CRUCIFERiE.
* Seeds immarginate or slightly margined.
L A. alpina (Linn.): stem branching, somewhat diffused, and, with the
leaves, clothed with a villous branched pubescence; leaves manv-toothed;
radical ones somewhat petioled ; cauline cordate, clasping; peduncles nearly
glabrous longer than the calyx Hook. jl. Bor.-Am. 1. p. 41; Bot. mag. t.
226, Pursh, jl. 2. p. 436; DC. prodr. 1. p. 142.
Labrador.—A native also of the north o f Europe.
2. A. hirsuta (Scop.): stem erect, toothed or somewhat entire, and, with
the stem, hirsute with a branched pubescence; radical ones oblong-ovate,
0I- f e?sl e ’ 'tauline ones oblong or lanceolate, somewhat clasping,
s yauricled at the base or sagittate; siliques numerous, erect.—DC.
r T v J ’ n Ur ’ BoI \ Am- L PA2> Cham- $ Schlecht. inLinnaa, ■ p. 15, Darlingt. f i . Cest. ed. 2. p. 382. A. sagittata, DC.prodr. 1. p. f ig .
Turntis hirsuta, Linn. T. oblongata, R a f. 1 *
0. glabrata: whole plant glabrous ; leaves mostly entire.
y. ovata: radical leaves spatulate, petioled; cauline ones ovate, partly
clasping, not auncled.—A. ovata, Pair. A. sagittata 0. ovata, DC. prodr. 1. c.
1 urntis ovata, Pursh ! fl. 2. p. 438. J
Rocky places, Canada! (lat. 68°) to Virginia; west to Oregon and Sitcha.
h'; J l ft011’ i C Scou[er ■ r-Hoboken, New Jersey !—® Stem about a foot
nigh, often glabrous above. Flowers greenish-white. Silique straight, 1-2
inches long, scarcely half a line wide ; stigma nearly sessile. Seeds with a
narrow margin.
^3. A. dentata: more or less rough with a stellate pubescence ; radical leaves ,
oboyate, tapering at the base into a petiole as long as the limb, irregularly
dentate with sharp salient teeth; cauline ones oblong, clasping; flowers mi-
nu e , petals spatulate, scarcely longer than the calyx; siliques short, spread-
mg, on very narrow pedicels, pointed with the nearly sessile stigma; stem
branched from the base.—Sisymbrium dentatum, Torr.! in Short’s 3rd
suppl. cat. pi. Kentucky.
Sandy banks of the Ohio ! Missouri ! Mississippi! and Arkansas. April.—
® riant 1-21 feet high; the pubescence (particularly of the under surface of
the leaves) short and rather scabrous. Stem slender, sometimes decumbent
at the base. Radical leaves 2 i inches long, and three-fourths of an inch
/ v u . owef.s scar,cely ^ lines long. Sepals hirsute. Petals dusky white
(with a tinge of purple, Nutt.'). Anthers ovate-oblong. Silique an inch long,
not a line m breadth; valves somewhat convex. Seedsr slightly margined.
Radicle long and slender, distant from the accumbent cotyledons.
■ 4' A-'jjri'cta- (Huds.) : radical leaves oblong, attenuate at the base, lyrately
pmnatind, hispid with spreading hairs ; cauline ones few, lanceolate, somewhat
attenuate at the base > petals oblong, erect, obtuse, twice the length of .
the glabrous calyx; siliques elongated, erect. Hook.—Pursh, fl. 2. p. 437;
Hook.fi. Bor.-Am. l.p . 42. 1
Labrador.— 2( A native also of Europe.
5. A.petrma (Lam.): stem nearly erect, sometimes branched, glabrous;
radical leaves petioled, incised or pinnatifid; cauline ones oblong-linear, en-
ooi ’ 0 ,vate’ unguiculate ; siliques erect-spreading.—Lam. diet. 1. p.
£ C . prodr. l.p . 145; Hook. fl. Bor.-Am. l.p . 42 (excl. syn.); Cham.
