rate; root fibrous ; petals longer than the calyx ; silique ellipsoid, spreading
mucronate with the style. DC. prodr. 1. p. 138; Hook. ft. Bor.-Am.l.p.
U9. bisymbnum amphibium, Linn, ƒ Pursh, fl. 2. p. 440.
Watery places; Canada, Hooker; Pennsylvania to Virginia Pursh.—
Stems suleate, sparingly branched. Emersed leaves serrate, often pubescent;
immersed ones more or less pinnately lobed, sometimes pectinately capillace-
ous. Racemes dense, elongated. Peduncles spreading, at length reflexed,
twice as long as the silique. Silique oblong-ovate, attenuate at the base,
pointed with the short style. DC.—We have seen no N. American specimens
that accord with the description of this plant. The N. amphibium o f
some ol our botanists is probably only a variety of N. palustre.
9. N. polymorphum (Nutt.! mss.): “ leaves deeply pinnatifid or almost
entire ; segments entire; petals scarcely longer than the calyx; silique oblong
linear, compressed; stigma minute, nearly sessile.
v- Banks of the Oregon.—(T) or © Stem about a span high. Leaves rattier
narrow ; the segments short, linear, and acute. Branches from the root,
alter the developement of the stem and fruit, or. shoots from a cropped stem,
produce leaves either entire or with a few pinnatifid incisions. At other
tunes the whole plant bears similar leaves. Flowers small.” Nutt.
10. N. obtusum (Nutt.! mss.) : “leaves pinnately divided, decurrent;. segments
irregularly oval, angularly toothed, obtuse; siliques linear, subterete
twice the length of the pedicels; style short.
“ Banks of the Mississipsi.—(4) Stem branching above. Racemes lateral
and terminal, elongated in fruit.” Nutt.
11. N. limosum (Nutt.! mss.): “ leaves lanceolate, Iaeiniately pinnatifid
towards the base, nearly entire above or merely angularly toothed; laciniae
decurrent, subserrate or entire ; pedicels much shorter than the abbreviated
siliques; stigma nearly sessile.
“ Banks of the Mississippi, near New-Orleans.—© Subaquatie. Habit of
N. palustre. Very smooth. Leaves irregularly but not deeply divided, except
where they approach the water.” Nutt.
12. N. hispidum (DC.) : stem (tall) tomentose-villous; leaves somewhat
villous, runcinate-pinnatifid; lobes rather obtusely toothed; siliques (minute)
ovate, tumid, pointed with the distinct style, scarcely more than half as
long as the somewhat spreading pedicels; petals scarcely as long as the
calyx.—DC. syst. 2. p. 201. Sisymbrium hispidum, Poir.enc. 5. p. 161.
Near Middletown, Connecticut, Dr. B a r ra tt! Pennsylvania, Poiret *
Middle and Northern States, Nuttall.— ? Stem 2 -3 feet high, much branched
above, almost hispidly villous, angular, erect. Leaves 3-6 inches long;
lobes numerous, ovate. Racemes numerous, panicled. Flowers minute.
Sepals oblong, obtuse. Petals obovate. Silique scarcely more than a line
long, exactly ovate, somewhat compressed. Style nearly half the length of
the fruit: stigma capitate. Pedicel 2-3 lines long.—A very distinct species,
remarkable for its villous stem, and very small ovate siliques.
13. N. sylvestre (R. Brown) : leaves pinnately divided, segments lanceolate,
serrate or incised; petals longer than the calyx; siliques oblong, somewhat
torulose; style very short. DC. syst. 2. p. 190. Sisymbrium sylvestre,
Linn. sp. 916. S. vulgare, Pers. syn. 2. p. 196; Nutt. gen. 2. p. 68.
Banks of the Delaware near Philadelphia, Nuttall — Introduced.
14. N. cernuum (Nutt.! mss.): “ racemes panicled (flowers white);
leaves pinnatifid or laciniate, the segments irregularly and distantly toothed ;
silique short, obovate, nodding; stigma sessile.
