SESLANIA-SIUM. 139 
SESLANIA, 1&— 10. (LeguminosfB.) 
vesica'ria, (y. Au.) leaves pinnate ; leafets oblong, ob.'use, glabrous ; racemes 
shorter than the leaves. 5-7 f. ^S. 
SESUVIUM. 11—5. iFicoidecB.) 
sessi'le, (r. Ju.) flowers sessile ; leaves linear-oblong, flat. Stem succulent. 
Sea-coast, 
SEYMERIA. 13-2. iScrophularim.) 
tenuifo'lia, (y-p. Au. glabrous, very branching; leaves compound-pinna- 
tifid ; segments filiform, opposite and alternate ; corolla subrotate. 3-4 f. S. 
pectina'ia^ leaves pectin ate-pinnatifid, 
SICYOS. 19—15. (CucurbitacecB.) [From the Greek si/twos, a cucumber.] 
angula'ta, (single-seed cucumber, w, ©.) leaves cordate, back lobes obtuse. 
5-angled, scabrous, denticulate; tendrils umbellate ; steril flowers corymb- 
ose-capitate, with the common peduncle long ; fertile flowers sessile ; fruit 
small, ovate, hispid. 
SIDA. 15—12. (MalvacecD.) [Origin of the name doubtful.] 
abu'tilo?i, (Indian mallows, y. Ju. leaves round-cordate, acuminate, tooth- 
ed, tomentose; peduncles solitary, shorter than the petioles; capsule 2-awn- 
ed, truncate. 4-6 f. 
i^SJLENE. 10—3. iCaryophyllecB.) 
pennsylva'nica, (pink-catchfly, p. M. J. '2]..) viscidly pubescent; radical leaves 
wedge-form ; stem leaves lanceolate ; panicles trichotomous ; petals slightly 
emarginate, very obtuse, sub-crenate. 8-12 i. 
virgin'ica, (r. J. %.') erect, or decumbent; viscidly pubescent ; leaves lance- 
oblong, scabrous on the margin ; panicle dichotomous ; petals bifid; stamens 
exsert. 12 i. 
antirrhi'na, branches and peduncles very erect ; calyx broad-oval, shining ; blos- 
soms nocturnal ; corolla small, whitish. Dry hills. 
injia'ta, calyx bladder-like, and beautifully veined; flowers white, petals bifid. 
Bladder campion. Rocky hills. Ex. 
cmeVia, (w-r. Au. ©.) flow^ers fascicled, fastigiate ; upper leaves cordate, 
glabrous ; petals entire. Ex. 
co'nica, calyx of the fruit conic, striate. Ex. 
dichot'oma, racemes in pairs, terminal, 1-sided ; flowers intermediate, pedun- 
cled. Ex. 
SILPHIUM. 17—4. CCorymbifercR.) 
perfolia'lum, (ragged-cup, y. Au. %.) stem 4-angled, smooth, leaves opposite, 
connate, ovate, serrate. 6 f. Rays 24. Mountains. 
irifolia'tum, leaves verticillate by threes ; panicle trichotomous; stem 4-6 f. 
high, mostly purple ; ray florets about 14, long, bright yellow. 
SINAPIS. 14—2. iCrucifercB.) 
ni'gra, (common mustard, y. J. ©.) silique glabrous, 4-angled, close pressed 
to the stem; leaves at the top lance-linear, entire, smooth. Naturalized. 
aV^ba, (white mustard,) pod mostly hispid, spreading; flowers corymbose. 1-2 
feet. Introduced. 
SYSYMBRIUM. 14—2. iCrucifercB.') [From siswfios, fringe ; so called from its fringed roots.] 
oJJicm"ale, (y. Ju. ©.) leaves runcinate. hairy; flowers jn a long raceme ; pod 
subulate. 1-2 f. Stem hairy, branched. Road-sides. 
' SISYRINCHIUM. 15—3. {Irideai.) 
_ an"ceps, (blue-eyed grass, b. J. %.) scape or culm simple, 2-edged or 2- winged ; 
glume-like spatha of 2 unequal valves, extending above the flower ; petals, 
mucronate. Hedge-mustard. 6-12 i. 
mucrona'tum, scape simple, winged ; spatha coloured, one of the valves end- 
ing in a long, rigid point ; stem setaceous, 6-10 i. .Flowers 3-4 in a spatha, 
blue. 
SIUM. 5—2. ( Umbellifercb.) [Fromseio, to move ; from its agitation in the water.] 
latifo'lium, (water-parsnip, w. Ju. %.) root creeping; stem erect, angular; 
leaves pinnate; leafets ovate, lanceolate, sessile, smooth, serrate, sometimes 
