2. Barbare'a

R. Br. Winter Cress. B. vulga'ris, R. Br. (Yellow Rocket.) Stem smooth, 1-3 feet high. Lower leaves lyrate, the terminal division round and generally large, and 1-5 pairs of lateral ones (the latter sometimes absent); upper leaves obovate, more or less pinnatifid at the base. Pods linear, erect, or slightly spreading. In var. stricta, a common form in the North-West, the pods are appressed. - Low grounds.

3. Vesicaria

Lam. Bladder-pod. V. Ludovieia'na, DC. (Western Bladder-pod.) (Lesque-rella Ludoviciana, Watson, var. arenosa, Watson.) Stem low, simple, or somewhat branched above. Flowers large. Radical leaves spathulate, entire; stem-leaves linear. Pods hairy, globose, rather longer than the style. - N. W.

4. Dentaria. L. Toothwort. Pepper-root

1. D. diphyl'la, L. (Two-leaved T.) Flowers white. Stem-leaves 2, nearly opposite, ternately divided. Root-stock toothed, pleasantly pungent to the taste. - Rich woods.

2. D. laeiniata, Muhl. (Laciniate T.) Flowers purplish. Stem-leaves 3, in a whorl. Root-stock jointed, scarcely toothed. - Rich woods.

5. Cardam'ine. L. Bitter Cress

1. C. rhomboi'dea, DC. (Spring Cress.) Flowers white or (in var. purpurea) rose-purple. Stem tuberous at the base. Lower leaves round-cordate; upper nearly lanceolate; all somewhat angled or toothed. - Wet meadows.

2. C. pratensis, L. (Cuckoo-Flower. Ladies' Smock.) Flowers white or rose-colour, showy. Stem from a short root-stock. Leaves pinnate, leaflets 7-15, those of the lower leaves rounded and stalked, entire or nearly so. - Bogs.

3. C. hirsuta", L. (Small Bitter Cress.) Flowers white, small. Root fibrous. Leaves pinnate, leaflets 5-11, the terminal leaflets largest. Pods erect, slender. - Wet places.

6. Ar'abis

L. Rock Cress. * Seeds in one row in each cell, nearly as broad as the partition.

1. A. lyrata, L. (Low P.) Flowers white, petals twice as long as the calyx. Stem branching from the base. Radical leaves clustered, pinnatifid, the terminal lobe largest; stem-leaves scattered, linear, with tapering base. Pods slender, erect, and spreading. - Rocky or sandy shores.

2. A. hirsuta, Scop. (Hairy E.) Flowers greenish-white, small, petals slightly longer than the calyx. Stem-leaves many, rough, sagittate; often a dense rosette at the base of the stem. Pods erect, straight. Stems 1-2 feet high, 2 or 3 from the same root. - Rocky shores and dry plains.

. A. laevigata, DC. (Smooth P.) Flowers white, rather small. Leaves linear or lanceolate, entire or slightly toothed, sagittate, clasping. Pods long and narrow, recurved-spread-ing. Stem glaucous, 1-2 feet high. - Dry hill-sides. Easily recognized by the pods.

4. A. Canadensis, L. (Sickle-pod.) Flowers whitish, with linear petals, about twice the length of the calyx. Stem-leaves pointed at both ends, downy, the lower ones toothed. Pods 2-3 inches long, scythe-shaped, hanging. Stem 2 3 feet high. A striking plant when the pods are fully formed. - Dry woods and ravines.

5. A. petrae'a, Lam. Petals rose-colour or whitish. Pods shorter and less flat than A. lyrata. Leaves spathulate or oblong, entire or sparingly toothed. - Rocks; reported from New Brunswick.

* * Seeds in two distinct rows in each cell, narrower than the partition.

6. A. perfoliata, Lam. (Tower Mustard). Flowers yellowish-white. Petals scarcely longer than the calyx.

Stem 2-4 feet high, glaucous. Cauline leaves ovate-lanceolate or oblong, clasping with sagittate base. Pods long and very narrow, on erect pedicels. - Meadows and old fields. Pretty easily recognized by its strict habit.

