ed ; the terminal one much larger and somewhat orbicular. Racemes 4-10-
m the young plant’ or in dwarf specimens, on long
te rm in g 01 scape? ’ ln . the advanced state on racemes which
nr Z p In l,! ^ r fircUrgent bra“ches- Pedicels without bracts, an inch
i Z H f ! 1’ fihforrn! sPreadmg and curved upward. Sepals rather
n Z ’Z n Z °e ’ 7 , ged Wlth1PurPle- Petsds golden yellow, tapering into
a long cuneate base. Filaments slender : anthers oblong. Style short, but
conspicuous. Silique rather more than an inch long and nearly two lines
m breadth shghtiy torulose, rather convex : septum very thin and transpa-
!??*• jach CT> susPended on short rigid funiculi, approximated
so that their broad membranaceous margins somewhat overlap. Embryo
nearly straight from the earliest to the most advanced state. Radicle pbint-
matiZtowards^f mclmed fr0m the Mumi but afterwards gradually approxi-
2. L . Michauxii (Torr.): style almost none; radicle oblique. Torr. !
syst 2 p d25ine Unlbora’ Mxchx- '■ ft- 2- P- 29; Pursh, ft. 2. p. 439; DC.
. 9 “ about Knoxville, Tennessee, Michaux! and on wet rocks, Kentucky,
Short . —Greatly resembling the preceding species, but easily dis-
tmguished by its nearly sessile stigma. The difference in the direction of
the radicle seems also to be constant. Michaux states that the peduncles are
radical and one-flowered, but the specimens in his herbarium are caulescent;
the racemes terminating short assurgent branches, and the pedicels being
greatly elongated, so as to resemble scapes. 8
T ribe II. SISYMBREiE. DC.
Silique longitudinally dehiscent; valves nearly plane, or somewhat
tere e and carinate : septum linear. Cotyledons plane, incumbent
( o ||), contrary to (i. e. with their edges towards) the septum. Seeds
not bordered.
12. HESPERIS. L in n .; DC. syst. 2. p. 446.
Silique nearly terete, or 4-sided and somewhat compressed. Stigmas 2
erect, connivent. Inner sepals saccate at the base. Seeds somewhat 3-sided!
Stamens toothless.—Rocket.
Z ' Z i L}nn-)■ stem erect, nearly simple; leaves ovate-lanceolate,
toothed, pedicels as long as the calyx; petals obovate, siliques glabrous,
torose erect margpn not thickened (flowers white or rose-color). DC.
prodr. l.p . 189; Hook. ft. Bor-Am. l.p . 59
Shores of Lake Huron, Dr. Todd, (fide fibofc.)—Doubtless introduced.
2. H. minima: pubescent with appressed 2-parted hairs; leaves linear-
lanceolate, attenuate at the base; siliques numerous, erect, compressed nu-
bescent; stem erect, simple. Hook.-H. pygmaea, Hook. ft. Bor.-Am.’I p .
13T fide Hook°f Dehl^ Cbelranthus PYgmseus, Adams; DC. prodr. 1. p.
Arctic America Kotzebue’s Sound.—® Root fusiform. Stem in fruit a
span high, a little flexuous. Leaves mostly radical; entire or sinuate-toothed
Corymb many-flowered, racemose in fruit. Petals large, obovate purple*
Stigma 2-lobed. Siliques linear-ensiform, slightly falcate, pale purple.
Hook.—Sir William Hooker is inclined to refer to this species Cheiranthus
Pallassii, Pursh, which is described as having rather terete siliques and a
subcapitate stigma. If his suspicion is confirmed, Pursh’s specific name must
be adopted.
3. H. Menziesii (Hook.): leaves spatulate, fleshy, covered with an appressed
2-parted pubescence; siliques (young) spreading; stem very short,
erect, simple. Hook. ft. Bor.-Am. 1. p. 60.
California.—Root perennial, ligneous. Flowers larger than in the preceding
species, purple 1 Hook.
13. SISYMBRIUM. Allioni; DC. syst. 2. p. 458.
Silique somewhat terete. Stigmas 2, somewhat distinct, or connate and
capitate, Sepals equal at the base. Seeds ovate or oblong. Cotyledons
sometimes oblique.
§ 1. Siliques subulate, terminated with a short s ty le : pedicels very
short, thickened and appressed to the a xis after flowering.—V elarum,
DC.
1. S. officinale (Scop.): leaves runcinate, and, with the stem, hairy,
flowers very small (yellow). DC. prodr. 1. p. 191; Hook. ft. Bor .-Am. 2.
p. 61. , Erysimum officinale, Lin n . ; Pursh, ft. 2. p. 436; Ell. sk. 2. p. 148.
Road-sides and waste places, Canada! to Georgia; Oregon. May-Aug.
Introduced.—® Stem 1-3 feet high. Racemes elonga.ted, curved in fruit.
Petals cuneate, longer than the calyx. Siliques 6-10 fines long, attenuate
into a short style.
§ 2. Siliques terete: style very short: calyx spreading or erect: seeds
oblong.—Norta, DC.
2. S. junceum (Bieb.): leaves glabrous, glaucous; the lower ones petioled,
runcinately pinnatifid ; upper ones linear-lanceolate, entire. DC. prodr. 1.
p. 191; Hook.ft. Bor.-Am: l . p 61. .
Dry stony places on the Oregon, Douglas, and Rocky Mountains towards
the source of Salmon River, Mr. Wyeth, (fide Nutt.) Apparently identical
with the European plant. Nutt.
3. S. linifolium (Nutt.! mss.) : glabrous; stem slender, simple; leaves
linear, undivided, the lower ones somewhat laciniately cleft (flowers large);
petals nearly twice as long as the calyx; siliques linear and narrow.—Nasturtium
linifolium, Nutt. ! in jour. acad. Philad. 7. p. 12.
Plains of the Rocky Mountain range, towards the head-waters of the
Platte, Mr. Wyeth! May—If Stem 8-12 inches high. Leaves all narrow,
not glaucous: the axils often leafy. Silique about 2 inches long.—Very
near the preceding, but the flowers and siliques are larger.
4. & pygmcBum (Nutt.! mss.): dwarf, nearly smooth ; stem somewhat simple
; lower leaves somewhat lyrately pinnatifid, oblong; upper ones entire,
linear; petals longer than the calyx; silique long and narrow.—Nasturtium
pumilum, N u tt.! 1. c. .
Head waters of the Missouri, in dry soils. Flowering early in the spring.—
ft Stem 3 inches high, slightly pubescent. Leaves attenuated at the base
into a petiole ; terminal segment rounded and obtuse. Flowers about 3 lines
long, in short racemes.