. “ Ponds of Wappatoo Island at the junction of the Wahlamet with the
Oregon.—Stem thick and stout. Petals exserted, rather narrow. Pedicels
more than twice the length of the fruit.—Allied to N. amphibium, but destitute
of a style, the fruit is not elliptical, and the leaves are more divided.”-
Nutt.
15. N. natans (D C .): emersed leaves oblong-linear, entire; immersed ones
manv-parted with capillary segments ; petals scarcely longer than the calyx;
siliques obovate-globose. DC. syst. 2. p. 198 ; Deless. ic. 2. 15.
p. Americanum (Gray) : emersed leaves serrate; petals (white) twice as
long as the calyx; siliques obovate; style as long as the ovary, and halt as
long as the fruit.—G ra y ! in ann. lyc. New-York, 3. p. 223. N. natans,
Hook. fl. Bor.-Am. l.p . 39; Beck, bot.p. 32. .
y. brevistylum: emersed leaves oblong-lanceolate, denticulate-serrate; style
much shorter than the ovary. . , M) , , f
0 In water; Canada, Dr. Holmes ! Oneida Lake, Gray! Ogdensburgh,
New-York, Dr. Crawe! Pekin, Illinois, Mr. Buckley! y. near New-
Orleans, Dr. Ingalls ! July.—Stem 2-5 feet long, according to the depth ot
the water. Submersed leaves deciduous. Flowers more than twice as large
as in N. palustre. Silicle more than 2 lines in length, sometimes obovate-
dblong. Style slender; stigma capitate.—It is quite possible that the American
plant is distinct from the Siberian species, which we know'only Irom
the description of De Candolle and the figure of Delessert, and which is said
to have yellow flowers, smaller than those of N. amphibium, and petals
scarcely longer than the calyx; whereas the petals are pure white in our
plant, about twice the length of the calyx, and the flowers twice as large as
3. BARBAREA. R. Br. in hort. Kew. (ed. 2.) 4. p. 109; DC. syst.
2. p. 205.
Silique ancipital or 4-sided; valves concave-carinate. Seeds in a single series.
Sepals equal at the base.—Leaves lyrately pinnatifid. Flowers yellow.
1. B. vulgaris (R. Brown) : lower leaves lyrate, the terminal lobe roundish
; upper ones obovate, toothed or pinnatifid at the base; silique 4-sided,
with the sides somewhat convex, acuminate with the style.—DC. prodr. l.p.
140; Hook. fl. Bor.-Am,. 1. p. 39. B. arcuata, Bong, in mem. acad. St.
Petersb. (6. ser.) 2.p. 124. ErysimumBarbarea, Lin n . ; Cham. <$■ Schlecht.
in Linncea, 1. p. 15.
#. gracilis (DC.) : stem slender, nearly simple.
Along streams and road sides; common in the Northern States! and apparently
introduced. Oregon and N. W. America; Sitcha, Bongard. P- Oregon,
Nuttall. May-June.—One to two feet high, glabrous, branching in a
paniculate manner. Flowers in dense racemes.—Mr. Nuttall thinks that the
var. P. is a distinct species, which he calls B. gracilis.
2. B. proecox (R. Brown): lower leaves lyrate, the terminal lobe obovate
ptipper ones pinnatifid, with linear-oblong lobes; siliques linear, elongated,
compressed-ancipital; style very short and thick—DC. prodr. 1. p. 141;
Hook.! Jl. Bor.-Am. 1. p. 39. E. prsecox, Smith.
Banks of rivers, Canada to lat. 68°!—Stigma nearly as broad as the valve.
Siliques 2-3 inches long.—Resembles the preceding, but more slender. The
flowers are also smaller, and the siliques longer.
4. STR E PTA N TH U S . Nutt, in jour. acad. Philad. 5. p. 134.
Silique.very long, compressed or somewhat quadrangular: style short or
none. Seeds in a single series, flat, margined. Sepals erect, colored. Claws
of the petals canaliculate, usually twisted Filaments subulate (those of each