<y Schlecht. in Linncea, l.p . 15. 1 |
On rocks; Canada to Arctic America, and N. W. Coast. Shore of Lake
Superior, Dr. Pitcher /—If Stems 3-9 inches high. Cauline leaves few.
b lowers white or lilac. Style very short or none.—Habit of Arabia lyrata,
from which it differs m its perfectly accumbent cotyledons and perenniai
6. A. ambigua (D C ): leaves nearly glabrous, the radical ones sinuatelyrate;
middle ones oblong-oval and toothed, attenuate at the base; the uppermost
linear-oblong and entire; stem nearly simple; siliques somewhat
erect .—DC. syst. -2. p. 231; Cham, f Schlecht. in Lnnnata, 1. p. 16; Hook,
fl. Bor.-Am. 1. p. 42. ,
Unalaschka, Sitcha! and Kotzebue’s Sound.—® Stems numerous from
one root, a foot or more high, ascending. Radical leaves with a few simple
hairs; cauline ones very glabrous. Racemes few-flowered; the flowers
smaller than in the preceding species. Silique two inches long and nearly a
line broad, pointed with the nearly sessile stigma. Seeds without a border;
the cotyledons distinctly accumbent.
7. A lyrata (Linn.) : stem branching from the base; radical leaves
lyrate-pinnatifid and somewhat hirsute; cauline ones linear, entire, and
with the stem glabrous ; siliques erect, nearly straight; radicle slightly dor-
safe— 2. p. 437 ; DC. prodr. 1. p. 146. Sisymbrium arabidoides,
Hook.! fl. Bor-Am. 1. p. 63. t. 1 ; Darlingt. fl. Cest. ed. 2. p. 387.
On rocks, Canada ! to Virginia! April-May.—© Stem 4 -1 2 inches high,
at first erect, but at length diffuse. Radical leaves rosulate in the young
plant; the segments usually obtuse, often toothed. Flowers as large as in
A. petrsea, white. Mature siliques 1J-2 inches long, scarcely more than
half a line broad, pointed with a short style. Seeds without a border. Cotyledons
flat, ovate; the radicle lying along the edge of one of them, so as to
be nearly accumbentij-j-Our exceEent friend Sir William J. Hooker refers
this plant to Sisymbrium ; but we retain it in Arabis, because, on a careful
examination of numerous ripe seeds, we find the radicle so slightly dorsal
that the cotyledons may be regarded as accumbent. We have never seen
the seeds so evidently incumbent as they are represented in Hooker’s figure.
8. A. rumestris (Nutt.! mss.): “more or less hirsute ; radical leaves ob-
long-spatuiate; cauline ones lanceolate, clasping, sparingly toothed ; petals
twice as long as the calyx; silique very long and narrow, erect-spreading.
“ On rocks near the banks of the Oregon.—© Plant 1J-2 feet high ; the
pubescence simple or forked : upper part of the stem nearly smooth. Cauline
leaves clasping, but not sagittate. Siliques about 3 inches long, less than a
line in breadth. Seeds slightly margined.” Nutt.—Near A. saxatilis.
9. A. spathulata (Nutt.! mss.): “ hirsute (dwarf and somewhat caespitose);
leaves spatulate-oblong, entire; cauline ones clasping, petals roundish,
spreading, about twice the length of the calyx; siliques rather short, diverging,
pointed with a distinct slender style.
“ Lofty dry hills of the Platte, from the Black Mountains to the central
chain. May.—2( About 4 inches high. Root thick, crowned with vestiges
of former leaves and stems. Radical leaves on rather long petioles. Flowers
white, somewhat conspicuous. Pedicel about half the length of the
fruit. Silique scarcely half an inch long and nearly a line in breath ; cells
7-10-seeded.” Nutt. Seed oblong, with a narrow margin. Funiculus long
and slender, free.—Near A. serpyllifolia of Europe.
10. A. heterophylla (Nutt, mss.) : “ nearly smooth; radical leaves spatulate,
toothed; upper ones linear, sessile, entire; silique long and spreading ;
petals linear-oblong, exceeding the calyx.
“ Near Paris, Maine? or in the vicinity of the White Mountains of New-
Hanlpshjre.—© Radical leaves somewhat pilose with simple hairs; upper
ones linear, about 2 inches in length and a line or two in breadth. Siliques
about 3 inches long.” Nutt.—W e have seen no specimens of this plant.
11. A. sparsifiora (Nutt, mss.): “ somewhat pilose towards the base,
much branched; cauline leaves oblong, clasping, entire ; flowers minute;
siliques very long, flat, spreading.