7. A. eonfi'nis, Watson. {A. Drummondii, Gray.) Flowers white or rose-colour. Petals twice as long as the calyx. Stem 1-2 feet high, smooth above. Cauline leaves lanceolate or oblong-linear, with sagittate base; lowest leaves spathulate and toothed. Pods long and flat; the pedicels not so strictly erect as in the last species. - Rocky banks of streams.

8. A. Holboel lii, Hornem. Petals white or rose-colour, occasionally purplish, becoming reflexed, twice as long as the sepals. Stem 6-24 inches high, usually simple, more or less hairy. Lowest leaves small, spathulate, somewhat toothed, with margined petioles; upper sessile, sagittate, linear-lanceolate. Pods reflexed. Style none. - N. W.

7. Erys'imum, L. Treacle Mustard.

1. E. eheiranthoi'des, L. (Worm-seed Mustard.) Flowers yellow, inconspicuous. Stem slender, branching. Leaves lanceolate, scarcely toothed, roughish with appressed pubescence. Pods small and short, on slender diverging pedicels. - Waste wet places.

2. E. as'perum, DC. (Prairie Rocket.) Flowers showy, bright orange-yellow, rarely purple. Stem stout, 1-2 feet high, simple, hoary, with minute appressed hairs. Leaves oblanceolate. Pods long, ascending on stout spreading pedicels. - Dry soil, N. W.

3. E. parviflo'rum, Nutt. Stem low and simple, hoary. Leaves all linear, densely clustered at the base of the stem. Flowers small, sulphur-yellow. Pods long, narrow, ascending, on short pedicels. - N. W.

4. E. orienta'le, R.Br. Stem slender and branching, 1-2 feet high. Leaves grayish-green, oblong to oval, slightly clasping; radical ones spathulate. Flowers pale yellow or cream-coloured, small. - N. W. and Atl. Prov.

8. Sisym'brium. L. Hedge Mustard

1. S. Officinale, Scop. (Hedge Mustard.) Flowers yellow, small. Leaves runcinate. Stem 1-2 feet high, with spreading branches. Pods awl-shaped, close pressed to the stem. - A very common roadside weed.

2. S. eanes'eens, Nutt. (Tansy-Mustard.) Flowers yellowish, very small. Leaves twice pinnatifid, hoary with short branching hairs, the divisions toothed. Pods acute at each end, shorter than the slender spreading pedicels. - N. W.

3. S. Sophia, L. Hoary. Leaves dissected into very numerous small leaflets. Pods very slender, about an inch long, ascending. - Scarce.

4. S. Sinapistrum, Crantz. Tall, branching. Loosely pubescent below, smooth above. Leaves deeply pinnatifid, the lobes narrowly linear. Pods very long (3-4 inches) and slender, spreading. - An introduced weed which has now become a pest in the North-West.

5. S. inci'sum, Engelm., var. Hartwegia'num, Watson, has pinnate leaves, the leaflets narrowly oblong and toothed. Pods only one-eighth to one-fourth of an inch -long, in a crowded raceme. - N.W.

9. Hes' Peris

Tourn. Rocket. H. matrona'lis, L. (Garden Rocket.) Tall, leaves lanceolate, acuminate, serrate, usually petiolate. Flowers large, purple. Pods 2-4 inches long, spreading. - Waste places.

10. Bras'sica. Tourn. Cabbage, Mustard, Etc

1. B. Sinapis'trum, Bois. (Charlock.) Flowers bright yellow. Stem 1-2 feet high, branching, it and the leaves hairy. - Too common in our grain fields.

2. B. ni'gra. (Black Mustard.) Flowers sulphur-yellow. Stem 3-6 feet high, round, smooth and branching. Lower leaves lyrate. - Fields and waste places.

2. B. campes'tris, L. Stem tall and erect, it and the leaves smooth. Lower leaves ovate or elliptical, coarsely toothed, on long petioles; upper ones narrow and sessile. Pods an inch long or more, on ascending pedicels; beak about 1/3 the length of the pod. - A common weed in Manitoba.

11. Diplotaxis, Dc

1. D. mura'lis, DC. Branching from near the base. Smooth or sparingly hispid. Leaves oblanceolate, shallowly and bluntly toothed or pinnatifid. Petals pale yellow. Pods over an inch long, on slender spreading pedicels half as long as the pods. Valves 1-nerved. - Ballast-heaps, Atl. Prov.

