 184. — Banks. 



17. ORIGANUM. 

 Calyces collected, by imbricated bracteas, into a spicate, qua- 

 drangular cone. Upper lip of the cor. straight, notched ; the 

 lower one in 3 nearly equal lobes. 

 1. O. vulgare, spikes roundish panicled conglomerate glabrous, 

 bracteas ovate longer than the cal., leaves ovate entire, p. 185. 

 — Bushy places, 



18. THYMUS. 



Cal. closed with hairs at the mouth. Cor. shortly 2-lipped ; upper 

 pfje notched ; the lower one the largest, .•^ubeniaiginiue. 



