SUMMARY. xi 



two-toothed. Corolla monopetalous, hypogynous, irregular ; upper, 

 lip nearly entire, and arched ; lower one three-lobed. Stamens four, 

 ascending, parallel; filaments divided into two near their summits, 

 and one only bearing anther. Ovary one, four-lobed. Style arising 

 from between the lobes, bifid. Stigma two-lobed. Achenes four, 

 within calyx, a solitary seed in each. Flowers in dense whorls, brac- 

 tate. Leaves opposite, stalked, ovate, ordinarily entire. Stem 

 square. Moist pastures. July, August. Perennial. 



CHARLOCK, SINAPIS AEVENSIS. Nat. Ord., Cruciferce. 

 of four linear, spreading, blunt, and hairy sepals. Corolla of four 

 obcordate, clawed, spreading, yellow petals. Stamens six, two being 

 shorter than the others ; filaments yellow, tapering. Stigma capitate. 

 Seed-vessel a two-valved, glabrous, many-seeded, and beaked pod. 

 Leaves on foot-stalks, spreading, alternate, rough, serrate; upper 

 ones ovate-lanceolate; lower ones lobed at base. Stem upright, 

 branched, round, solid, hispid. Root simple, fibrous. Cornfields and 

 amongst crops. May, June, July. Annual. 



SMALL WILLOW-HERB, EPILOBIUM MONTANUM. Nat. 

 Ord., Onagracece. Calyx-tube adnate with ovary, deciduous, limb 

 divided nearly to base. Corolla of four petals, regular, pink, deeply 

 notched. Stamens eight, inserted in calyx, erect. Style filiform. 

 Stigma four-lobed. Capsule slender, four-celled, four-valved, many- 

 seeded ; seeds tufted. Leaves on short stalks, ovate, toothed, glabrous. 

 Stem erect, simple, or very slightly branched. Banks, roofs, and 

 walls. June, July. Perennial. 



FEVERFEW, MATBICABIA PARTHENIUM. Nat. Ord., Composite 

 Flower-heads pedunculate, inflorescence corymbose and terminal. 

 Involucre hemispherical, scales membranous, imbricated, villous. 

 Disk-florets tubular, numerous, perfect, yellow, five-toothed. Ray- 

 florets pistilliferous, white. Stamens five; filaments very short; 

 anthers forming a tube. Ovary angular. Style short, filiform. Stigma 

 bifid, spreading. Fruit an achene, angular, furrowed, crowned with 

 toothed disk. Leaves petiolate, alternate, light green, bi-pinnate, 

 segments ovate. Stem erect, smooth, branched. Root thick, branch- 