2. D. tenuifo'lia, DC. Like the last, but the leaves are deeply sinuate-pinnatijid, with narrow lobes. Pedicels of the pods over an inch long. - Ballast-heaps, Atl. Prov.

12. Draba. Dc. Whitlow-Grass

1. D. inea'na, L. Hoary - pubescent. Flowers white. Leaves lanceolate or oblanceolate to ovate, entire or sparingly toothed. Pods oblong to lanceolate, usually straight, on short erect pedicels. Style short or none. - Dry rocks.

Var. arab'isans, "Watson, has the pod glabrous, twisted, and tipped with a distinct style. - Rocks.

2. D. nemoro'sa, L. A small slender plant with leaves about 1/4 of an inch long. Flowers white. Leaves oblong, or somewhat lanceolate, hairy, sessile, serrate. Racemes elongated. Pods elliptical-oblong, half as long as the wide-spreading pedicels, pubescent or smooth. Style none. - N.W.

3. D. Carolinia'na, Walt. Flowers white. Stem 1-5 inches high. Leaves obovate, entire. Raceme very short. Pods broadly linear, smooth, longer than the ascending pedicels. Style none. - Rocks; Southern Ontario.

13. Alys'sum

Tourn. Alyssum. A. calyci'num, L. A dwarf hoary annual, with linear-spathulate leaves. Calyx persistent. Pod 4-seeded, sharp-edged. - Rather rare; abundant at Queenston Heights.

14. Camel'ina

Crantz. False Flax. C. sati'va, Crantz. (Common F. Flax. ) Flowers yellowish. Stem 1-2 feet high, straight, erect, branching. Leaves lanceolate, sagittate. Pods pear-shaped, large, margined; style slender. - In flax fields.

15. Neslia

L. Ball Mustard. N. paniculata, Desv. Flowers yellow, in small panicles. - A troublesome weed in Manitoba.

16. Capsel'la

Vent. Shepherd's Purse. C. Bursa-pasto'ris, Moench. Flowers small, white. Root-leaves clustered, pinnatifid; stem-leaves clasping, sagittate. - A very common weed.

17. Thlaspi. Tourn. Penntcress

T. arvense, L. (Field Pennycbess. French Weed.) A low smooth plant, with undivided radical leaves, and stem-leaves sagittate and clasping. Pods half an inch broad, deeply notched at the top. - Waste places: common N.W.

18. Lepid'ium. L. Peppergrass

1. L. Virgin'icum, L. (Wild P.) Flowers small; petals present, white. Stem 1-2 feet high. Leaves lanceolate, the upper linear or lanceolate and entire, the lower toothed or pinnatifid, tapering towards the base. Pods marginless or nearly so, oval or orbicular. - Railways and roadsides.

2. L. interme'dium, Gray. Distinguished from No. 1 by having the cotyledons incumbent instead of accumbent, and the pods minutely winged at the top. - Dry sandy fields.

3. L. rudera'le, L. Petals always absent. More branched than the preceding.

4. L. campestre, L. Well distinguished from other species by its sagittate, clasping leaves. Pods ovate, winged. - Rather rare.

5. L. sativum, L., has leaves variously divided and cut, with numerous roundish winged pods, and flowers white or rose-coloured. - Escaped from cultivation in some places.

6. L. Draba, L. An obscurely hoary perennial. Upper leaves auricled, lower sessile,' oblong. Pods heart-shaped, the style conspicuous. - Abundant about Clifton, Ont.

19. Senebie'ra. Dc. Wart-Cress. Swine-Cress

1. S. did'yma, Pers. Pods notched at the apex. - Atl. Prov.

2. S. corono'pus, DC. Pods not notched. - Atl. Prov.

20. Caki'le. Tourn. Sea-Rocket

C. America'na, Nutt. (American S.) Flowers purplish. Leaves obovate, fleshy, wavy-toothed. Pod fleshy, 2-jointed. - Seashore, and borders of the Great Lakes.

21. Raph'anus. Tourn. Radish

R. Raphanis'trum, L. (Wild Radish.) Pods linear or oblong, tapering, indehiscent, long-beaked, necklace-form when ripe. Style long. Cotyledons conduplicate. Leaves rough, lyrate. Petals yellow, veiny, turning whitish or. purplish. - An introduced weed; chiefly eastward.