Plants not acid; flowers monœcious. 3. Lower leaves broadly cordate, ob tuse; one sepal usually with a tubercle alpinus. Flowers hermaphrodite. One or more of the sepals with a tubercle. Sepals entire or very obscurely toothed. Whorls of flowers numerous and crowded. 4. Sepals with prominent veins Hydrolapathum. 5. Leaves waved and crisped at the edges crispus. Whorls distant. 6. Leaves with red or green veins ; whorls generally on leafless branches sanguineus. 7. Whorls leafy; all the sepals tu bercled Sepals toothed. Sepals with bristly teeth. 8. Flowers crowded, golden; leaves acute 9. Flowers more distant Teeth of the sepals not setaceous. Leaves obtuse. 10. Lower leaves cordate, or fiddle- 11. Lower leaves ovate-cordate Leaves oblong-lanceolate. conglomeratus. maritimus. pulcher. obtusifolius. 12. Sepal-teeth small and triangular . pratensis. Sepals all without tubercles, entire. 13. Very near crispus aquaticus. I. R. Acetosa. Common S.-2. R. Acetosella. Sheep's S. 3. R. alpinus. Alpine D. or Monk's Rhubarb.-4. R. Hydrolapathum. aquaticus (Smith). Great Water D.-5. R. crispus. Curled D.-6. R. sanguineus. viridis. Nemolapathum. Blood-veined and Green-veined D.-7. R. conglomeratus. acutus. paludosus. Sharp D.-8. R. maritimus. Golden D.-9. R. palustris. Yellow Marsh D.-10. R. pulcher. Fiddle D.-11. R. obtusifolius. Broad-leaved D.12. R. pratensis. Meadow D.-13. R. aquaticus. Grain less Water D. 3. Flower-stalks smooth; stipules short- Persicaria. lapathifolium. Hydropiper. 4. Spike dense, rose-coloured. Perennial amphibium Styles 3. Flowers axillary (sometimes lateral too). Stems twining (flowers racemose). 5. Fruit opaque, with minute points 6. Fruit smooth and shining Stem not twining. Flowers in panicles. 7. Leaves cordate-sagittate Flowers in racemes. Convolvulus. dumetorum. Fagopyrum. Fruit smooth, longer than the perianth. 8. Leaves crowded; stipules as long as 9. Leaves distant; stipules much shorter . maritimum. Roberti. Fruit rough, not longer than the perianth. Flowers terminal. 11. Racemes dense; lower leaves with a 12. Spikes lax; with little reddish bulbs aviculare. Bistorta. viviparum. 1. P. Persicaria. Spotted Persicaria. incanum.-2. P. lapathifolium. Pale-flowered P. laxum. pallidum.-3. P. Hydropiper. Biting P. minus. mite.-4. P. amphibium. Amphibious P.-5. P. Convolvulus. Climbing B. or Black *Sometimes specimens of P. Persicaria and P. Hydropiper have 3 styles. Bindweed.-6. P. dumetorum. Copse B.-7. P. Fagopyrum. Common B. or Brank.-8. P. maritimum Sea-side K.9. P. Roberti. Robert's K. Raii. - 10. P. aviculare. Common K.-11. P. Bistorta. Common B. or Snakeweed. 12. P. viviparum. Viviparous alpine B. Leaves opposite; capsule many-seeded. 6. Styles usually 3; capsule-valves al- GEN. I. 1. I. verticillatum. GEN. II. ILLECEBRUM. Spergula. Spergularia. KNOT-GRASS. Whorled K. Flowers whorled. HERNIARIA. RUPTURE-WORT. 1. H. glabra. Glabrous R. Leaves lanceolate. GEN. III. POLYCARPON. ALL-SEED. 1. P. tetraphyllum. Four-leaved A. Stem-leaves usually in fours. GEN. IV. CORRIGIOLA. STRAPWORT. 1. C. littoralis. Sand S. Leaves fleshy and very glaucous. GEN. V. SPERGULA. SPURREY. 2. S. arvensis. Corn S. Leaves awl-shaped; flowers panicled. GEN. VI. SPERGULARIA. SANDWORT-SPURREY. 1. S. rubra, Field S. Flowers numerous, solitary. marina. XV. CHENOPODIACEÆ. A. Some of the flowers diclinous. 1. Calyx 5-partite, or of 2 valves, or B. Flowers perfect. 2. Stem jointed; stamens 1-2. Stem not jointed. Atriplex. Salicornia. Beta. 4. Leaves flat; flowers without bracts Chenopodium. 5. Leaves spinous; calyx becoming 6. Calyx not winged; stigmas usually Salsola. Suæda. GEN. I. ATRIPLEX. ORACHE. 1. A. laciniata. Frosted Sea O. ters; whole plant hoary. Flowers in axillary clus rosea. 2. A, pedunculata. Stalked Sea O. Plant mealy; leaves en tire; calyx of the female flowers on long stalks, 3-lobed, the 2 lateral lobes largest. I. Leaves not lobed, nearly entire. 3. A. portulacoides. Shrubby O., or Sea Purslane. shrubby; leaves silvery-white. Stem 4. A. littoralis. Grass-leaved Sea O. Stem herbaceous; the undersides of the leaves and the flowers mealy. marina. II. Lower leaves lobed. 5. A. patula. Spreading O. Leaves triangular-lanceolate, somewhat halbert-shaped. Babingtoni. deltoidea. angustifolia. hastata. GEN. II. SALICORNIA. GLASSWORT. 1. S. herbacea. Jointed G. Stem herbaceous. annua. procumbens. 2. S. radicans. Creeping G. Stem woody, procumbent, and rooting. fruticosa. GEN. III. BETA. BEET. 1. B. maritima. Sea B. Flowers greenish. vulgaris. GEN. IV. CHENOPODIUM. GOOSE-FOOT. A. Leaves undivided, entire. 1. C. olidum. Stinking G. Leaves small, greasy, mealy, when bruised smelling like putrid fish. 2. C. polyspermum. Many-seeded G. Leaves ovate, obtuse. 3. C. acutifolium. Leaves acute. B. Leaves angular, toothed, or lobed. 4. C. Bonus Henricus. Mercury G., or Good King Henry. Leaves dark-green, triangular, arrow-shaped, entire. 5. C. album. White G. Leaves mealy, ovate, toothed; spikes somewhat leafy. 6. C. viride. Green G. Leaves green, ovate, nearly entire. 7. C. hybridum. Maple-leaved G. Leaves sub-cordate, with 1 or 2 broad angular teeth. 8. C murale. Nettle-leaved G. Leaves shining, ovate, sharply toothed. 9. C. urbicum. Upright G. Leaves light-green, triangular, sharply toothed; spikes long, erect. intermedium. 10. C. ficifolium. Fig-leaved G. Leaves waved, jagged, somewhat hastate; the upper ones entire. serotinum. 11. C. glaucum. Oak-leaved G. Leaves oblong, waved, glaucous and mealy beneath; spikes mealy, leafless. 12. C. rubrum. Red G. Leaves triangular, toothed; spikes thick, erect; stem often reddish. 1. S. Kali. Prickly S. Three leaf-like bracts to each flower; leaves awl-shaped. GEN. VI. SUÆDA. SEA-BLITE. 1. S. fruticosa. Shrubby S. Styles 3; stem erect, shrubby. Chenopodium. 2. S. maritima. Annual S. Styles 2; stem diffuse, herba ceous. Chenopodium. D |